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copied!<p>Here is the Abstract factory implementation for Objective C.</p> <pre><code>// Usage BrandingFactory * factory = [BrandingFactory factory:Sierra]; UIView * view = [factory brandedView]; UIButton * button = [factory brandedMainButton]; UIToolbar * toolbar = [factory brandedToolbar]; ____________________________________________ // BrandingFactory.h // AbstractFactory #import <Foundation/Foundation.h> typedef enum ouputTypes { Acme, Sierra } OutputTypes; @interface BrandingFactory : NSObject { } + (BrandingFactory *) factory: (OutputTypes)type; - (UIView *) brandedView; - (UIButton *) brandedMainButton; - (UIToolbar *) brandedToolbar; @end ___________________________________________________ // BrandingFactory.m // AbstractFactory #import "BrandingFactory.h" #import "AcmeBrandingFactory.h" #import "SierraBrandingFactory.h" @implementation BrandingFactory + (BrandingFactory *) factory:(OutputTypes)type { if (type == Sierra) { return [[[SierraBrandingFactory alloc] init] autorelease]; } else if (type == Acme) { return [[[AcmeBrandingFactory alloc] init] autorelease]; } return nil; } - (UIView *) brandedView { return nil; } - (UIButton *) brandedMainButton { return nil; } - (UIToolbar *) brandedToolbar { return nil; } @end ________________________________________ // SierraBrandingFactory.h // AbstractFactory #import <Foundation/Foundation.h> #import "BrandingFactory.h" @interface SierraBrandingFactory : BrandingFactory { } - (UIView*) brandedView; - (UIButton*) brandedMainButton; - (UIToolbar*) brandedToolbar; @end // SierraBrandingFactory.m // AbstractFactory #import "SierraBrandingFactory.h" #import "SierraView.h" #import "SierraMainButton.h" #import "SierraToolbar.h" @implementation SierraBrandingFactory - (UIView*) brandedView { // returns a custom view for Sierra return [[[SierraView alloc] init] autorelease]; } - (UIButton*) brandedMainButton { // returns a custom main button for Sierra return [[[SierraMainButton alloc] init] autorelease]; } - (UIToolbar*) brandedToolbar { // returns a custom toolbar for Sierra return [[[SierraToolbar alloc] init] autorelease]; } @end ________________________________________ // AcmeBrandingFactory.h // AbstractFactory #import <Foundation/Foundation.h> #import "BrandingFactory.h" @interface AcmeBrandingFactory : BrandingFactory { } - (UIView *) brandedView; - (UIButton *) brandedMainButton; - (UIToolbar *) brandedToolbar; @end // AcmeBrandingFactory.m // AbstractFactory #import "AcmeBrandingFactory.h" #import "AcmeView.h" #import "AcmeMainButton.h" #import "AcmeToolbar.h" @implementation AcmeBrandingFactory - (UIView *) brandedView { // returns a custom view for Acme return [[[AcmeView alloc] init] autorelease]; } - (UIButton *) brandedMainButton { // returns a custom main button for Acme return [[[AcmeMainButton alloc] init] autorelease]; } - (UIToolbar *) brandedToolbar { // returns a custom toolbar for Acme return [[[AcmeToolbar alloc] init] autorelease]; } @end </code></pre>

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