Downloaded 63 times
![Objective-C Primer
Calling methods
[someObject someMethod];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-7-2048.jpg)
![Objective-C Primer
Calling methods
[someObject someMethod];
[someObject someMethodWithInput:5];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-8-2048.jpg)
![Objective-C Primer
Calling methods
[someObject someMethod];
[someObject someMethodWithInput:5];
[dictionary setObject:obj
forKey:key];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-9-2048.jpg)
![Objective-C Primer
Nesting method calls
[NSString stringWithFormat:
[prefs format]];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-11-2048.jpg)
![Objective-C Primer
Instantiating classes
UIView *view = [[UIView alloc] init];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-13-2048.jpg)
![Objective-C Primer
Instantiating classes
UIView *view = [[UIView alloc] init];
NSDate *date = [NSDate date];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-14-2048.jpg)
![Other interesting Things
nil is a no-op
Foo *foo = nil;
[foo doSomething]; //nothing happens
NSArray *array = nil;
[array count]; //returns 0](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-25-2048.jpg)
![Other Interesting Things
Mix-in C style method definitions
// I put this in Macros.h
static inline BOOL isEmpty(id thing) {
return thing == nil
|| ([thing respondsToSelector:@selector(length)]
&& [(NSData *)thing length] == 0)
|| ([thing respondsToSelector:@selector(count)]
&& [(NSArray *)thing count] == 0);
}
this method comes from Wil Shipley](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-26-2048.jpg)
![Other Interesting Things
Dynamic Programming achieved through Key-Value
Coding
NSArray *items = [NSArray arrayWithObject:foo];
[items valueForKey:@"count"]; //returns 1](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-27-2048.jpg)
![Other Interesting Things
Can achieve "Extension Methods" or "Mix-ins" via
Objective-C Categories
//NSString+MyAdditions.h
@interface NSString (MyAdditions)
-(NSString *)stringInReverse;
@end
//NSString+MyAdditions.m
@implementation NSString (MyAdditions)
-(NSString *)stringInReverse { ... }
@end
//usage
#import "NSString+MyAdditions.h"
[@"foxy" stringInReverse]; //returns @"yxof"](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-28-2048.jpg)
![Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-31-2048.jpg)
![Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
2
[foo retain];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-32-2048.jpg)
![Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
2
[foo retain];
1
[foo release];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-33-2048.jpg)
![Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
2
[foo retain];
1
[foo release];
[foo release]; 0](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-34-2048.jpg)
![Memory Management
Retain / Release Dance
1
Foo *foo = [[Foo alloc] init];
2
[foo retain];
1
[foo release];
[foo release]; foo is deallocated 0](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-35-2048.jpg)
![Getters / Setters
[foo setBar:@"baz"];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-48-2048.jpg)
![Getters / Setters
[foo setBar:@"baz"];
[foo bar]; //returns @"baz"](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-49-2048.jpg)
![Getters / Setters
[foo setBar:@"baz"];
[foo bar]; //returns @"baz"
foo.bar = @"gruul";](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-50-2048.jpg)
![Getters / Setters
[foo setBar:@"baz"];
[foo bar]; //returns @"baz"
foo.bar = @"gruul";
foo.bar //returns @"gruul"](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-51-2048.jpg)
![Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
[bar release];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-55-2048.jpg)
![Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
[bar release];
bar = nil;](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-56-2048.jpg)
![Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
[bar release];
bar = nil;
if(value != nil)](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-57-2048.jpg)
![Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
[bar release];
bar = nil;
if(value != nil)
bar = [value retain];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-58-2048.jpg)
![Implementing setters
-(void)setBar:(id)value {
if(bar == value) return;
[bar release];
bar = nil;
if(value != nil)
bar = [value retain];
}](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-59-2048.jpg)
![Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
@synthesize image, message;
-(void)dealloc {
[image release];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-68-2048.jpg)
![Properties
//Foo.h
@property (nonatomic, retain) UIImage *image;
@property (nonatomic, copy) NSString *message;
//Foo.m
@synthesize image, message;
-(void)dealloc {
[image release];
[message release];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-69-2048.jpg)
![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];](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-70-2048.jpg)
![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];
}](https://image.slidesharecdn.com/iphone-for-net-developers-110413095036-phpapp01/75/Objective-C-iPhone-for-NET-Developers-71-2048.jpg)
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Similar to Objective-C & iPhone for .NET Developers
Objective-C & iPhone for .NET Developers
- 1. iPhone for .NETDevelopers Ben Scheirman Director of Development - ChaiONE @subdigital
- 2. Slide 1 of429
- 4. What you need AMac Xcode iPhone SDK (limited to Simulator) iPhone Developer Program ($99 /year)
- 5. Objective-C Basedon C Object Oriented Dynamic A little weird Powerful
- 6. Objective-C Primer Callingmethods
- 7. Objective-C Primer Callingmethods [someObject someMethod];
- 8. Objective-C Primer Callingmethods [someObject someMethod]; [someObject someMethodWithInput:5];
- 9. Objective-C Primer Callingmethods [someObject someMethod]; [someObject someMethodWithInput:5]; [dictionary setObject:obj forKey:key];
- 10. Objective-C Primer Nestingmethod calls
- 11. Objective-C Primer Nestingmethod calls [NSString stringWithFormat: [prefs format]];
- 12.
- 13. Objective-C Primer Instantiatingclasses UIView *view = [[UIView alloc] init];
- 14. Objective-C Primer Instantiatingclasses UIView *view = [[UIView alloc] init]; NSDate *date = [NSDate date];
- 15. Objective-C Primer DefiningClasses
- 16. Objective-C Primer DefiningClasses //Person.h @interface Person { //instance variables } //properties & methods @end
- 17. Objective-C Primer DefiningClasses
- 18. Objective-C Primer DefiningClasses //Person.m #import "Person.h" @implementation Person //implement properties & methods @end
- 19. Objective-C Primer DefiningMethods
- 20. Objective-C Primer DefiningMethods -(void)showLoadingText:(NSString *)text animated:(BOOL)animated;
- 21. Objective-C Primer DefiningMethods Method name (selector) -(void)showLoadingText:(NSString *)text animated:(BOOL)animated;
- 22. Objective-C Primer DefiningMethods Method name (selector) -(void)showLoadingText:(NSString *)text animated:(BOOL)animated; Return Type
- 23. Objective-C Primer Defining Methods Method name (selector) -(void)showLoadingText:(NSString *)text animated:(BOOL)animated; Return Type Instance method
- 24. Objective-C Primer Defining Methods Method name (selector) -(void)showLoadingText:(NSString *)text animated:(BOOL)animated; Return Type Parameters Instance method
- 25. Other interesting Things nil is a no-op Foo *foo = nil; [foo doSomething]; //nothing happens NSArray *array = nil; [array count]; //returns 0
- 26. Other Interesting Things Mix-in C style method definitions // I put this in Macros.h static inline BOOL isEmpty(id thing) { return thing == nil || ([thing respondsToSelector:@selector(length)] && [(NSData *)thing length] == 0) || ([thing respondsToSelector:@selector(count)] && [(NSArray *)thing count] == 0); } this method comes from Wil Shipley
- 27. Other Interesting Things Dynamic Programming achieved through Key-Value Coding NSArray *items = [NSArray arrayWithObject:foo]; [items valueForKey:@"count"]; //returns 1
- 28. Other Interesting Things Can achieve "Extension Methods" or "Mix-ins" via Objective-C Categories //NSString+MyAdditions.h @interface NSString (MyAdditions) -(NSString *)stringInReverse; @end //NSString+MyAdditions.m @implementation NSString (MyAdditions) -(NSString *)stringInReverse { ... } @end //usage #import "NSString+MyAdditions.h" [@"foxy" stringInReverse]; //returns @"yxof"
- 29. Memory Management No garbagecollection on the iPhone Retain / Release
- 30. Memory Management Retain /Release Dance
- 31. Memory Management Retain/ Release Dance 1 Foo *foo = [[Foo alloc] init];
- 32. Memory Management Retain/ Release Dance 1 Foo *foo = [[Foo alloc] init]; 2 [foo retain];
- 33. Memory Management Retain/ Release Dance 1 Foo *foo = [[Foo alloc] init]; 2 [foo retain]; 1 [foo release];
- 34. Memory Management Retain/ Release Dance 1 Foo *foo = [[Foo alloc] init]; 2 [foo retain]; 1 [foo release]; [foo release]; 0
- 35. Memory Management Retain/ Release Dance 1 Foo *foo = [[Foo alloc] init]; 2 [foo retain]; 1 [foo release]; [foo release]; foo is deallocated 0
- 36. Forgetting to release(over-retaining) Your Class
- 37. Forgetting to release(over-retaining) 1 alloc/init Your Object Class
- 38. Forgetting to release(over-retaining) 2 1 alloc/init retain Your Object Class
- 39. Forgetting to release(over-retaining) 2 1 alloc/init retain Your doSomething Object Class
- 40. Forgetting to release(over-retaining) 1 alloc/init retain Your doSomething Object Class release
- 41. Forgetting to release(over-retaining) 1 Object
- 42. Forgetting to release(over-retaining) 1 Object Object is leaked App doesn't crash
- 43.
- 44. Over-releasing 1 alloc/init Your Object Class
- 45. Over-releasing alloc/init release Your Garbage Class Memory
- 46. Over-releasing alloc/init release Your Garbage Class doSomething Memory App Crashes
- 47.
- 48. Getters / Setters [foosetBar:@"baz"];
- 49. Getters / Setters [foosetBar:@"baz"]; [foo bar]; //returns @"baz"
- 50. Getters / Setters [foosetBar:@"baz"]; [foo bar]; //returns @"baz" foo.bar = @"gruul";
- 51. Getters / Setters [foosetBar:@"baz"]; [foo bar]; //returns @"baz" foo.bar = @"gruul"; foo.bar //returns @"gruul"
- 52.
- 53.
- 54. Implementing setters -(void)setBar:(id)value { if(bar == value) return;
- 55. Implementing setters -(void)setBar:(id)value { if(bar == value) return; [bar release];
- 56. Implementing setters -(void)setBar:(id)value { if(bar == value) return; [bar release]; bar = nil;
- 57. Implementing setters -(void)setBar:(id)value { if(bar == value) return; [bar release]; bar = nil; if(value != nil)
- 58. Implementing setters -(void)setBar:(id)value { if(bar == value) return; [bar release]; bar = nil; if(value != nil) bar = [value retain];
- 59. Implementing setters -(void)setBar:(id)value { if(bar == value) return; [bar release]; bar = nil; if(value != nil) bar = [value retain]; }
- 60.
- 61.
- 62.
- 63. Properties //Foo.h @property (nonatomic, retain)UIImage *image;
- 64. Properties //Foo.h @property (nonatomic, retain)UIImage *image; @property (nonatomic, copy) NSString *message;
- 65. Properties //Foo.h @property (nonatomic, retain)UIImage *image; @property (nonatomic, copy) NSString *message; //Foo.m
- 66. Properties //Foo.h @property (nonatomic, retain)UIImage *image; @property (nonatomic, copy) NSString *message; //Foo.m @synthesize image, message;
- 67. Properties //Foo.h @property (nonatomic, retain)UIImage *image; @property (nonatomic, copy) NSString *message; //Foo.m @synthesize image, message; -(void)dealloc {
- 68. Properties //Foo.h @property (nonatomic, retain)UIImage *image; @property (nonatomic, copy) NSString *message; //Foo.m @synthesize image, message; -(void)dealloc { [image release];
- 69. Properties //Foo.h @property (nonatomic, retain)UIImage *image; @property (nonatomic, copy) NSString *message; //Foo.m @synthesize image, message; -(void)dealloc { [image release]; [message release];
- 70. 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];
- 71. 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]; }
- 72. Dot Syntax Dogma Use dot syntax if you like it Just be aware of what it's hiding
- 73. Xcode Your IDE Code completion InteractiveDebugger Lacks good refactoring tools
- 74. Interface Builder NowPart of Xcode 4 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
- 75. Instruments Find MemoryLeaks Analyze Memory Usage Track down slow code
- 76. iOS SDK Accelerate CoreMotion AddressBook CoreTelephony AudioToolbox CoreText Your app AVFoundation CoreVideo UIKit CoreAudio GameKit CoreFoundation CoreData iAd CoreGraphics CoreLocation MapKit CFNetwork StoreKit
- 77. Model View Controller Model View Controller
- 78. The View Controller Handles setup logic for a screen Handles user input Interacts with the model Contains 1 or more views
- 79. The View Visual representation Drawing Layingout subviews (autorotation) May Handle touch events
- 80. Lifecycle of anApp main.m
- 81. Lifecycle of anApp main.m UIApplication
- 82. Lifecycle of anApp main.m UIApplication
- 83. Lifecycle of anApp main.m MainWindow.xib UIApplication
- 84. Lifecycle of anApp main.m MainWindow.xib UIApplication
- 85. Lifecycle of anApp main.m MainWindow.xib UIApplication YourAppDelegate UIWindow Root View Controller
- 86. Lifecycle of anApp main.m MainWindow.xib UIApplication YourAppDelegate applicationDidFinishLaunching UIWindow Root View Controller
- 87.
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