interface declares the behavior of class and implementation defines the behavior of class.
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Lazy Instantiation (initialisation ) , this technique is good if you have an object that only needs to be configured once and has some co...
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provides a mechanism for broadcasting information within a program, using notification we can send message to other object by adding obser...
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use [ self . view endEditing : YES ]; it will dismiss keypad
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watchkit app on watch and watchkit extension on iphone. choosing the scene on watchkit app, WatchKit tells the paired iPhone to launch ...
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NSAutoreleasePool:- The NSAutoreleasePool class is used to support Cocoa’s reference-counted memory management system. An autor...
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When variable is marked with __block , the modifications done inside the block are also visible outside of it.
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Grand Central Dispatch (GCD) comprises language features, runtime libraries, and system enhancements that provide systemic, compre...
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View Controllers are the link between data and view(visual appearance). Whenever iOS displays anything on screen it is managed by the View...
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Prototype Pattern Its a creational design pattern. Its normally used to create duplicate objects. This pattern is used normally when th... -
Abstract Factory Pattern Its a creational design pattern. It's extension to factory method. It creates more level of abstraction t...
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