iOS development Crash course in how to build an native application for iPhone. i will be start from beginning till publishing on Apple Store step by step. this session # 3

1. Developing Mobile
Application
Ios : session # 3
By : Amr Elghadban

2. AMR
ELGHADBAN
ABOUT ME
———————————
SOFTWARE ENGINEER
FCI - HELWAN 2010
ITI INTAKE 32
WORKED BEFORE IN
- Tawasol IT
- Etisalat Masr
- NTG Clarity

3. property
@property (nonatomic, weak) NSString *stringProperty;
First our property has a locking term (nonatomic) and a
storage mechanism (weak) specified.
The nonatomic flag prevents the property from being
locked which means that multiple threads can access it
at the same time. By default, properties are atomic (so
they are locked).
Weak means that the property is not tied to the owner
(i.e. one can be released without affecting the other).

4. The basic collection classes of
the Foundation Framework

5. The basic collection classes of
the Foundation Framework
• NSSet, NSArray is immutable, so you
cannot dynamically add or remove items.
• Immutable arrays can be defined as
literals using the @[] syntax
• you’re likely to encounter the more
verbose arrayWithObjects: factory
method a class method

6. Creating Arrays
NSArray *germanMakes = @[@"Mercedes-Benz", @"BMW",
@"Porsche",@"Opel", @"Volkswagen", @“Audi"];
NSArray *ukMakes = [NSArray arrayWithObjects:@"Aston
Martin",@"Lotus", @"Jaguar", @"Bentley", nil];
NSLog(@"First german make: %@", germanMakes[0]);
NSLog(@"First U.K. make: %@", [ukMakes objectAtIndex:0]);
As you can see, individual items can be accessed through the
square-bracket subscripting syntax (germanMakes[0]) or the
objectAtIndex: method, is the standard way to access array
elements.

7. Creating Arrays
NSArray *germanMakes = @[@"Mercedes-Benz", @"BMW",
@"Porsche",@"Opel", @"Volkswagen", @“Audi"];
NSArray *ukMakes = [NSArray arrayWithObjects:@"Aston
Martin",@"Lotus", @"Jaguar", @"Bentley", nil];
NSLog(@"First german make: %@", germanMakes[0]);
NSLog(@"First U.K. make: %@", [ukMakes objectAtIndex:0]);
As you can see, individual items can be accessed through the
square-bracket subscripting syntax (germanMakes[0]) or the
objectAtIndex: method, is the standard way to access array
elements.

8. loops and conditions
Loops and Conditionals
Objective-C supports common looping and
conditionals. Here are examples of the
for(each), for(count), and while loops

9. loops and conditions
for (NSString *string in array) {
//Do Something
}
for (int i = 0; i < number; i++) {
//Do something
}
while (boolean == true) {
//Do something
}

10. loops and conditions
NSArray *germanMakes = @[@"Mercedes-Benz", @"BMW",
@"Porsche",@"Opel", @"Volkswagen", @"Audi"];
// With fast-enumeration
for (NSString *item in germanMakes) {
NSLog(@"%@", item);
}
// With a traditional for loop
for (int i=0; i<[germanMakes count]; i++) {
NSLog(@"%d: %@", i, germanMakes[i]);}
}

11. Main.m
open up Supporting Files/main.m.
we see the entry point to our application.
#import "AppDelegate.h"
int main(int argc, char *argv[])
{
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
The UIApplicationMain method is called to start our application and basically says to
run the AppDelegate.

12. AppDelegate.h
AppDelegate extends
UIResponder and
implements the
UIApplicationDelegate
protocol.

13. AppDelegate.m
Application methods
(didFinishLaunchingWithOptions, applicationWillResignActive,
applicationWillEnterForeground, etc. )
These methods (part of the UIApplicationDelegate) are called when certain
events happen on the app object.
For example,
didFinishLaunchingWithOptions will be called when your app starts.
applicationWillResignActive is called when your app moves into the
background.
The majority of these (non-app starting) methods have to do with the app
going into the background when you should stop tasks from running, store
state, and more or when the application is coming back into an active state

14. UIViewController
Any ViewController you will create
will extends UIViewController.
Methods:
viewDidLoad,viewDidAppear,view
WillAppear,ViewWillDisappear/
DidDisappear

15. View
Lifecycle

16. UIViewController
• ViewDidLoad - Whenever I'm adding controls to a view that should
appear together with the view, right away, I put it in the ViewDidLoad
method. Basically this method is called whenever the view was loaded into
memory. So for example, if my view is a form with 3 labels, I would add the
labels here; the view will never exist without those forms.
• ViewWillAppear: I use ViewWillAppear usually just to update the data on
the form. So, for the example above, I would use this to actually load the
data from my domain into the form. Creation of UIViews is fairly
expensive, and you should avoid as much as possible doing that on the
ViewWillAppear method, becuase when this gets called, it means that the
iPhone is already ready to show the UIView to the user, and anything
heavy you do here will impact performance in a very visible manner (like
animations being delayed, etc).
•ViewDidAppear: Finally, I use the ViewDidAppear to start off new threads
to things that would take a long time to execute, like for example doing a
webservice call to get extra data for the form above.The good thing is that
because the view already exists and is being displayed to the user, you
can show a nice "Waiting" message to the user while you get the data.

17. View
Lifecycle

20. Lab
•Create
ViewController

21. Assignment
1- Searching for the following topics in Objective-C
1- NSARRAY - NSMutableArray
2- NSDictionary - NSMutableArray
3- Autolayout
4- How to make Button rounded border for add Button
2- Create an View Controller that can take the student name and save student object in data collection
like "NSMutableArray"
3- after press the save button a result label will display “Hello ” + name of the student
4- Create an method that can print tall the student names that have been entered before
5- Create a button in the screen that can preform the above action for print function loop for the enter
student name
6- Advanced task :
search for an UINavigation and how to use it to navigate form one screen to another

22. THANKS
▸ Skype : amr_elghadban
▸ Email : amr.elghadban@gmail.com
▸ Phone : (+20) 1098558500
▸ Fb/amr.elghadban
▸ Linkedin/amr_elghadban
▸ ios_course facebook group : https://www.facebook.com/groups/
1161387897317786/
WISH YOU WONDERFUL DAY