This document provides an overview of iPhone development for .NET developers. It discusses the tools needed like Xcode and the iOS SDK. It introduces Objective-C concepts like classes, methods, memory management using retain/release. It also covers view controllers, the model-view-controller pattern, and the iOS application lifecycle. The goal is to help .NET developers get started with iPhone development.

1. iPhone for .NET Developers
Ben Scheirman
Director of Development - ChaiONE
@subdigital
Tuesday, September 28, 2010

2. What you need
A Mac
Xcode
iPhone SDK (limited to Simulator)
iPhone Developer Program ($99 /year)
Tuesday, September 28, 2010

3. Objective-C
Based on C
Object Oriented
Dynamic
A little weird
Powerful
Tuesday, September 28, 2010

4. Objective-C Primer
Calling methods
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5. Objective-C Primer
Calling methods
[someObject someMethod];
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6. Objective-C Primer
Calling methods
[someObject someMethod];
[someObject someMethodWithInput:5];
Tuesday, September 28, 2010

7. Objective-C Primer
Calling methods
[someObject someMethod];
[someObject someMethodWithInput:5];
[dictionary setObject:obj
forKey:key];
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8. Objective-C Primer
Nesting method calls
Tuesday, September 28, 2010

9. Objective-C Primer
Nesting method calls
[NSString stringWithFormat:
[prefs format]];
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10. Objective-C Primer
Instantiating classes
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11. Objective-C Primer
Instantiating classes
UIView *view = [[UIView alloc] init];
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12. Objective-C Primer
Instantiating classes
UIView *view = [[UIView alloc] init];
NSDate *date = [NSDate date];
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13. Objective-C Primer
Defining Classes
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14. Objective-C Primer
Defining Classes
//Person.h
@interface Person {
//instance variables
}
//properties & methods
@end
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15. Objective-C Primer
Defining Classes
Tuesday, September 28, 2010

16. Objective-C Primer
Defining Classes
//Person.m
#import "Person.h"
@implementation Person
//implement properties & methods
@end
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17. Objective-C Primer
Defining Methods
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18. Objective-C Primer
Defining Methods
-(void)showLoadingText:(NSString *)text animated:(BOOL)animated;
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19. Objective-C Primer
Defining Methods
Method name (selector)
-(void)showLoadingText:(NSString *)text animated:(BOOL)animated;
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20. Objective-C Primer
Defining Methods
Method name (selector)
-(void)showLoadingText:(NSString *)text animated:(BOOL)animated;
Return Type
Tuesday, September 28, 2010

21. Objective-C Primer
Defining Methods
Method name (selector)
-(void)showLoadingText:(NSString *)text animated:(BOOL)animated;
Return Type
Instance method
Tuesday, September 28, 2010

22. Objective-C Primer
Defining Methods
Method name (selector)
-(void)showLoadingText:(NSString *)text animated:(BOOL)animated;
Return Type
Parameters
Instance method
Tuesday, September 28, 2010

23. Memory Management
No garbage collection on the iPhone
Retain / Release
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24. Memory Management
Retain / Release Dance
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25. Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
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26. Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
2
[foo retain];
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27. Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
2
[foo retain];
1
[foo release];
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28. Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
2
[foo retain];
1
[foo release];
[foo release]; 0
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29. Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
2
[foo retain];
1
[foo release];
[foo release]; foo is deallocated 0
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30. Getters / Setters
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31. Getters / Setters
[foo setBar:@"baz"];
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32. Getters / Setters
[foo setBar:@"baz"];
[foo bar]; //returns @"baz"
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33. Getters / Setters
[foo setBar:@"baz"];
[foo bar]; //returns @"baz"
foo.bar = @"gruul";
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34. Getters / Setters
[foo setBar:@"baz"];
[foo bar]; //returns @"baz"
foo.bar = @"gruul";
foo.bar //returns @"gruul"
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35. Implementing setters
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36. Implementing setters
-(void)setBar:(id)value {
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37. Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
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38. Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
if(bar != nil) {
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39. Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
if(bar != nil) {
[bar release];
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40. Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
if(bar != nil) {
[bar release];
bar = nil;
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41. Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
if(bar != nil) {
[bar release];
bar = nil;
}
Tuesday, September 28, 2010

42. Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
if(bar != nil) {
[bar release];
bar = nil;
}
if(value != nil)
Tuesday, September 28, 2010

43. Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
if(bar != nil) {
[bar release];
bar = nil;
}
if(value != nil)
bar = [value retain];
Tuesday, September 28, 2010

44. Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
if(bar != nil) {
[bar release];
bar = nil;
}
if(value != nil)
bar = [value retain];
}
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45. No Thanks
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46. Properties
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47. Properties
//Foo.h
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48. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
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49. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
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50. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
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51. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
@synthesize image, message;
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52. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
@synthesize image, message;
-(void)dealloc {
Tuesday, September 28, 2010

53. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
@synthesize image, message;
-(void)dealloc {
[image release];
Tuesday, September 28, 2010

54. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
@synthesize image, message;
-(void)dealloc {
[image release];
[message release];
Tuesday, September 28, 2010

55. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
@synthesize image, message;
-(void)dealloc {
[image release];
[message release];
[super dealloc];
Tuesday, September 28, 2010

56. Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
@synthesize image, message;
-(void)dealloc {
[image release];
[message release];
[super dealloc];
}
Tuesday, September 28, 2010

57. Dot Syntax Dogma
Use dot syntax if you like it
Just be aware of what it's hiding
Tuesday, September 28, 2010

58. Xcode
Your IDE
Code completion
Interactive Debugger
Lacks good refactoring tools
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59. Interface Builder
Drag-n-drop UI building
Layouts are defined in XIBs (XML representation).
Usually called "Nibs"
"Make connections" with classes defined in Xcode
variables --> UI components
UI events --> methods
Tuesday, September 28, 2010

60. Instruments
Find Memory Leaks
Analyze Memory Usage
Track down slow code
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61. iOS SDK
Accelerate CoreMotion
AddressBook CoreTelephony
AudioToolbox CoreText
Your app
AVFoundation CoreVideo
UIKit CoreAudio GameKit
CoreFoundation CoreData iAd
CoreGraphics CoreLocation MapKit
CFNetwork StoreKit
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62. Model View Controller
Model View
Controller
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63. The View Controller
Handles setup logic for a screen
Handles user input
Interacts with the model
Contains 1 or more views
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64. The View
Visual representation
Drawing
Laying out subviews (autorotation)
May Handle touch events
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65. Lifecycle of an App
main.m
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66. Lifecycle of an App
main.m
UIApplication
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67. Lifecycle of an App
main.m
UIApplication
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68. Lifecycle of an App
main.m MainWindow.xib
UIApplication
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69. Lifecycle of an App
main.m MainWindow.xib
UIApplication
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70. Lifecycle of an App
main.m MainWindow.xib
UIApplication YourAppDelegate
UIWindow Root View Controller
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71. Lifecycle of an App
main.m MainWindow.xib
UIApplication YourAppDelegate
applicationDidFinishLaunching
UIWindow Root View Controller
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72. Time to code!
Tuesday, September 28, 2010