Paul Ardeleanu, profile picture
Uploaded byPaul Ardeleanu
1,946 views

iOS Developer Overview - DevWeek 2014

The document provides an overview of iOS application development, targeting developers with minimal exposure to the platform. It covers essential topics such as tools, programming with Objective-C, design patterns, and the importance of user experience. Furthermore, it highlights the need for building efficient apps that solve real user problems through various development concepts like MVC architecture and notifications.

Embed presentation

Downloaded 54 times
1 / 196
2 / 196
3 / 196
4 / 196
5 / 196
6 / 196
7 / 196
8 / 196
9 / 196
10 / 196
11 / 196
12 / 196
13 / 196
14 / 196
15 / 196
16 / 196
17 / 196
18 / 196
19 / 196
20 / 196
21 / 196
22 / 196
23 / 196
24 / 196
25 / 196
26 / 196
27 / 196
28 / 196
29 / 196
30 / 196
31 / 196
32 / 196
33 / 196
34 / 196
35 / 196
36 / 196
37 / 196
38 / 196
39 / 196
40 / 196
41 / 196
42 / 196
43 / 196
44 / 196
45 / 196
46 / 196
47 / 196
48 / 196
49 / 196
50 / 196
51 / 196
52 / 196
53 / 196
54 / 196
55 / 196
56 / 196
57 / 196
58 / 196
59 / 196
60 / 196
61 / 196
62 / 196
63 / 196
64 / 196
65 / 196
66 / 196
67 / 196
68 / 196
69 / 196
70 / 196
71 / 196
72 / 196
73 / 196
74 / 196
75 / 196
76 / 196
77 / 196
78 / 196
79 / 196
80 / 196
81 / 196
82 / 196
83 / 196
84 / 196
85 / 196
86 / 196
87 / 196
88 / 196
89 / 196
90 / 196
91 / 196
92 / 196
93 / 196
94 / 196
95 / 196
96 / 196
97 / 196
98 / 196
99 / 196
100 / 196
101 / 196
102 / 196
103 / 196
104 / 196
105 / 196
106 / 196
107 / 196
108 / 196
109 / 196
110 / 196
111 / 196
112 / 196
113 / 196
114 / 196
115 / 196
116 / 196
117 / 196
118 / 196
119 / 196
120 / 196
121 / 196
122 / 196
123 / 196
124 / 196
125 / 196
126 / 196
127 / 196
128 / 196
129 / 196
130 / 196
131 / 196
132 / 196
133 / 196
134 / 196
135 / 196
136 / 196
137 / 196
138 / 196
139 / 196
140 / 196
141 / 196
142 / 196
143 / 196
144 / 196
145 / 196
146 / 196
147 / 196
148 / 196
149 / 196
150 / 196
151 / 196
152 / 196
153 / 196
154 / 196
155 / 196
156 / 196
157 / 196
158 / 196
159 / 196
160 / 196
161 / 196
162 / 196
163 / 196
164 / 196
165 / 196
166 / 196
167 / 196
168 / 196
169 / 196
170 / 196
171 / 196
172 / 196
173 / 196
174 / 196
175 / 196
176 / 196
177 / 196
178 / 196
179 / 196
180 / 196
181 / 196
182 / 196
183 / 196
184 / 196
185 / 196
186 / 196
187 / 196
188 / 196
189 / 196
190 / 196
191 / 196
192 / 196
193 / 196
194 / 196
195 / 196
196 / 196
iOS Application Development iOS Developer Overview Paul Ardeleanu
Assumptions… You are: ‣ a developer of sorts… ‣ have no or little exposure to iOS ‣ want to learn enough to become ‘dangerous’
The plan ‣ Why iOS? ‣ Tools ‣ Storyboarding ‣ Objective-C ‣ Design patterns ‣ Debug & Testing ‣ Ad-Hoc distribution ‣ Publishing in the app store
iOS Application Development Why iOS?
iOS Application Development Once upon a time…
… there were phones http://www.flickr.com/photos/adrianblack/371301544/
Then the iPhone happened…
Before & after https://twitter.com/JoshHelfferich
App Store
Global Phone Market Units shipped / quarter © Asymco - used with permission
Smartphone shipments © Asymco - used with permission
© Asymco - used with permission
iOS Application Development Developer tools
Developer tools
Xcode
Xcode
iOS Simulator
Instruments
Instruments
CocoaPods.org
CocoaPods.org
Reveal
Documentation
Documentation
Documentation
Dash
Dash
Dash
iOS Application Development Building great apps
Building great apps ‣ Constraints ‣ small size ‣ limited hardware ‣ one screen at a time ‣ one application at a time * ‣ touch input ‣ Interaction ‣ gestures ‣ shake ‣ orientation ‣ audio switch, volume buttons ‣ home & power buttons
List of features too many features? Filter Yes Application Definition Statement App features User journeys Wirefames Prototype
Application Definition Statement “A concise, concrete declaration of the app’s main purpose and its intended audience.” https://developer.apple.com/library/ios/documentation/ UserExperience/Conceptual/MobileHIG/
Solve real problems "An app must solve a user's problem clearly and elegantly." Eric Hope, User Experience Evangelist, Apple
Delivery channels ‣ web app [dedicated] ‣ native app ‣ “hybrid” solutions
iOS Application Development Storyboarding
What is Storyboarding ‣ Design the “screens” that compose your app => scenes ‣ Visually define the navigation between the scenes => segues ‣ Introduced in: iOS 5 & Xcode 4.2
Xcode 5 - default
Xcode 4 - optional
Main Storyboard
A simple app
Specialised View Controllers ‣ UITableViewController ‣ UINavigationController ‣ UITabBarController ‣ UICollectionView
UITableViewController
UINavigationController
UITabBarController
UIToolbar
UICollectionView
iOS 6 & 7
iPhone 3.5 vs 4-inch
iOS Application Development Objective-C
What is Objective C ‣ Thin layer on top of C; strict superset of C ‣ Object-oriented programming language ‣ Inspired by SmallTalk ‣ Developed by Stepstone / NeXT Software / Apple ‣ The development language for Mac OSX & iOS devices
Object-Oriented Programming a programming paradigm that uses "objects" ! myCar • Number of wheels • Number of seats • Colour • Engine size • Top speed • Drive • Brake • Turn Left • Beep • Fill with petrol MethodsProperties Data + Behaviour
Vehicle class Interface .h Implementation .m Vehicle.h Vehicle.m @interface  Vehicle  {     int  wheels;         int  seats;       }   ! -­‐  (void)drive;   -­‐  (void)setWheels:(int)n;   ! @end #import  "Vehicle.h"   ! @implementation  Vehicle   ! -­‐  (void)setWheels:(int)n  {     wheels  =  n;       }   ! -­‐  (void)drive  {     …       }   ! @end
Methods syntax -­‐  (void)setWheels:(int)n; return type name argument type argument name type
Multiple arguments -­‐  (BOOL)application:(UIApplication  *)application   didFinishLaunchingWithOptions:(NSDictionary  *)launchOptions application:didFinishLaunchingWithOptions: The name of the method is:
Multiple arguments + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion; + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations;
Multiple arguments [UIView animateWithDuration:1.0 delay:0.3 options:UIViewAnimationOptionCurveEaseIn animations:^{ // animations } completion:^(BOOL finished) { // completion block } ]; + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;
Properties @implementation  Vehicle   ! -­‐  (int)wheels  {     return  wheels;       }   ! -­‐  (void)setWheels:(int)n  {     wheels  =  n;       }   ! @end @interface  Vehicle  :  NSObject  {     int  wheels;       }   ! -­‐  (int)wheels;   -­‐  (void)setWheels:(int)n;   ! @end @implementation  Vehicle   ! ! ! @end @interface  Vehicle  :  NSObject  {   ! }   ! @property  int  noWheels;   ! @end   int  numberWheels;     @synthesize  numberWheels;
Properties & dot notation Vehicle  *myCar  =  [Vehicle  new];   ! myCar.wheels  =  5;   ! myCar.wheels  
What is a method? typedef  struct  objc_selector  *SEL; ! Vehicle  *myCar  =  [Vehicle  new];   ! [myCar  drive]; objc_msgSend(myCar,  @selector(drive))
Sending a message -­‐  (void)setWheels:  (int)n; [myCar  setWheels:4]; objc_msgSend(myCar,  @selector(setWheels:),  4);
Sending a message ! Vehicle  *myCar  =  nil;   ! [myCar  drive];   myCar  =  ...;             if  ([myCar  respondsToSelector:@selector(drive)])  {        [myCar  drive];       }  
Initialisers Vehicle *myCar = [Vehicle new]; -­‐  (id)initWithWheels:(int)wheels  {     self  =  [super  init];         if  (nil  !=  self)  {          //  Custom  initialization          self.wheels  =  wheels;         }         return  self;       } Vehicle *myCar = [[Vehicle alloc] initWithWheels:4]; Vehicle *myCar = [[Vehicle alloc] init];
InitialisersMultiple @interface  Vehicle  :  NSObject   ! @property  int  wheels;   @property  int  seats;   ! -­‐  (id)initWithWheels:(int)wheels  andSeats:(int)seats;   -­‐  (id)initWithWheels:(int)wheels;   -­‐  (id)initWithSeats:(int)seats;   ! @end
InitialisersMultiple -­‐  (id)init  {     return  [self  initWithWheels:DefaultNumberWheels  andSeats:DefaultNumberSeats];       }   #define  DefaultNumberWheels  4   #define  DefaultNumberSeats  5 -­‐  (id)initWithWheels:(int)wheels  andSeats:(int)seats{     self  =  [super  init];         if  (nil  !=  self)  {       self.wheels  =  wheels;   self.seats  =  seats;     }         return  self;       } -­‐  (id)initWithWheels:(int)wheels  {     return  [self  initWithWheels:wheels  andSeats:                                    ];       } -­‐  (id)initWithNumberSeats:(int)seats  {     return  [self  initWithWheels:DefaultNumberWheels  andSeats:seats];       } DefaultNumberSeats
Inheritance @interface  Truck  :  Vehicle     ! ! ! ! ! ! ! ! ! ! ! @end   @interface  Vehicle  :  NSObject     ! @property  int  wheels;   @property  int  seats;   ! -­‐  (void)drive;   ! @end -­‐  (void)checkLoad;   -­‐  (void)loadWithWeight:(int)weight;   -­‐  (void)unload;                                                      {     int  maxWeight;       } @property  int  currentWeight;
Inheritance NSObject NSPredicateNSArray NSComparisonPredicate NSMutableArray UIResponder UIView UIWindow UIControl UIButton UIGestureRecognizer UIApplicationNSNumber NSValue
instance class isa superclass superclass metaclass isa metaclass isa superclass NSObject superclass superclass nil metaclass isa superclass superclass
Polymorphism & Dynamic typing Vehicle Truck ! - (void)drive Car ! - (void)drive id  aVehicle;   ! ...   ! [aVehicle  drive];
id ‣ the generic object type ‣ can be used for object of any type ‣ the object class is determined at runtime (dynamic typing) Vehicle  *aCar; Static typing id  aCar; Dynamic typing
Introspection NSObject - (BOOL)isKindOfClass:(Class)aClass; - (BOOL)isMemberOfClass:(Class)aClass; - (Class)superclass; - (Class)class; - (BOOL)respondsToSelector:(SEL)aSelector;
Protocols -­‐  (void)load;   -­‐  (void)unload;   -­‐  (float)getWeight; @interface  Truck  :  Vehicle @end
Protocols -­‐  (void)load;   -­‐  (void)unload;   -­‐  (float)getWeight; @implementation  Truck   ! ! ! ! ! ! ! ! ! ! ! ! ! @end -­‐  (void)load  {     ...       }   -­‐  (void)unload  {     ...       }   -­‐  (float)getWeight  {     ...       }   @interface  Truck  :  Vehicle @end
Protocols -­‐  (void)load;   -­‐  (void)unload;   -­‐  (float)getWeight; @interface  Truck  :  Vehicle @end @protocol  VehicleLoading @end <VehicleLoading>
Protocols -­‐  (void)load;   -­‐  (void)unload;   -­‐  (float)getWeight; @interface  Truck  :  Vehicle @end @protocol  VehicleLoading @end <VehicleLoading> @implementation  Truck   ! ! ! ! ! ! ! ! ! ! ! ! ! @end -­‐  (void)load  {     ...         }   -­‐  (void)unload  {     ...         }   -­‐  (float)getWeight  {     ...         }  
Category @interface  Vehicle  :  NSObject     ! ...   ! -­‐  (void)drive;   -­‐  (void)brake;   ! @end ! Vehicle  *myCar  =  [Vehicle  new];   [myCar  steerLeft];
Category @interface NSString : NSObject ! ! ! ! ! ! @end
@interface NSString : NSObject ! ! ! ! ! ! @end Category - (NSUInteger)wordCount;
Category #import  "NSString.h"   ! @interface  NSString  (H24Utils)   ! -­‐  (NSUInteger)wordCount;   ! @end NSString+H24Utils.h NSString+H24Utils.m
Category #import  "NSString.h"   ! @interface  NSString  (H24Utils)   ! -­‐  (NSUInteger)wordCount;   ! @end NSString+H24Utils.h NSString+H24Utils.m #import  "NSString+H24Utils.h"   ! @implementation  NSString  (H24Utils)   ! -­‐  (NSUInteger)wordCount  {     …       }   ! @end
Naming conventions Classes Objects camelCase with capitalised first letter (a.k.a. Pascal case) Prefixes HelloWorldViewController   camelCase viewController,  myCar   NSArray,  UIView  
BOOL data type typedef  signed  char     BOOL;   ! #define  YES  (BOOL)1   #define  NO    (BOOL)0
Blocks void  (^sayHello)(NSString  *)  =  ^(NSString  *name)  {       NSLog(@“Hello  %@",  name);         }; NSString  *sayHello  =  @"Hello  World";
Blocks void  (^sayHello)(NSString  *);   ! sayHello  =  ^(NSString  *name)  {          NSLog(@"Hello  %@",  name);   }; void  (^sayHello)(NSString  *)  =  ^(NSString  *name)  {       NSLog(@“Hello  %@",  name);         };
Blocks @interface  Person  :  NSObject   ! @property  NSString  *name;   ! -­‐  (void)welcomeUserWithBlock:(void  (^)(NSString  *))theBlock;   ! @end @implementation  Person   ! …   ! -­‐  (void)welcomeUserWithBlock:(void  (^)(NSString  *))theBlock  {          theBlock(self.name);   }   ! @end
Blocks void  (^sayHello)(NSString  *)  =  ^(NSString  *name)  {       NSLog(@“Hello  %@",  name);         }; Person  *theUser  =  [[Person  alloc]  initWithName:@"Paul"]; [theUser  welcomeUserWithBlock:^(NSString  *name)  {            NSLog(@"Hello  %@",  name);   }]; [theUser  welcomeUserWithBlock:sayHello];
Blocks Person  *theUser  =  [[Person  alloc]  initWithName:@"Paul"]; [theUser  welcomeUserWithBlock:^(NSString  *name)  {            NSLog(@"Hello  %@",  name);   }];
Block scope ! ! Person  *theUser  =  [[Person  alloc]  initWithName:@"Paul"];   ! [theUser  welcomeUserWithBlock:^(NSString  *name)  {            NSLog(@"Hello  %@",  name);   }];    message Module09_02[8635:303] Hello Paul NSString  *message  =  @"Hello  %@";
Block scope NSString  *message  =  @"Hello  %@";   ! ! ! ! ! ! Person  *theUser  =  [[Person  alloc]  initWithName:@"Paul"];   ! [theUser  welcomeUserWithBlock:^(NSString  *name)  {            NSLog(@"Hello  %@",  name);   }];    message ...   ! if  (morning)  {          message  =  @"Good  morning  %@";   } Module09_02[8693:303] Good morning Paul
Example UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Hello" message:@"Are you sure?" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil]; [alert show]; - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { ... }
Example @interface  UIAlertView  (H24Blocks)   ! ! +  (UIAlertView*)  alertViewWithTitle:(NSString*)  title                                                                                                message:(NSString*)  message                                        cancelButtonTitle:(NSString*)  cancelButtonTitle                                      otherButtonTitles:(NSArray*)  otherButtons                                                      onDismiss:(IndexBlock)  dismissed                                                                                    onCancel:(EmptyBlock)  cancelled;   ! @end
Example [UIAlertView  alertViewWithTitle:@"Hello"                                                  message:@"Hello  World"                              cancelButtonTitle:@"Cancel"                              otherButtonTitles:@[@"OK"]                                              onDismiss:^(int  buttonIndex)  {                                                      NSLog(@"Dismissed");                                              }  onCancel:^{                                                      NSLog(@"Cancelled");                                              }];
iOS Application Development Design Patterns
Design Patterns ‣ Accessors Pattern ‣ allows access to an object properties through simple methods ‣Anonymous Type Pattern ‣ send message to objects of an uncertain (at compilation) type ‣2-stage Object Creation Pattern ‣ alloc + init = new ‣ allow custom initialisers ‣Outlets, targets & actions ‣ configuration of and interaction with UI elements
MVC Model View Controller
MV[C] Model View Controller
[M]VC Model View Controller
[M]VC Model View Controller !View Controller
MVC
MVC
Decorator pattern ‣ add bevaviour to an object ‣ without affecting the behaviour of other objects from the same class
Categories ‣ adds functionality to classes without the need to subclass ‣ group common methods and implement them across the relevant framework ‣ informal protocols (unimplemented methods) ‣ anonymous category (private methods)
Delegation ‣ a delegate is an object that works together with its delegator to solve a problem ‣ a delegate adds/changes the behaviour of the delegator (avoids subclassing) ‣ loose coupling ‣ a delegate is usually referenced using the anonymous type @interface MyAppDelegate : NSObject <UIApplicationDelegate>
Observer pattern ‣ enables communication between objects ‣ no coupling ‣ one object notifies another object (registered as ‘listener’) when a change occurs
Notifications ‣ an object registers as observer ‣ when a notification is sent to the Notification Center, it is distributed to all listeners [NSNotificationCenter  defaultCenter]
Notifications [[NSNotificationCenter  defaultCenter]  addObserver:self                              selector:@selector(soSomething)                                          name:@"H24CourseNotification"                                     object:nil];     [[NSNotificationCenter  defaultCenter]  postNotificationName:@"H24CourseNotification"                                      object:nil];     [[NSNotificationCenter  defaultCenter]  removeObserver:self];
Key-Value Observing ‣ KVC - Key Value Coding ‣ KVO - Key Value Observing
KVC @interface  Vehicle  :  NSObject @end
KVC @interface  Vehicle  :  NSObject @end @property  NSString  *maker;
KVC @interface  Vehicle  :  NSObject @end myCar.maker   [myCar  maker] myCar.maker  =  @"Ford";   [myCar  setMaker:@"Ford"]; @property  NSString  *maker;
KVC @interface  Vehicle  :  NSObject @end [myCar  valueForKey:@"maker"];   [myCar  setValue:@"Ford"  forKey:@"maker"]; myCar.maker   [myCar  maker] myCar.maker  =  @"Ford";   [myCar  setMaker:@"Ford"]; @property  NSString  *maker;
KVC @interface  Vehicle  :  NSObject @end @property  User  *owner; myCar.maker   [myCar  maker] myCar.maker  =  @"Ford";   [myCar  setMaker:@"Ford"]; @property  NSString  *maker; [myCar  valueForKey:@"maker"];   [myCar  setValue:@"Ford"  forKey:@"maker"];
KVC @interface  Vehicle  :  NSObject @end @property  User  *owner; [myCar  valueForKeyPath:@"owner.firstName"]   [myCar  setValue:@"John"  forKeyPath:@"owner.firstName"];   myCar.maker   [myCar  maker] myCar.maker  =  @"Ford";   [myCar  setMaker:@"Ford"]; @property  NSString  *maker; [myCar  valueForKey:@"maker"];   [myCar  setValue:@"Ford"  forKey:@"maker"];
KVO [aVehicle  addObserver:self                        forKeyPath:@"owner"                              options:NSKeyValueObservingOptionNew                              context:nil]; options:(NSKeyValueObservingOptionNew  |  NSKeyValueObservingOptionOld)
KVO - (void)observeValueForKeyPath:(NSString *)keyPath " ofObject:(id)object " change:(NSDictionary *)change " context:(void *)context
KVO [vehicle  removeObserver:self  forKeyPath:@"owner"];
Key-Value Observing ‣ KVC - Key Value Coding ‣ KVO - Key Value Observing
Facade pattern ‣ simplified interface to a larger body of code ‣ subsystems accessed through a well defined entry point ‣ allows subsystems to change without affecting the overall functionality
UIImage +  (UIImage  *)imageWithContentsOfFile:(NSString  *)path +  (UIImage  *)imageNamed:(NSString  *)name
Anatomy of an app #import  <UIKit/UIKit.h>   ! #import  "AppDelegate.h"   ! int  main(int  argc,  char  *  argv[])   {          @autoreleasepool  {                  return  UIApplicationMain(argc,  argv,  nil,                                                                    NSStringFromClass([AppDelegate  class]));          }   } main.m
iOS Application Development App states
Slide Hello24 Ltd. (c) 2014 App states 122 Active Inactive Running Suspende Running Not running Background
Slide Hello24 Ltd. (c) 2014 No background 123
Slide Hello24 Ltd. (c) 2014 App life cycle 124 Active Inactive Running Suspended iPhone OS 3 iOS 4 Running Not running Running Not running Background
Slide Hello24 Ltd. (c) 2014 AppDelegate callbacks ‣ application:willFinishLaunchingWithOptions: ‣ application:didFinishLaunchingWithOptions: ‣ applicationDidBecomeActive: ‣ applicationWillResignActive: ‣ applicationDidEnterBackground: ‣ applicationWillEnterForeground: ‣ applicationWillTerminate: 125
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 126 Active Inactive Running Suspended
Slide Hello24 Ltd. (c) 2014 App life cycle - app start 127 ForegroundActive Inactive BackgroundRunning Suspended Not running 1
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 128 Active Inactive Running Suspended willFinishLaunchingWithOptions: 1
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 129 Active Inactive Running Suspended 2 willFinishLaunchingWithOptions: 1
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 130 Active Inactive Running Suspended 2 willFinishLaunchingWithOptions: 1 didFinishLaunchingWithOptions:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 131 Active Inactive Running Suspended 2 willFinishLaunchingWithOptions: 1 didFinishLaunchingWithOptions: applicationDidBecomeActive:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle - inactive 132 Active Inactive Running Suspended
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 133 Active Inactive Running Suspended
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 134 Active Inactive Running Suspended applicationDidResignActive:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 135 Active Inactive Running Suspended applicationDidResignActive:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 136 Active Inactive Running Suspended applicationDidResignActive: applicationDidBecomeActive:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle - background 137 Active Inactive Running Suspended
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 138 Active Inactive Running Suspended 1
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 139 Active Inactive Running Suspended 1 applicationDidResignActive:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 140 Active Inactive Running Suspended 1 applicationDidResignActive: 2
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 141 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 142 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 143 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 144 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8 9
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 145 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8 9 applicationDidEnterForeground:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 146 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8 9 10 applicationDidEnterForeground:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 147 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8 9 10 applicationDidEnterForeground: applicationDidBecomeActive:
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle - terminate 148 Active Inactive Running Suspended
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 149 Active Inactive Running Suspended
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 150 Active Inactive Running Suspended
Slide Hello24 Ltd. (c) 2014 Foreground Background Not running App life cycle 151 Active Inactive Running Suspended applicationWillTerminate:
iOS Application Development Debug & Testing
Instruments
Instruments - Leaks
Instruments - Allocations
Instruments - Zombies
Instruments - Time Profiler
Instruments
Network Link Conditioner
Network Link Conditioner
Network Link Conditioner on device
Pony Debugger
Pony Debugger [16:04:17] paul@Pro2x:project1 [502] $ ponyd serve --listen-interface=127.0.0.1 PonyGateway starting. Listening on 127.0.0.1:9000 [17:14:22] paul@Pro2x:MyPony [516] $ pod install Setting up CocoaPods master repo Setup completed (read-only access) Analyzing dependencies Downloading dependencies Installing PonyDebugger (0.3.1) Installing SocketRocket (0.3.1-beta2) Generating Pods project Integrating client project ! [!] From now on use `MyPony.xcworkspace`. [deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
Pony Debugger        PDDebugger  *debugger  =  [PDDebugger  defaultInstance];          [debugger  connectToURL:[NSURL  URLWithString:@"ws://127.0.0.1:9000/device"]];          [debugger  forwardAllNetworkTraffic];                    [debugger  enableCoreDataDebugging];          [debugger  addManagedObjectContext:self.managedObjectContext  withName:@"MyPony"];                    [debugger  enableViewHierarchyDebugging];          [debugger  enableRemoteLogging];
Pony Debugger
Pony Debugger
Reveal
iOS Application Development Ad-Hoc distribution
TestFlight
TestFlight
TestFlight
TestFlight
HockeyApp
HockeyApp
HockeyApp
iOS Application Development Publishing
iTunes Connect
New App
Pricing Matrix
Categories
App Rating
Review http://reviewtimes.shinydevelopment.com/
Ready for sale!
Newsstand apps
Newsstand apps
iAd
iAd
iAd
iOS Application Development What is an app?
What is an app? ‣ A package that is installed on a device ‣ Runs in a sandboxed environment ‣ Has limited access to system resources ‣ The limits can change over time ‣ Can retrieve remote information (when connection available) ‣ Can run in background
The apps
The apps
The IPA
The App
The plan ‣ Why iOS? ‣ Tools ‣ Storyboarding ‣ Objective-C ‣ Design patterns ‣ Debug & Testing ‣ Ad-Hoc distribution ‣ Publishing in the app store
Thank you! @pardel ! hello24.com paul@hello24.com

More Related Content

PDF
Oop in java script
byPierre Spring
 
PDF
Bucketlist travel app
byPriyanka Godbole
 
PPT
On Scala Slides - OSDC 2009
byMichael Neale
 
PDF
Best practices for crafting high quality PHP apps (PHP South Africa 2018)
byJames Titcumb
 
PDF
Best practices for crafting high quality PHP apps (ScotlandPHP 2018)
byJames Titcumb
 
PPTX
iOS App Development with F# and Xamarin
byRachel Reese
 
PDF
Android performance tuning. Memory.
bySergii Kozyrev
 
PDF
Deep Parameters Tuning for Android Mobile Apps
byDavide De Chiara
 
Oop in java script
byPierre Spring
 
Bucketlist travel app
byPriyanka Godbole
 
On Scala Slides - OSDC 2009
byMichael Neale
 
Best practices for crafting high quality PHP apps (PHP South Africa 2018)
byJames Titcumb
 
Best practices for crafting high quality PHP apps (ScotlandPHP 2018)
byJames Titcumb
 
iOS App Development with F# and Xamarin
byRachel Reese
 
Android performance tuning. Memory.
bySergii Kozyrev
 
Deep Parameters Tuning for Android Mobile Apps
byDavide De Chiara
 

Viewers also liked

PDF
Tuning Android Applications (Part One)
byCommonsWare
 
PDF
Objective-C for Java developers
byFábio Bernardo
 
PDF
Performance Tuning - Memory leaks, Thread deadlocks, JDK tools
byHaribabu Nandyal Padmanaban
 
PDF
Introduction to ART (Android Runtime)
byIordanis (Jordan) Giannakakis
 
PPT
iOS Application Testing
byMreetyunjaya Daas
 
PDF
Performance optimization for Android
byArslan Anwar
 
PDF
LAS16-201: ART JIT in Android N
byLinaro
 
PDF
Tuning android for low ram devices
byDroidcon Berlin
 
PPTX
Android Performance Best Practices
byAmgad Muhammad
 
PDF
Objective-C for Java Developers
byBob McCune
 
ODP
Java Garbage Collection, Monitoring, and Tuning
byCarol McDonald
 
PPT
Jvm Performance Tunning
byTerry Cho
 
PPTX
Layer architecture of ios (1)
bydwipalp
 
PDF
Building iOS App Project & Architecture
byMassimo Oliviero
 
PDF
MySQL Performance Tuning: Top 10 Tips
byOSSCube
 
PPTX
Google ART (Android RunTime)
byNiraj Solanke
 
PDF
Designing better user interfaces
byJohan Ronsse
 
PPT
Android & iOS Automation Using Appium
byMindfire Solutions
 
PDF
Architecting iOS Project
byMassimo Oliviero
 
PDF
iOS for Android Developers (with Swift)
byDavid Truxall
 
Tuning Android Applications (Part One)
byCommonsWare
 
Objective-C for Java developers
byFábio Bernardo
 
Performance Tuning - Memory leaks, Thread deadlocks, JDK tools
byHaribabu Nandyal Padmanaban
 
Introduction to ART (Android Runtime)
byIordanis (Jordan) Giannakakis
 
iOS Application Testing
byMreetyunjaya Daas
 
Performance optimization for Android
byArslan Anwar
 
LAS16-201: ART JIT in Android N
byLinaro
 
Tuning android for low ram devices
byDroidcon Berlin
 
Android Performance Best Practices
byAmgad Muhammad
 
Objective-C for Java Developers
byBob McCune
 
Java Garbage Collection, Monitoring, and Tuning
byCarol McDonald
 
Jvm Performance Tunning
byTerry Cho
 
Layer architecture of ios (1)
bydwipalp
 
Building iOS App Project & Architecture
byMassimo Oliviero
 
MySQL Performance Tuning: Top 10 Tips
byOSSCube
 
Google ART (Android RunTime)
byNiraj Solanke
 
Designing better user interfaces
byJohan Ronsse
 
Android & iOS Automation Using Appium
byMindfire Solutions
 
Architecting iOS Project
byMassimo Oliviero
 
iOS for Android Developers (with Swift)
byDavid Truxall
 

Similar to iOS Developer Overview - DevWeek 2014

PDF
Session 3 - Object oriented programming with Objective-C (part 1)
byVu Tran Lam
 
PDF
Никита Корчагин - Programming Apple iOS with Objective-C
byDataArt
 
PDF
FI MUNI 2012 - iOS Basics
byPetr Dvorak
 
PPT
iOS Application Development
byCompare Infobase Limited
 
PPTX
Ios fundamentals with ObjectiveC
byMadusha Perera
 
PDF
MFF UK - Introduction to iOS
byPetr Dvorak
 
PDF
02 objective-c session 2
byAmr Elghadban (AmrAngry)
 
PPTX
iOS,From Development to Distribution
byTunvir Rahman Tusher
 
PDF
Bootstrapping iPhone Development
byThoughtWorks
 
KEY
Objective c
byStijn
 
PPT
Objective c
byricky_chatur2005
 
PDF
Intro to iOS Development • Made by Many
bykenatmxm
 
PPT
Objective c intro (1)
byDavid Echeverria
 
PDF
Irving iOS Jumpstart Meetup - Objective-C Session 1b
byirving-ios-jumpstart
 
PPT
iPhone development from a Java perspective (Jazoon '09)
byNetcetera
 
KEY
Objective-C Crash Course for Web Developers
byJoris Verbogt
 
PDF
Louis Loizides iOS Programming Introduction
byLou Loizides
 
PDF
iOS Programming Intro
byLou Loizides
 
PPT
Ios development
byShakil Ahmed
 
PDF
What Makes Objective C Dynamic?
byKyle Oba
 
Session 3 - Object oriented programming with Objective-C (part 1)
byVu Tran Lam
 
Никита Корчагин - Programming Apple iOS with Objective-C
byDataArt
 
FI MUNI 2012 - iOS Basics
byPetr Dvorak
 
iOS Application Development
byCompare Infobase Limited
 
Ios fundamentals with ObjectiveC
byMadusha Perera
 
MFF UK - Introduction to iOS
byPetr Dvorak
 
02 objective-c session 2
byAmr Elghadban (AmrAngry)
 
iOS,From Development to Distribution
byTunvir Rahman Tusher
 
Bootstrapping iPhone Development
byThoughtWorks
 
Objective c
byStijn
 
Objective c
byricky_chatur2005
 
Intro to iOS Development • Made by Many
bykenatmxm
 
Objective c intro (1)
byDavid Echeverria
 
Irving iOS Jumpstart Meetup - Objective-C Session 1b
byirving-ios-jumpstart
 
iPhone development from a Java perspective (Jazoon '09)
byNetcetera
 
Objective-C Crash Course for Web Developers
byJoris Verbogt
 
Louis Loizides iOS Programming Introduction
byLou Loizides
 
iOS Programming Intro
byLou Loizides
 
Ios development
byShakil Ahmed
 
What Makes Objective C Dynamic?
byKyle Oba
 

More from Paul Ardeleanu

PDF
Test or Go Fishing - a guide on how to write better Swift for iOS
byPaul Ardeleanu
 
PDF
Test or Go Fishing - A guide on how to write better Swift for iOS
byPaul Ardeleanu
 
PDF
Prototype your dream
byPaul Ardeleanu
 
PDF
Test or Go Fishing - a guide on how to write better Swift for iOS
byPaul Ardeleanu
 
PDF
Architecting apps - Can we write better code by planning ahead?
byPaul Ardeleanu
 
PDF
iOSNeXT.ro - 10 reasons you'll love Swift - Paul Ardeleanu
byPaul Ardeleanu
 
PDF
iOSNeXT.ro - Scout mapping & navigation SDK for iOS developers - Zoltan Korosi
byPaul Ardeleanu
 
PPT
iOSNeXT.ro - Catwalk15 - Mark Filipas
byPaul Ardeleanu
 
PPTX
iOSNeXT.ro - Lessons learnt as Indie Developer in Romania - Alexandru Iliescu
byPaul Ardeleanu
 
PDF
7 things one should learn from iOS
byPaul Ardeleanu
 
PDF
iOScon 2014
byPaul Ardeleanu
 
PDF
To swiftly go where no OS has gone before
byPaul Ardeleanu
 
PDF
Prototyping saves your bacon
byPaul Ardeleanu
 
PDF
My talk @ Timisoara Mobile Development Group February Meetup
byPaul Ardeleanu
 
PDF
How to prototype your mobile apps
byPaul Ardeleanu
 
KEY
Native vs html5
byPaul Ardeleanu
 
PDF
Prototyping your iPhone/iPad app
byPaul Ardeleanu
 
KEY
Whats new in iOS5
byPaul Ardeleanu
 
KEY
There is no spoon - iPhone vs. iPad
byPaul Ardeleanu
 
KEY
The Adventure - From idea to the iPhone
byPaul Ardeleanu
 
Test or Go Fishing - a guide on how to write better Swift for iOS
byPaul Ardeleanu
 
Test or Go Fishing - A guide on how to write better Swift for iOS
byPaul Ardeleanu
 
Prototype your dream
byPaul Ardeleanu
 
Test or Go Fishing - a guide on how to write better Swift for iOS
byPaul Ardeleanu
 
Architecting apps - Can we write better code by planning ahead?
byPaul Ardeleanu
 
iOSNeXT.ro - 10 reasons you'll love Swift - Paul Ardeleanu
byPaul Ardeleanu
 
iOSNeXT.ro - Scout mapping & navigation SDK for iOS developers - Zoltan Korosi
byPaul Ardeleanu
 
iOSNeXT.ro - Catwalk15 - Mark Filipas
byPaul Ardeleanu
 
iOSNeXT.ro - Lessons learnt as Indie Developer in Romania - Alexandru Iliescu
byPaul Ardeleanu
 
7 things one should learn from iOS
byPaul Ardeleanu
 
iOScon 2014
byPaul Ardeleanu
 
To swiftly go where no OS has gone before
byPaul Ardeleanu
 
Prototyping saves your bacon
byPaul Ardeleanu
 
My talk @ Timisoara Mobile Development Group February Meetup
byPaul Ardeleanu
 
How to prototype your mobile apps
byPaul Ardeleanu
 
Native vs html5
byPaul Ardeleanu
 
Prototyping your iPhone/iPad app
byPaul Ardeleanu
 
Whats new in iOS5
byPaul Ardeleanu
 
There is no spoon - iPhone vs. iPad
byPaul Ardeleanu
 
The Adventure - From idea to the iPhone
byPaul Ardeleanu
 

Recently uploaded

PDF
Empower your IT team with cloud-based PC management using Dell Management Por...
byPrincipled Technologies
 
PDF
Agent to agent service discovery using HashiCorp Consul and Vault
byBram Vogelaar
 
PDF
Chapter 5 Security Mechanisms iin computer security.pdf
byGetnet Tigabie Askale -(GM)
 
PDF
UiPath Automation Developer Associate Training Series 2025 - Session 4
byDianaGray10
 
PDF
How AI Can Help Platform Engineers Build Better Platforms
byAll Things Open
 
PDF
Digital Twin in IBM for Accelerated Discovery of Climate & Sustainability, K...
byMichiaki Tatsubori
 
PDF
apidays Paris 2025 | API Layer7 Security: Real-World Use Cases (BBVA & Nexi)
byapidays
 
PPTX
Spacecraft Guidance Quick Research Guide by Arthur Morgan
byArthur Morgan
 
PDF
Founder & Tech Lead | Web Development & Digital Growth Consultant | Helping B...
byShyamal Das
 
PDF
Odoo Implementation Checklist: A Strategic ERP Blueprint for Business-Ready D...
byBANIBRO IT SOLUTION
 
PDF
AI in the Real World: From University to Industry
byDarvan Shvan
 
PPTX
Workflow and decision Automation with Flowable
bychakib ch
 
PDF
final~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.pdf
byomarbishtawi04
 
PDF
Spec-Driven Development with Kiro: Elevating Software Quality, Traceability, ...
byHaim Michael
 
PDF
TrustArc Webinar - From Trends to Action: Fitting AI Governance into Privacy Ops
byTrustArc
 
PDF
Reality Drift: Why Systems Keep Working After Meaning Drops Out
byReality Drift Archive | A. Jacobs
 
PDF
AI Vector Search Best Practices Multicloud Feb 2026
bySandesh Rao
 
PPTX
Real-Time KPI Dashboard Playbook: What to Track Live and What Not To
byvictorworkvebo
 
PDF
20260212 Security-JAWS activity results for 2025 and activity goals for 2026
byTyphon 666
 
PPTX
Microsoft Azure News - February 2026 - BAUG
byDaniel Toomey
 
Empower your IT team with cloud-based PC management using Dell Management Por...
byPrincipled Technologies
 
Agent to agent service discovery using HashiCorp Consul and Vault
byBram Vogelaar
 
Chapter 5 Security Mechanisms iin computer security.pdf
byGetnet Tigabie Askale -(GM)
 
UiPath Automation Developer Associate Training Series 2025 - Session 4
byDianaGray10
 
How AI Can Help Platform Engineers Build Better Platforms
byAll Things Open
 
Digital Twin in IBM for Accelerated Discovery of Climate & Sustainability, K...
byMichiaki Tatsubori
 
apidays Paris 2025 | API Layer7 Security: Real-World Use Cases (BBVA & Nexi)
byapidays
 
Spacecraft Guidance Quick Research Guide by Arthur Morgan
byArthur Morgan
 
Founder & Tech Lead | Web Development & Digital Growth Consultant | Helping B...
byShyamal Das
 
Odoo Implementation Checklist: A Strategic ERP Blueprint for Business-Ready D...
byBANIBRO IT SOLUTION
 
AI in the Real World: From University to Industry
byDarvan Shvan
 
Workflow and decision Automation with Flowable
bychakib ch
 
final~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.pdf
byomarbishtawi04
 
Spec-Driven Development with Kiro: Elevating Software Quality, Traceability, ...
byHaim Michael
 
TrustArc Webinar - From Trends to Action: Fitting AI Governance into Privacy Ops
byTrustArc
 
Reality Drift: Why Systems Keep Working After Meaning Drops Out
byReality Drift Archive | A. Jacobs
 
AI Vector Search Best Practices Multicloud Feb 2026
bySandesh Rao
 
Real-Time KPI Dashboard Playbook: What to Track Live and What Not To
byvictorworkvebo
 
20260212 Security-JAWS activity results for 2025 and activity goals for 2026
byTyphon 666
 
Microsoft Azure News - February 2026 - BAUG
byDaniel Toomey
 

iOS Developer Overview - DevWeek 2014

  • 1.
    iOS Application Development iOSDeveloper Overview Paul Ardeleanu
  • 3.
    Assumptions… You are: ‣ adeveloper of sorts… ‣ have no or little exposure to iOS ‣ want to learn enough to become ‘dangerous’
  • 4.
    The plan ‣ WhyiOS? ‣ Tools ‣ Storyboarding ‣ Objective-C ‣ Design patterns ‣ Debug & Testing ‣ Ad-Hoc distribution ‣ Publishing in the app store
  • 5.
  • 6.
  • 7.
    … there werephones http://www.flickr.com/photos/adrianblack/371301544/
  • 8.
    Then the iPhonehappened…
  • 9.
  • 10.
  • 11.
    Global Phone Market Unitsshipped / quarter © Asymco - used with permission
  • 12.
    Smartphone shipments © Asymco- used with permission
  • 13.
    © Asymco -used with permission
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26.
  • 27.
  • 28.
  • 29.
  • 30.
  • 31.
    Building great apps ‣Constraints ‣ small size ‣ limited hardware ‣ one screen at a time ‣ one application at a time * ‣ touch input ‣ Interaction ‣ gestures ‣ shake ‣ orientation ‣ audio switch, volume buttons ‣ home & power buttons
  • 32.
  • 33.
    Application Definition Statement “Aconcise, concrete declaration of the app’s main purpose and its intended audience.” https://developer.apple.com/library/ios/documentation/ UserExperience/Conceptual/MobileHIG/
  • 34.
    Solve real problems "Anapp must solve a user's problem clearly and elegantly." Eric Hope, User Experience Evangelist, Apple
  • 35.
    Delivery channels ‣ webapp [dedicated] ‣ native app ‣ “hybrid” solutions
  • 36.
  • 37.
    What is Storyboarding ‣Design the “screens” that compose your app => scenes ‣ Visually define the navigation between the scenes => segues ‣ Introduced in: iOS 5 & Xcode 4.2
  • 38.
    Xcode 5 -default
  • 39.
    Xcode 4 -optional
  • 40.
  • 41.
  • 42.
    Specialised View Controllers ‣UITableViewController ‣ UINavigationController ‣ UITabBarController ‣ UICollectionView
  • 43.
  • 44.
  • 45.
  • 46.
  • 47.
  • 48.
  • 49.
  • 50.
  • 51.
    What is ObjectiveC ‣ Thin layer on top of C; strict superset of C ‣ Object-oriented programming language ‣ Inspired by SmallTalk ‣ Developed by Stepstone / NeXT Software / Apple ‣ The development language for Mac OSX & iOS devices
  • 52.
    Object-Oriented Programming a programmingparadigm that uses "objects" ! myCar • Number of wheels • Number of seats • Colour • Engine size • Top speed • Drive • Brake • Turn Left • Beep • Fill with petrol MethodsProperties Data + Behaviour
  • 53.
    Vehicle class Interface .hImplementation .m Vehicle.h Vehicle.m @interface  Vehicle  {     int  wheels;         int  seats;       }   ! -­‐  (void)drive;   -­‐  (void)setWheels:(int)n;   ! @end #import  "Vehicle.h"   ! @implementation  Vehicle   ! -­‐  (void)setWheels:(int)n  {     wheels  =  n;       }   ! -­‐  (void)drive  {     …       }   ! @end
  • 54.
    Methods syntax -­‐  (void)setWheels:(int)n; returntype name argument type argument name type
  • 55.
    Multiple arguments -­‐  (BOOL)application:(UIApplication  *)application   didFinishLaunchingWithOptions:(NSDictionary  *)launchOptions application:didFinishLaunchingWithOptions: The name of the method is:
  • 56.
    Multiple arguments + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void(^)(void))animations completion:(void (^)(BOOL finished))completion; + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations;
  • 57.
    Multiple arguments [UIView animateWithDuration:1.0 delay:0.3 options:UIViewAnimationOptionCurveEaseIn animations:^{ //animations } completion:^(BOOL finished) { // completion block } ]; + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;
  • 58.
    Properties @implementation  Vehicle   ! -­‐  (int)wheels  {     return  wheels;       }   ! -­‐  (void)setWheels:(int)n  {     wheels  =  n;       }   ! @end @interface  Vehicle  :  NSObject  {     int  wheels;       }   ! -­‐  (int)wheels;   -­‐  (void)setWheels:(int)n;   ! @end @implementation  Vehicle   ! ! ! @end @interface  Vehicle  :  NSObject  {   ! }   ! @property  int  noWheels;   ! @end   int  numberWheels;     @synthesize  numberWheels;
  • 59.
    Properties & dotnotation Vehicle  *myCar  =  [Vehicle  new];   ! myCar.wheels  =  5;   ! myCar.wheels  
  • 60.
    What is amethod? typedef  struct  objc_selector  *SEL; ! Vehicle  *myCar  =  [Vehicle  new];   ! [myCar  drive]; objc_msgSend(myCar,  @selector(drive))
  • 61.
    Sending a message -­‐  (void)setWheels:  (int)n; [myCar  setWheels:4]; objc_msgSend(myCar,  @selector(setWheels:),  4);
  • 62.
    Sending a message ! Vehicle  *myCar  =  nil;   ! [myCar  drive];   myCar  =  ...;             if  ([myCar  respondsToSelector:@selector(drive)])  {        [myCar  drive];       }  
  • 63.
    Initialisers Vehicle *myCar =[Vehicle new]; -­‐  (id)initWithWheels:(int)wheels  {     self  =  [super  init];         if  (nil  !=  self)  {          //  Custom  initialization          self.wheels  =  wheels;         }         return  self;       } Vehicle *myCar = [[Vehicle alloc] initWithWheels:4]; Vehicle *myCar = [[Vehicle alloc] init];
  • 64.
    InitialisersMultiple @interface  Vehicle  :  NSObject   ! @property  int  wheels;   @property  int  seats;   ! -­‐  (id)initWithWheels:(int)wheels  andSeats:(int)seats;   -­‐  (id)initWithWheels:(int)wheels;   -­‐  (id)initWithSeats:(int)seats;   ! @end
  • 65.
    InitialisersMultiple -­‐  (id)init  {     return  [self  initWithWheels:DefaultNumberWheels  andSeats:DefaultNumberSeats];       }   #define  DefaultNumberWheels  4   #define  DefaultNumberSeats  5 -­‐  (id)initWithWheels:(int)wheels  andSeats:(int)seats{     self  =  [super  init];         if  (nil  !=  self)  {       self.wheels  =  wheels;   self.seats  =  seats;     }         return  self;       } -­‐  (id)initWithWheels:(int)wheels  {     return  [self  initWithWheels:wheels  andSeats:                                    ];       } -­‐  (id)initWithNumberSeats:(int)seats  {     return  [self  initWithWheels:DefaultNumberWheels  andSeats:seats];       } DefaultNumberSeats
  • 66.
    Inheritance @interface  Truck  :  Vehicle     ! ! ! ! ! ! ! ! ! ! ! @end   @interface  Vehicle  :  NSObject     ! @property  int  wheels;   @property  int  seats;   ! -­‐  (void)drive;   ! @end -­‐  (void)checkLoad;   -­‐  (void)loadWithWeight:(int)weight;   -­‐  (void)unload;                                                      {     int  maxWeight;       } @property  int  currentWeight;
  • 67.
  • 68.
  • 69.
    Polymorphism & Dynamictyping Vehicle Truck ! - (void)drive Car ! - (void)drive id  aVehicle;   ! ...   ! [aVehicle  drive];
  • 70.
    id ‣ the genericobject type ‣ can be used for object of any type ‣ the object class is determined at runtime (dynamic typing) Vehicle  *aCar; Static typing id  aCar; Dynamic typing
  • 71.
    Introspection NSObject - (BOOL)isKindOfClass:(Class)aClass; - (BOOL)isMemberOfClass:(Class)aClass; -(Class)superclass; - (Class)class; - (BOOL)respondsToSelector:(SEL)aSelector;
  • 72.
    Protocols -­‐  (void)load;   -­‐  (void)unload;   -­‐  (float)getWeight; @interface  Truck  :  Vehicle @end
  • 73.
    Protocols -­‐  (void)load;   -­‐  (void)unload;   -­‐  (float)getWeight; @implementation  Truck   ! ! ! ! ! ! ! ! ! ! ! ! ! @end -­‐  (void)load  {     ...       }   -­‐  (void)unload  {     ...       }   -­‐  (float)getWeight  {     ...       }   @interface  Truck  :  Vehicle @end
  • 74.
    Protocols -­‐  (void)load;   -­‐  (void)unload;   -­‐  (float)getWeight; @interface  Truck  :  Vehicle @end @protocol  VehicleLoading @end <VehicleLoading>
  • 75.
    Protocols -­‐  (void)load;   -­‐  (void)unload;   -­‐  (float)getWeight; @interface  Truck  :  Vehicle @end @protocol  VehicleLoading @end <VehicleLoading> @implementation  Truck   ! ! ! ! ! ! ! ! ! ! ! ! ! @end -­‐  (void)load  {     ...         }   -­‐  (void)unload  {     ...         }   -­‐  (float)getWeight  {     ...         }  
  • 76.
    Category @interface  Vehicle  :  NSObject     ! ...   ! -­‐  (void)drive;   -­‐  (void)brake;   ! @end ! Vehicle  *myCar  =  [Vehicle  new];   [myCar  steerLeft];
  • 77.
    Category @interface NSString :NSObject ! ! ! ! ! ! @end
  • 78.
    @interface NSString :NSObject ! ! ! ! ! ! @end Category - (NSUInteger)wordCount;
  • 79.
    Category #import  "NSString.h"   ! @interface  NSString  (H24Utils)   ! -­‐  (NSUInteger)wordCount;   ! @end NSString+H24Utils.h NSString+H24Utils.m
  • 80.
    Category #import  "NSString.h"   ! @interface  NSString  (H24Utils)   ! -­‐  (NSUInteger)wordCount;   ! @end NSString+H24Utils.h NSString+H24Utils.m #import  "NSString+H24Utils.h"   ! @implementation  NSString  (H24Utils)   ! -­‐  (NSUInteger)wordCount  {     …       }   ! @end
  • 81.
    Naming conventions Classes Objects camelCase withcapitalised first letter (a.k.a. Pascal case) Prefixes HelloWorldViewController   camelCase viewController,  myCar   NSArray,  UIView  
  • 82.
    BOOL data type typedef  signed  char     BOOL;   ! #define  YES  (BOOL)1   #define  NO    (BOOL)0
  • 83.
    Blocks void  (^sayHello)(NSString  *)  =  ^(NSString  *name)  {       NSLog(@“Hello  %@",  name);         }; NSString  *sayHello  =  @"Hello  World";
  • 84.
    Blocks void  (^sayHello)(NSString  *);   ! sayHello  =  ^(NSString  *name)  {          NSLog(@"Hello  %@",  name);   }; void  (^sayHello)(NSString  *)  =  ^(NSString  *name)  {       NSLog(@“Hello  %@",  name);         };
  • 85.
    Blocks @interface  Person  :  NSObject   ! @property  NSString  *name;   ! -­‐  (void)welcomeUserWithBlock:(void  (^)(NSString  *))theBlock;   ! @end @implementation  Person   ! …   ! -­‐  (void)welcomeUserWithBlock:(void  (^)(NSString  *))theBlock  {          theBlock(self.name);   }   ! @end
  • 86.
    Blocks void  (^sayHello)(NSString  *)  =  ^(NSString  *name)  {       NSLog(@“Hello  %@",  name);         }; Person  *theUser  =  [[Person  alloc]  initWithName:@"Paul"]; [theUser  welcomeUserWithBlock:^(NSString  *name)  {            NSLog(@"Hello  %@",  name);   }]; [theUser  welcomeUserWithBlock:sayHello];
  • 87.
    Blocks Person  *theUser  =  [[Person  alloc]  initWithName:@"Paul"]; [theUser  welcomeUserWithBlock:^(NSString  *name)  {            NSLog(@"Hello  %@",  name);   }];
  • 88.
    Block scope ! ! Person  *theUser  =  [[Person  alloc]  initWithName:@"Paul"];   ! [theUser  welcomeUserWithBlock:^(NSString  *name)  {            NSLog(@"Hello  %@",  name);   }];    message Module09_02[8635:303] Hello Paul NSString  *message  =  @"Hello  %@";
  • 89.
    Block scope NSString  *message  =  @"Hello  %@";   ! ! ! ! ! ! Person  *theUser  =  [[Person  alloc]  initWithName:@"Paul"];   ! [theUser  welcomeUserWithBlock:^(NSString  *name)  {            NSLog(@"Hello  %@",  name);   }];    message ...   ! if  (morning)  {          message  =  @"Good  morning  %@";   } Module09_02[8693:303] Good morning Paul
  • 90.
    Example UIAlertView *alert =[[UIAlertView alloc] initWithTitle:@"Hello" message:@"Are you sure?" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil]; [alert show]; - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { ... }
  • 91.
    Example @interface  UIAlertView  (H24Blocks)   ! ! +  (UIAlertView*)  alertViewWithTitle:(NSString*)  title                                                                                                message:(NSString*)  message                                        cancelButtonTitle:(NSString*)  cancelButtonTitle                                      otherButtonTitles:(NSArray*)  otherButtons                                                      onDismiss:(IndexBlock)  dismissed                                                                                    onCancel:(EmptyBlock)  cancelled;   ! @end
  • 92.
    Example [UIAlertView  alertViewWithTitle:@"Hello"                                                  message:@"Hello  World"                              cancelButtonTitle:@"Cancel"                              otherButtonTitles:@[@"OK"]                                              onDismiss:^(int  buttonIndex)  {                                                      NSLog(@"Dismissed");                                              }  onCancel:^{                                                      NSLog(@"Cancelled");                                              }];
  • 93.
  • 94.
    Design Patterns ‣ AccessorsPattern ‣ allows access to an object properties through simple methods ‣Anonymous Type Pattern ‣ send message to objects of an uncertain (at compilation) type ‣2-stage Object Creation Pattern ‣ alloc + init = new ‣ allow custom initialisers ‣Outlets, targets & actions ‣ configuration of and interaction with UI elements
  • 95.
  • 96.
  • 97.
  • 98.
  • 99.
  • 100.
  • 101.
    Decorator pattern ‣ addbevaviour to an object ‣ without affecting the behaviour of other objects from the same class
  • 102.
    Categories ‣ adds functionalityto classes without the need to subclass ‣ group common methods and implement them across the relevant framework ‣ informal protocols (unimplemented methods) ‣ anonymous category (private methods)
  • 103.
    Delegation ‣ a delegateis an object that works together with its delegator to solve a problem ‣ a delegate adds/changes the behaviour of the delegator (avoids subclassing) ‣ loose coupling ‣ a delegate is usually referenced using the anonymous type @interface MyAppDelegate : NSObject <UIApplicationDelegate>
  • 104.
    Observer pattern ‣ enablescommunication between objects ‣ no coupling ‣ one object notifies another object (registered as ‘listener’) when a change occurs
  • 105.
    Notifications ‣ an objectregisters as observer ‣ when a notification is sent to the Notification Center, it is distributed to all listeners [NSNotificationCenter  defaultCenter]
  • 106.
    Notifications [[NSNotificationCenter  defaultCenter]  addObserver:self                              selector:@selector(soSomething)                                          name:@"H24CourseNotification"                                     object:nil];     [[NSNotificationCenter  defaultCenter]  postNotificationName:@"H24CourseNotification"                                      object:nil];     [[NSNotificationCenter  defaultCenter]  removeObserver:self];
  • 107.
    Key-Value Observing ‣ KVC- Key Value Coding ‣ KVO - Key Value Observing
  • 108.
  • 109.
    KVC @interface  Vehicle  :  NSObject @end @property  NSString  *maker;
  • 110.
    KVC @interface  Vehicle  :  NSObject @end myCar.maker   [myCar  maker] myCar.maker  =  @"Ford";   [myCar  setMaker:@"Ford"]; @property  NSString  *maker;
  • 111.
    KVC @interface  Vehicle  :  NSObject @end [myCar  valueForKey:@"maker"];   [myCar  setValue:@"Ford"  forKey:@"maker"]; myCar.maker   [myCar  maker] myCar.maker  =  @"Ford";   [myCar  setMaker:@"Ford"]; @property  NSString  *maker;
  • 112.
    KVC @interface  Vehicle  :  NSObject @end @property  User  *owner; myCar.maker   [myCar  maker] myCar.maker  =  @"Ford";   [myCar  setMaker:@"Ford"]; @property  NSString  *maker; [myCar  valueForKey:@"maker"];   [myCar  setValue:@"Ford"  forKey:@"maker"];
  • 113.
    KVC @interface  Vehicle  :  NSObject @end @property  User  *owner; [myCar  valueForKeyPath:@"owner.firstName"]   [myCar  setValue:@"John"  forKeyPath:@"owner.firstName"];   myCar.maker   [myCar  maker] myCar.maker  =  @"Ford";   [myCar  setMaker:@"Ford"]; @property  NSString  *maker; [myCar  valueForKey:@"maker"];   [myCar  setValue:@"Ford"  forKey:@"maker"];
  • 114.
    KVO [aVehicle  addObserver:self                        forKeyPath:@"owner"                              options:NSKeyValueObservingOptionNew                              context:nil]; options:(NSKeyValueObservingOptionNew  |  NSKeyValueObservingOptionOld)
  • 115.
    KVO - (void)observeValueForKeyPath:(NSString *)keyPath " ofObject:(id)object" change:(NSDictionary *)change " context:(void *)context
  • 116.
  • 117.
    Key-Value Observing ‣ KVC- Key Value Coding ‣ KVO - Key Value Observing
  • 118.
    Facade pattern ‣ simplifiedinterface to a larger body of code ‣ subsystems accessed through a well defined entry point ‣ allows subsystems to change without affecting the overall functionality
  • 119.
    UIImage +  (UIImage  *)imageWithContentsOfFile:(NSString  *)path +  (UIImage  *)imageNamed:(NSString  *)name
  • 120.
    Anatomy of anapp #import  <UIKit/UIKit.h>   ! #import  "AppDelegate.h"   ! int  main(int  argc,  char  *  argv[])   {          @autoreleasepool  {                  return  UIApplicationMain(argc,  argv,  nil,                                                                    NSStringFromClass([AppDelegate  class]));          }   } main.m
  • 121.
  • 122.
    Slide Hello24 Ltd.(c) 2014 App states 122 Active Inactive Running Suspende Running Not running Background
  • 123.
    Slide Hello24 Ltd.(c) 2014 No background 123
  • 124.
    Slide Hello24 Ltd.(c) 2014 App life cycle 124 Active Inactive Running Suspended iPhone OS 3 iOS 4 Running Not running Running Not running Background
  • 125.
    Slide Hello24 Ltd.(c) 2014 AppDelegate callbacks ‣ application:willFinishLaunchingWithOptions: ‣ application:didFinishLaunchingWithOptions: ‣ applicationDidBecomeActive: ‣ applicationWillResignActive: ‣ applicationDidEnterBackground: ‣ applicationWillEnterForeground: ‣ applicationWillTerminate: 125
  • 126.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 126 Active Inactive Running Suspended
  • 127.
    Slide Hello24 Ltd.(c) 2014 App life cycle - app start 127 ForegroundActive Inactive BackgroundRunning Suspended Not running 1
  • 128.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 128 Active Inactive Running Suspended willFinishLaunchingWithOptions: 1
  • 129.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 129 Active Inactive Running Suspended 2 willFinishLaunchingWithOptions: 1
  • 130.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 130 Active Inactive Running Suspended 2 willFinishLaunchingWithOptions: 1 didFinishLaunchingWithOptions:
  • 131.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 131 Active Inactive Running Suspended 2 willFinishLaunchingWithOptions: 1 didFinishLaunchingWithOptions: applicationDidBecomeActive:
  • 132.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle - inactive 132 Active Inactive Running Suspended
  • 133.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 133 Active Inactive Running Suspended
  • 134.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 134 Active Inactive Running Suspended applicationDidResignActive:
  • 135.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 135 Active Inactive Running Suspended applicationDidResignActive:
  • 136.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 136 Active Inactive Running Suspended applicationDidResignActive: applicationDidBecomeActive:
  • 137.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle - background 137 Active Inactive Running Suspended
  • 138.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 138 Active Inactive Running Suspended 1
  • 139.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 139 Active Inactive Running Suspended 1 applicationDidResignActive:
  • 140.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 140 Active Inactive Running Suspended 1 applicationDidResignActive: 2
  • 141.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 141 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground:
  • 142.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 142 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7
  • 143.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 143 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8
  • 144.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 144 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8 9
  • 145.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 145 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8 9 applicationDidEnterForeground:
  • 146.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 146 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8 9 10 applicationDidEnterForeground:
  • 147.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 147 Active Inactive Running Suspended 1 applicationDidResignActive: 2 applicationDidEnterBackground: 7 8 9 10 applicationDidEnterForeground: applicationDidBecomeActive:
  • 148.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle - terminate 148 Active Inactive Running Suspended
  • 149.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 149 Active Inactive Running Suspended
  • 150.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 150 Active Inactive Running Suspended
  • 151.
    Slide Hello24 Ltd.(c) 2014 Foreground Background Not running App life cycle 151 Active Inactive Running Suspended applicationWillTerminate:
  • 152.
  • 153.
  • 154.
  • 155.
  • 156.
  • 157.
  • 158.
  • 159.
  • 160.
  • 161.
  • 162.
  • 163.
    Pony Debugger [16:04:17] paul@Pro2x:project1[502] $ ponyd serve --listen-interface=127.0.0.1 PonyGateway starting. Listening on 127.0.0.1:9000 [17:14:22] paul@Pro2x:MyPony [516] $ pod install Setting up CocoaPods master repo Setup completed (read-only access) Analyzing dependencies Downloading dependencies Installing PonyDebugger (0.3.1) Installing SocketRocket (0.3.1-beta2) Generating Pods project Integrating client project ! [!] From now on use `MyPony.xcworkspace`. [deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
  • 164.
    Pony Debugger        PDDebugger  *debugger  =  [PDDebugger  defaultInstance];          [debugger  connectToURL:[NSURL  URLWithString:@"ws://127.0.0.1:9000/device"]];          [debugger  forwardAllNetworkTraffic];                    [debugger  enableCoreDataDebugging];          [debugger  addManagedObjectContext:self.managedObjectContext  withName:@"MyPony"];                    [debugger  enableViewHierarchyDebugging];          [debugger  enableRemoteLogging];
  • 165.
  • 166.
  • 167.
  • 168.
  • 169.
  • 170.
  • 171.
  • 172.
  • 173.
  • 174.
  • 175.
  • 176.
  • 177.
  • 178.
  • 179.
  • 180.
  • 181.
  • 182.
  • 183.
  • 184.
  • 185.
  • 186.
  • 187.
  • 188.
  • 189.
  • 190.
    What is anapp? ‣ A package that is installed on a device ‣ Runs in a sandboxed environment ‣ Has limited access to system resources ‣ The limits can change over time ‣ Can retrieve remote information (when connection available) ‣ Can run in background
  • 191.
  • 192.
  • 193.
  • 194.
  • 195.
    The plan ‣ WhyiOS? ‣ Tools ‣ Storyboarding ‣ Objective-C ‣ Design patterns ‣ Debug & Testing ‣ Ad-Hoc distribution ‣ Publishing in the app store
  • 196.