Objective-C Design Pattern

Please look at the http://www.oodesign.com/

Creational Patterns

*Abstract Factory
Creates an instance of several families of classes *

NSObject Objective-C class methods are sometimes call factory methods. This pattern is intrinsic to the Objective-C language. Every Objective C class is potentially an abstract factory. This pattern is also used to implement CocoaClassClusters. SubClass">ShouldClassClusterPlaceholderBeASubClasshttp://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Builder Separates object construction from its representation *

NSDocumentManager? � Builds NSDocument instances with NSWindowManager(s), handles recent documents menu, builds document related responder chain� NSApplication? � Builds main menu, initial responder chain, run loop�

*Factory Method Creates an instance of several derived classes *

Objective-C class methods are sometimes call factory methods. This pattern is intrinsic to the Objective-C language. NSObject ClassClusters. SubClass">ShouldClassClusterPlaceholderBeASubClasshttp://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/index.html

*Prototype A fully initialized instance to be copied or cloned *

NSCell is a Prototype when used with NSMatrix.

*Singleton A class of which only a single instance can exist *

SingletonDesignPattern SingletonAlternatives NSApplication NSNull NSFileManager NSWorkspace http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaObjects/Articles/CreateSingleton.html http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaObjects/Articles/ObjectCreation.html

Structural Patterns

*Adapter Match interfaces of different classes *

http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Bridge Separates an object�s interface from its implementation *

*Composite A tree structure of simple and composite objects *

http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.htmlWrappingIsBad

*Decorator Add responsibilities to objects dynamically *

http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Facade A single class that represents an entire subsystem *

NSImage - NSText and NSTextView encapsulate the functionality of complex text layout and editing which is internally implement with NSTextStorage, NSLayoutManager, and other classes.

http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Flyweight A fine-grained instance used for efficient sharing * NSCell

*Proxy An object representing another object *

http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

Behavioral Patterns

*Chain of Resp. A way of passing a request between a chain of objects *

http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Command Encapsulate a command request as an object *

http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Interpreter A way to include language elements in a program *

Value Transformers?

*Iterator Sequentially access the elements of a collection *

NSEnumerator http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Mediator Defines simplified communication between classes *

NSObjectController, NSArrayController, NSTreeController, and NSUserDefaultsController http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Memento Capture and restore an object's internal state *

NSCoder NSKeyedArchiver and NSKeyUnarchiver http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Observer A way of notifying change to a number of classes *

NSNotificationCenterhttp://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*State Alter an object's behavior when its state changes *

*Strategy Encapsulates an algorithm inside a class *

NSLayoutMananger NSFormatter?

*TemplateMethod Defer the exact steps of an algorithm to a subclass *

http://developer.apple.com/documentation/Cocoa/Conceptual/DesignPatterns">CocoaDesignPatterns/index.html

*Visitor Defines a new operation to a class without change *

Cocoa Unique Patterns

*Target/Action A variation/simplification of the Command pattern *

NSControl NSActionCell @selector Similar to Qt Signals & Slots

*Method Swizzling A technique for runtime modification of the relationship between message selectors and the implementation that will be called in response to a message *

MethodSwizzling

*Delegation Enable one object to control, modify, or specialize the behavior of another object through a loosely coupled interface.