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Cocoa Design Patterns Stewart Gleadow February 2010

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Timeline 1976 1980 1986 1988 1996 2000 2007 2011 Apple iPhoneOriginal Objective C acquires maniaSmalltalk NeXT NeXT & OS X Mac Commerically NeXTSTEP & app licensed Cocoa store Smalltalk Objective C 2.0

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CObjective C

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Objective C SyntaxDefinition:- (void)textDidChangeFrom:(NSString *)old to:(NSString *)newText;{}Calling:[textField textDidChangeFrom:@”old text” to:@”new text”];

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Template MVC Enumerators Proxy Method Targets & Flyweight Singleton Delegates Actions ResponderNotifications Hierarchies Invocations Chain

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Template MVC Enumerators Iterator Proxy Method Targets & Flyweight Singleton Delegates Actions Responder Chain ofNotifications Hierarchies Obser ver Composite Responsibility Invocations Command Chain

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Template MVC Enumerators Iterator Proxy Method Targets & Flyweight Singleton Delegates Actions Responder Chain ofNotifications Hierarchies Obser ver Composite Responsibility Invocations Command Chain

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Template MethodMyView.h#import <UIKit/UIKit.h>@interface MyView : UIView{ // instance variables go here}@end

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Template MethodMyView.m#import "MyView.h"@implementation MyView- (void)drawRect:(CGRect)rect;{ // Drawing code.}@end

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Delegate@protocol TTURLRequestDelegate <NSObject> @optional- (void)requestDidStartLoad:(TTURLRequest*)request;- (void)requestDidFinishLoad:(TTURLRequest*)request;@end

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Delegate@implementation MyDelegate- (void)requestDidStartLoad:(TTURLRequest*)request;{ // start loading indicator?}- (void)requestDidFinishLoad:(TTURLRequest*)request;{ // stop loading indicator // do something awesome}@end

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DelegateTTURLRequest *request;request = [TTURLRequest requestWithURL:url delegate:myDelegate];

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Targets & ActionsUIButton *addButton;addButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];[button addTarget:myButtonReceiver action:@selector(addButtonWasPressed:) forControlEvents:UIControlEventTouchUpInside];

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Enumerator

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Proxy

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Flyweight

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Singleton[[UIApplication sharedApplication] delegate];

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Notifications & Invocations

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More?• Cocoa Design Patterns, by Erik M. Buck, Donald A.Yacktman• (Advanced) Cocoa Programming for Mac OS X - Aaron Hillegass• Apple Developer Docs (http:// developer.apple.com)• CocoaHeads (http:// groups.google.com/group/ cocoaheadsau)

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Stewart Gleadow Thoughtworkssgleadow@thoughtworks.com @stewgleadow