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Category The Category pattern adds methods to existing classes and provides an alternative to subclassing in many situations. The added methods are inherited by all subclasses of the extended class and are indistinguishable at runtime from methods originally compiled into the class. Unlike subclasses, categories can’t be used to add instance variables to an existing class, however the Associative Storage pattern provides a way to simulate the existence of additional instance variables within a category implementation. © 2011, FuGenX <strong>Technologies</strong> Confidential 26
Category We use the Category pattern to accomplish the following: - Extend existing classes without subclassing. - Create informal protocols. - Implement different methods of the same class in different frameworks. - Spread the implementation of individual classes across multiple source files. - Simplify development when multiple programmers contribute to the definition of individual classes. © 2011, FuGenX <strong>Technologies</strong> Confidential 27
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Page 3 and 4: Model View controller - Example �
Page 5 and 6: NSObject � NSObject is a base cla
Page 7 and 8: NSObject Methods � init - Initial
Page 9 and 10: Over-riding Base Class Methods �
Page 11 and 12: Two Stage Creation � The Two-Stag
Page 13 and 14: Two - Stage Creation Due to so many
Page 15 and 16: Two - Stage Creation Zones Memory z
Page 17 and 18: Two - Stage creation � Regardless
Page 19 and 20: Default Template Methods Template M
Page 21 and 22: Template Method When You Should Cal
Page 23 and 24: NSObject Template Methods Template
Page 25: Dynamic Creation The basis of this
Page 29 and 30: Category @implementation NSMutableA
Page 31 and 32: Singleton � The Singleton pattern
Page 33 and 34: Singleton Creating and Accessing a
Page 35 and 36: Singleton A basic implementation of
Page 37 and 38: + (id)new { return [self alloc]; }
Page 39 and 40: Deallocation Singleton + (void)atte
Page 41 and 42: Delegates � A delegate is an obje
Page 43 and 44: Delegates © 2011, FuGenX Technolog
Page 45 and 46: Delegates Slider © 2011, FuGenX Te
Page 47 and 48: @implementation Controller Delegate
Page 49 and 50: Delegates @protocol ModelDelegate
Page 51 and 52: Delegates @protocol SliderDelegate
Page 53: Thank You © 2011, FuGenX Technolog

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