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Pat Zearfoss

The document provides an overview of options for iOS development including HTML5, cross-platform frameworks like Titanium and PhoneGap, and native iOS development using Objective-C. HTML5 allows using existing web technologies but has limited hardware access and cross-browser issues. Cross-platform frameworks provide better hardware access but compatibility may vary. Native development using Objective-C offers the most control and best performance but only works on iOS. Xcode is used for native iOS development. An introduction to Objective-C covers classes, methods, and basic syntax similar to C with object-oriented additions.

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iOS Development
iOS Development • About Me: • Pat Zearfoss • Mindgrub Technologies, LLC • BS Computer Science - UMBC 2008 • Working with mobile and iOS for 3 years.
iOS Development • Web: pzearfoss@gmail.com http://zearfoss.wordpress.com @pzearfoss http://www.github.com/pzearfoss
Development Options
Development Options HTML 5
Development Options HTML 5 Cross Platform
Development Options HTML 5 Cross Platform Native
HTML 5
HTML 5 • Use the technologies you already know.
HTML 5 • Use the technologies you already know. • Can be loaded into an app webview and distributed on the app store.
HTML 5 • Use the technologies you already know. • Can be loaded into an app webview and distributed on the app store. • Limited use of device hardware.
HTML 5 • Use the technologies you already know. • Can be loaded into an app webview and distributed on the app store. • Limited use of device hardware. • Cross Platform
HTML 5 • Use the technologies you already know. • Can be loaded into an app webview and distributed on the app store. • Limited use of device hardware. • Cross Platform • Except for all the cross browser problems you already know and love.
Cross Platform Frameworks
Cross Platform Frameworks • Titanium, PhoneGap, Others
Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know.
Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code.
Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code. • PhoneGap uses web code in a webview.
Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code. • PhoneGap uses web code in a webview. • Better use of device hardware.
Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code. • PhoneGap uses web code in a webview. • Better use of device hardware. • “Cross Platform”
Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code. • PhoneGap uses web code in a webview. • Better use of device hardware. • “Cross Platform” • Your mileage may vary.
Native
Native • Offers the most control over your product.
Native • Offers the most control over your product. • Access to all device frameworks.
Native • Offers the most control over your product. • Access to all device frameworks. • Requires Objective-C
Native • Offers the most control over your product. • Access to all device frameworks. • Requires Objective-C • Only runs on iOS (obviously)
Native • Offers the most control over your product. • Access to all device frameworks. • Requires Objective-C • Only runs on iOS (obviously) • Will generally run with the absolute best performance.
Xcode • Download from App Store $4.99 Download
Xcode • Download from App Store $4.99 Download
Xcode • Download from App Store $4.99 Download 4.1 is now free
Getting Started
Getting Started • Things you should know
Getting Started • Things you should know • Classical OO
Getting Started • Things you should know • Classical OO • Classes
Getting Started • Things you should know • Classical OO • Classes • Inheritance
Getting Started • Things you should know • Classical OO • Classes • Inheritance • Polymorphism
Getting Started
Getting Started • Recommended but not required
Getting Started • Recommended but not required • Some knowledge of C
Getting Started • Recommended but not required • Some knowledge of C • malloc() . . . free() ?
Getting Started • Recommended but not required • Some knowledge of C • malloc() . . . free() ? • Some knowledge of design patterns:
Getting Started • Recommended but not required • Some knowledge of C • malloc() . . . free() ? • Some knowledge of design patterns: • MVC, Singleton, Delegation
Objective-C in 10 minutes
About Objective-C
About Objective-C • Object Oriented superset over C
About Objective-C • Object Oriented superset over C Standard C
About Objective-C • Object Oriented superset over C Standard C Objective-C
About Objective-C • Object Oriented superset over C Standard C Objective-C • Anything that works in C will work in Objective-C
Obj-C in 10 minutes
Obj-C in 10 minutes • All the things you know from C
Obj-C in 10 minutes • All the things you know from C • Variables are typed:
Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char
Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char int foo = 5;
Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char int foo = 5; • Separate compilation
Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char int foo = 5; • Separate compilation • .h for interface declaration
Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char int foo = 5; • Separate compilation • .h for interface declaration • .m for implementation (instead of .c)
Obj-C in 10 minutes
Obj-C in 10 minutes • Functions / Methods have return types and typed arguments
Obj-C in 10 minutes • Functions / Methods have return types and typed arguments int sumOfItems(int i, int j) { return i + j; }
Obj-C in 10 minutes • Functions / Methods have return types and typed arguments int sumOfItems(int i, int j) { return i + j; } • Other types
Obj-C in 10 minutes • Functions / Methods have return types and typed arguments int sumOfItems(int i, int j) { return i + j; } • Other types • void, NULL
Obj-C in 10 minutes • Functions / Methods have return types and typed arguments int sumOfItems(int i, int j) { return i + j; } • Other types • void, NULL • pointers to types (int *, void *)
Obj-C in 10 minutes
Obj-C in 10 minutes • Objective-C Additions:
Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO
Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO BOOL isSet = YES;
Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO BOOL isSet = YES; • id - strictly a pointer to an object
Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO BOOL isSet = YES; • id - strictly a pointer to an object • nil - a zero’d out pointer
Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO BOOL isSet = YES; • id - strictly a pointer to an object • nil - a zero’d out pointer • nil != (necessarily) NULL or 0
Obj-C in 10 minutes
Obj-C in 10 minutes • Classes
Obj-C in 10 minutes • Classes • Exist as a class pair
Obj-C in 10 minutes • Classes • Exist as a class pair • Instance variables and instance methods act on an instance object
Obj-C in 10 minutes • Classes • Exist as a class pair • Instance variables and instance methods act on an instance object • Class (static) methods act on the class object
Obj-C in 10 minutes • Classes • Exist as a class pair • Instance variables and instance methods act on an instance object • Class (static) methods act on the class object • There is only ever one class object at any given time
Obj-C in 10 minutes • Classes • Exist as a class pair • Instance variables and instance methods act on an instance object • Class (static) methods act on the class object • There is only ever one class object at any given time • Class variables really don’t exist
Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
Obj-C in 10 minutes • Classes Include a header #import <Foundation/Foundation.h> file @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> Declare interface @interface MyClass : NSObject extends { NSObject id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; Class instance NSArray *someItems; variables } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } A class (static) + (NSString *)className; - (void)logMe; method @property (nonatomic, retain) id aChildObject; @end
Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; An instance method @property (nonatomic, retain) id aChildObject; @end
Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } A declared + (NSString *)className; property - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; Close the @end interface block
Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Classes Include a header #import "MyClass.h" file @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Classes #import "MyClass.h" Begin @implementation MyClass implementation @synthesize aChildObject; block - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass Auto-generate @synthesize aChildObject; property - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init Initializer { (constructor) self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { Call to super self = [super init]; if (self) class { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; “new” an array if (self) { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); } @end
Obj-C in 10 minutes • Continued . . . - (void)dealloc { Destructor [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); } @end
Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe Instance method { implementation NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); } @end
Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); Class method } implementation + (NSString *)className { return NSStringFromClass([self class]); } @end
Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); End } implementation @end block
Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); } @end
Obj-C in 10 minutes
Obj-C in 10 minutes • What’s with all the ‘@’ and ‘[ ]’?
Obj-C in 10 minutes • What’s with all the ‘@’ and ‘[ ]’? •@ • Objective-C keywords • Initializer for string constants
Obj-C in 10 minutes • What’s with all the ‘@’ and ‘[ ]’? •@ • Objective-C keywords • Initializer for string constants • ‘[]’ • “Send a message to an object” • Like calling a method, but more dynamic
Obj-C in 10 minutes
Obj-C in 10 minutes • Method Calls (messages)
Obj-C in 10 minutes • Method Calls (messages) • Names are intermixed with arguments:
Obj-C in 10 minutes • Method Calls (messages) • Names are intermixed with arguments: • method definition - (void)setItems:(NSArray *)items childObject:(id)obj;
Obj-C in 10 minutes • Method Calls (messages) • Names are intermixed with arguments: • method definition - (void)setItems:(NSArray *)items childObject:(id)obj; • method call [self setItems:[NSArray array] childObject:object];
Obj-C in 10 minutes - (void)setItems:(NSArray *)items childObject:(id)obj;
Obj-C in 10 minutes Return Type - (void)setItems:(NSArray *)items childObject:(id)obj;
Obj-C in 10 minutes Return Type - (void)setItems:(NSArray *)items childObject:(id)obj; Method Name
Obj-C in 10 minutes Return Type Arguments and Types - (void)setItems:(NSArray *)items childObject:(id)obj; Method Name
Obj-C in 10 minutes [self setItems:[NSArray array] childObject:object];
Obj-C in 10 minutes Receiver [self setItems:[NSArray array] childObject:object];
Obj-C in 10 minutes Receiver [self setItems:[NSArray array] childObject:object]; Method Name
Obj-C in 10 minutes Receiver Arguments [self setItems:[NSArray array] childObject:object]; Method Name
Obj-C in 10 minutes
Obj-C in 10 minutes • Protocols
Obj-C in 10 minutes • Protocols • Analogous to interfaces @protocol MyProtocol <NSObject> - (void)protocolMethod; @property (nonatomic, retain) NSObject *anObject; @end
Obj-C in 10 minutes • Protocols • Analogous to interfaces @protocol MyProtocol <NSObject> - (void)protocolMethod; @property (nonatomic, retain) NSObject *anObject; @end • Adopting a protocol @interface MyClass : NSObject <MyProtocol>
Obj-C in 10 minutes • Categories - Something completely different • Add functionality to an existing class @interface NSString (firstChar) - (unichar)firstChar; @end @implementation NSString (reverse) - (unichar)firstChar { return [self characterAtIndex:0]; } @end
Xcode Tour • Located in /Developer/Applications
Frederick web meetup slides
Code Editor
Navigator
Utilities
Debug Area
Run Controls
Status Window (???)
Window Configuration
Frederick web meetup slides
Run Controls Status Window (???) Window Configuration Navigator Code Editor Utilities Debug Area
Hello World
Model-View-Controller
Model-View-Controller Model
Model-View-Controller Model View
Model-View-Controller Model Controller View
Model • Defines the data to be displayed in a view. • Model objects • Database Model • Web
Controller • Negotiates communication between the model and the view. • Controls presentation logic • Updates the model Controller • Reflects those updates on the view
View • Contains controls and UI Widgets • Informs the controller of updates. View
Hello World Model Controller View (Hello_WorldViewController) (.xib) Label view
Hello World Model Controller View (Hello_WorldViewController) (.xib) Label view
Hello World Model Controller View (Hello_WorldViewController) (.xib) Label view
Hello You
Hello You • Basic string handling • Button control • TextField control • Outlets and Actions • Basic MVC
Hello You Model Controller View (HelloYouViewController) (.xib) NSString: name view textField textField label label buttonTap: button
Locations
Locations • CoreLocation • UITableview • Delegate Pattern
HTML Photo
HTML App • Shows interaction between webview content and the native development kit. • Modal View Controllers • UIImagePickerController
The HTML <html> <head> <meta name = "viewport" content = "width = device-width"> </head> <body> <h1>Tap for photo</h1> <input type="button" value="Get Photo" onClick="window.location='http://getphoto'"/> <img width="320" height="200" id="image"/> </body> </html>
The JavaScript var image=document.getElementById('image'); image.src = '%@' • %@ will be replaced by the image url
Loading the webview NSError *error; NSString *filename = [[NSBundle mainBundle] pathForResource:@"webview" ofType:@"html"]; NSString *html = [NSString stringWithContentsOfFile:filename encoding:NSUTF8StringEncoding error:&error]; [webview loadHTMLString:html baseURL:nil];
Intercepting the URL - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { if ([[[request URL] absoluteString] isEqualToString:@"http://getphoto/"]) { UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.modalPresentationStyle = UIModalTransitionStyleCoverVertical; picker.delegate = self; [self presentModalViewController:picker animated:YES]; return NO; } return YES; }
iOS Development • Web: pzearfoss@gmail.com http://zearfoss.wordpress.com @pzearfoss http://www.github.com/pzearfoss

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Frederick web meetup slides

  • 2. iOS Development • About Me: • Pat Zearfoss • Mindgrub Technologies, LLC • BS Computer Science - UMBC 2008 • Working with mobile and iOS for 3 years.
  • 3. iOS Development • Web: [email protected] http://zearfoss.wordpress.com @pzearfoss http://www.github.com/pzearfoss
  • 6. Development Options HTML 5 Cross Platform
  • 7. Development Options HTML 5 Cross Platform Native
  • 9. HTML 5 • Use the technologies you already know.
  • 10. HTML 5 • Use the technologies you already know. • Can be loaded into an app webview and distributed on the app store.
  • 11. HTML 5 • Use the technologies you already know. • Can be loaded into an app webview and distributed on the app store. • Limited use of device hardware.
  • 12. HTML 5 • Use the technologies you already know. • Can be loaded into an app webview and distributed on the app store. • Limited use of device hardware. • Cross Platform
  • 13. HTML 5 • Use the technologies you already know. • Can be loaded into an app webview and distributed on the app store. • Limited use of device hardware. • Cross Platform • Except for all the cross browser problems you already know and love.
  • 15. Cross Platform Frameworks • Titanium, PhoneGap, Others
  • 16. Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know.
  • 17. Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code.
  • 18. Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code. • PhoneGap uses web code in a webview.
  • 19. Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code. • PhoneGap uses web code in a webview. • Better use of device hardware.
  • 20. Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code. • PhoneGap uses web code in a webview. • Better use of device hardware. • “Cross Platform”
  • 21. Cross Platform Frameworks • Titanium, PhoneGap, Others • Use the technologies you already know. • Titanium generates native code. • PhoneGap uses web code in a webview. • Better use of device hardware. • “Cross Platform” • Your mileage may vary.
  • 23. Native • Offers the most control over your product.
  • 24. Native • Offers the most control over your product. • Access to all device frameworks.
  • 25. Native • Offers the most control over your product. • Access to all device frameworks. • Requires Objective-C
  • 26. Native • Offers the most control over your product. • Access to all device frameworks. • Requires Objective-C • Only runs on iOS (obviously)
  • 27. Native • Offers the most control over your product. • Access to all device frameworks. • Requires Objective-C • Only runs on iOS (obviously) • Will generally run with the absolute best performance.
  • 28. Xcode • Download from App Store $4.99 Download
  • 29. Xcode • Download from App Store $4.99 Download
  • 30. Xcode • Download from App Store $4.99 Download 4.1 is now free
  • 32. Getting Started • Things you should know
  • 33. Getting Started • Things you should know • Classical OO
  • 34. Getting Started • Things you should know • Classical OO • Classes
  • 35. Getting Started • Things you should know • Classical OO • Classes • Inheritance
  • 36. Getting Started • Things you should know • Classical OO • Classes • Inheritance • Polymorphism
  • 39. Getting Started • Recommended but not required • Some knowledge of C
  • 40. Getting Started • Recommended but not required • Some knowledge of C • malloc() . . . free() ?
  • 41. Getting Started • Recommended but not required • Some knowledge of C • malloc() . . . free() ? • Some knowledge of design patterns:
  • 42. Getting Started • Recommended but not required • Some knowledge of C • malloc() . . . free() ? • Some knowledge of design patterns: • MVC, Singleton, Delegation
  • 43. Objective-C in 10 minutes
  • 45. About Objective-C • Object Oriented superset over C
  • 46. About Objective-C • Object Oriented superset over C Standard C
  • 47. About Objective-C • Object Oriented superset over C Standard C Objective-C
  • 48. About Objective-C • Object Oriented superset over C Standard C Objective-C • Anything that works in C will work in Objective-C
  • 49. Obj-C in 10 minutes
  • 50. Obj-C in 10 minutes • All the things you know from C
  • 51. Obj-C in 10 minutes • All the things you know from C • Variables are typed:
  • 52. Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char
  • 53. Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char int foo = 5;
  • 54. Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char int foo = 5; • Separate compilation
  • 55. Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char int foo = 5; • Separate compilation • .h for interface declaration
  • 56. Obj-C in 10 minutes • All the things you know from C • Variables are typed: • int, float, double, char int foo = 5; • Separate compilation • .h for interface declaration • .m for implementation (instead of .c)
  • 57. Obj-C in 10 minutes
  • 58. Obj-C in 10 minutes • Functions / Methods have return types and typed arguments
  • 59. Obj-C in 10 minutes • Functions / Methods have return types and typed arguments int sumOfItems(int i, int j) { return i + j; }
  • 60. Obj-C in 10 minutes • Functions / Methods have return types and typed arguments int sumOfItems(int i, int j) { return i + j; } • Other types
  • 61. Obj-C in 10 minutes • Functions / Methods have return types and typed arguments int sumOfItems(int i, int j) { return i + j; } • Other types • void, NULL
  • 62. Obj-C in 10 minutes • Functions / Methods have return types and typed arguments int sumOfItems(int i, int j) { return i + j; } • Other types • void, NULL • pointers to types (int *, void *)
  • 63. Obj-C in 10 minutes
  • 64. Obj-C in 10 minutes • Objective-C Additions:
  • 65. Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO
  • 66. Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO BOOL isSet = YES;
  • 67. Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO BOOL isSet = YES; • id - strictly a pointer to an object
  • 68. Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO BOOL isSet = YES; • id - strictly a pointer to an object • nil - a zero’d out pointer
  • 69. Obj-C in 10 minutes • Objective-C Additions: • BOOL - YES / NO BOOL isSet = YES; • id - strictly a pointer to an object • nil - a zero’d out pointer • nil != (necessarily) NULL or 0
  • 70. Obj-C in 10 minutes
  • 71. Obj-C in 10 minutes • Classes
  • 72. Obj-C in 10 minutes • Classes • Exist as a class pair
  • 73. Obj-C in 10 minutes • Classes • Exist as a class pair • Instance variables and instance methods act on an instance object
  • 74. Obj-C in 10 minutes • Classes • Exist as a class pair • Instance variables and instance methods act on an instance object • Class (static) methods act on the class object
  • 75. Obj-C in 10 minutes • Classes • Exist as a class pair • Instance variables and instance methods act on an instance object • Class (static) methods act on the class object • There is only ever one class object at any given time
  • 76. Obj-C in 10 minutes • Classes • Exist as a class pair • Instance variables and instance methods act on an instance object • Class (static) methods act on the class object • There is only ever one class object at any given time • Class variables really don’t exist
  • 77. Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
  • 78. Obj-C in 10 minutes • Classes Include a header #import <Foundation/Foundation.h> file @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
  • 79. Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> Declare interface @interface MyClass : NSObject extends { NSObject id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
  • 80. Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; Class instance NSArray *someItems; variables } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
  • 81. Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } A class (static) + (NSString *)className; - (void)logMe; method @property (nonatomic, retain) id aChildObject; @end
  • 82. Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; An instance method @property (nonatomic, retain) id aChildObject; @end
  • 83. Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } A declared + (NSString *)className; property - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
  • 84. Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; Close the @end interface block
  • 85. Obj-C in 10 minutes • Classes #import <Foundation/Foundation.h> @interface MyClass : NSObject { id aChildObject; NSArray *someItems; } + (NSString *)className; - (void)logMe; @property (nonatomic, retain) id aChildObject; @end
  • 86. Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
  • 87. Obj-C in 10 minutes • Classes Include a header #import "MyClass.h" file @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
  • 88. Obj-C in 10 minutes • Classes #import "MyClass.h" Begin @implementation MyClass implementation @synthesize aChildObject; block - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
  • 89. Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass Auto-generate @synthesize aChildObject; property - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
  • 90. Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init Initializer { (constructor) self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
  • 91. Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
  • 92. Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { Call to super self = [super init]; if (self) class { someItems = [[NSArray alloc] init]; } return self; }
  • 93. Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; “new” an array if (self) { someItems = [[NSArray alloc] init]; } return self; }
  • 94. Obj-C in 10 minutes • Classes #import "MyClass.h" @implementation MyClass @synthesize aChildObject; - (id)init { self = [super init]; if (self) { someItems = [[NSArray alloc] init]; } return self; }
  • 95. Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); } @end
  • 96. Obj-C in 10 minutes • Continued . . . - (void)dealloc { Destructor [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); } @end
  • 97. Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe Instance method { implementation NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); } @end
  • 98. Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); Class method } implementation + (NSString *)className { return NSStringFromClass([self class]); } @end
  • 99. Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); End } implementation @end block
  • 100. Obj-C in 10 minutes • Continued . . . - (void)dealloc { [aChildObject release]; [someItems release]; [super dealloc]; } - (void)logMe { NSLog(@"MyClass"); } + (NSString *)className { return NSStringFromClass([self class]); } @end
  • 101. Obj-C in 10 minutes
  • 102. Obj-C in 10 minutes • What’s with all the ‘@’ and ‘[ ]’?
  • 103. Obj-C in 10 minutes • What’s with all the ‘@’ and ‘[ ]’? •@ • Objective-C keywords • Initializer for string constants
  • 104. Obj-C in 10 minutes • What’s with all the ‘@’ and ‘[ ]’? •@ • Objective-C keywords • Initializer for string constants • ‘[]’ • “Send a message to an object” • Like calling a method, but more dynamic
  • 105. Obj-C in 10 minutes
  • 106. Obj-C in 10 minutes • Method Calls (messages)
  • 107. Obj-C in 10 minutes • Method Calls (messages) • Names are intermixed with arguments:
  • 108. Obj-C in 10 minutes • Method Calls (messages) • Names are intermixed with arguments: • method definition - (void)setItems:(NSArray *)items childObject:(id)obj;
  • 109. Obj-C in 10 minutes • Method Calls (messages) • Names are intermixed with arguments: • method definition - (void)setItems:(NSArray *)items childObject:(id)obj; • method call [self setItems:[NSArray array] childObject:object];
  • 110. Obj-C in 10 minutes - (void)setItems:(NSArray *)items childObject:(id)obj;
  • 111. Obj-C in 10 minutes Return Type - (void)setItems:(NSArray *)items childObject:(id)obj;
  • 112. Obj-C in 10 minutes Return Type - (void)setItems:(NSArray *)items childObject:(id)obj; Method Name
  • 113. Obj-C in 10 minutes Return Type Arguments and Types - (void)setItems:(NSArray *)items childObject:(id)obj; Method Name
  • 114. Obj-C in 10 minutes [self setItems:[NSArray array] childObject:object];
  • 115. Obj-C in 10 minutes Receiver [self setItems:[NSArray array] childObject:object];
  • 116. Obj-C in 10 minutes Receiver [self setItems:[NSArray array] childObject:object]; Method Name
  • 117. Obj-C in 10 minutes Receiver Arguments [self setItems:[NSArray array] childObject:object]; Method Name
  • 118. Obj-C in 10 minutes
  • 119. Obj-C in 10 minutes • Protocols
  • 120. Obj-C in 10 minutes • Protocols • Analogous to interfaces @protocol MyProtocol <NSObject> - (void)protocolMethod; @property (nonatomic, retain) NSObject *anObject; @end
  • 121. Obj-C in 10 minutes • Protocols • Analogous to interfaces @protocol MyProtocol <NSObject> - (void)protocolMethod; @property (nonatomic, retain) NSObject *anObject; @end • Adopting a protocol @interface MyClass : NSObject <MyProtocol>
  • 122. Obj-C in 10 minutes • Categories - Something completely different • Add functionality to an existing class @interface NSString (firstChar) - (unichar)firstChar; @end @implementation NSString (reverse) - (unichar)firstChar { return [self characterAtIndex:0]; } @end
  • 123. Xcode Tour • Located in /Developer/Applications
  • 133. Run Controls Status Window (???) Window Configuration Navigator Code Editor Utilities Debug Area
  • 138. Model-View-Controller Model Controller View
  • 139. Model • Defines the data to be displayed in a view. • Model objects • Database Model • Web
  • 140. Controller • Negotiates communication between the model and the view. • Controls presentation logic • Updates the model Controller • Reflects those updates on the view
  • 141. View • Contains controls and UI Widgets • Informs the controller of updates. View
  • 142. Hello World Model Controller View (Hello_WorldViewController) (.xib) Label view
  • 143. Hello World Model Controller View (Hello_WorldViewController) (.xib) Label view
  • 144. Hello World Model Controller View (Hello_WorldViewController) (.xib) Label view
  • 146. Hello You • Basic string handling • Button control • TextField control • Outlets and Actions • Basic MVC
  • 147. Hello You Model Controller View (HelloYouViewController) (.xib) NSString: name view textField textField label label buttonTap: button
  • 151. HTML App • Shows interaction between webview content and the native development kit. • Modal View Controllers • UIImagePickerController
  • 152. The HTML <html> <head> <meta name = "viewport" content = "width = device-width"> </head> <body> <h1>Tap for photo</h1> <input type="button" value="Get Photo" onClick="window.location='http://getphoto'"/> <img width="320" height="200" id="image"/> </body> </html>
  • 153. The JavaScript var image=document.getElementById('image'); image.src = '%@' • %@ will be replaced by the image url
  • 154. Loading the webview NSError *error; NSString *filename = [[NSBundle mainBundle] pathForResource:@"webview" ofType:@"html"]; NSString *html = [NSString stringWithContentsOfFile:filename encoding:NSUTF8StringEncoding error:&error]; [webview loadHTMLString:html baseURL:nil];
  • 155. Intercepting the URL - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { if ([[[request URL] absoluteString] isEqualToString:@"http://getphoto/"]) { UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.modalPresentationStyle = UIModalTransitionStyleCoverVertical; picker.delegate = self; [self presentModalViewController:picker animated:YES]; return NO; } return YES; }
  • 156. iOS Development • Web: [email protected] http://zearfoss.wordpress.com @pzearfoss http://www.github.com/pzearfoss

Editor's Notes