2. What is advantage of categories?
What is difference between implementing a category and inheritance?
You can add method to existing class even to that class whose source is not available to you.
You can extend functionality of a class without subclassing.
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3. What is the difference between @interface and @implementation in iOS?
It’s a keyword used to declare the Class.
It’s a keyword used to define the Class.
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4.Which JSON framework is supported by iOS?
SBJson framework is supported by iOS.
It is a JSON parser and generator for Objective-C.
SBJson provides flexible APIs and additional control that makes JSON handling easier.
From iOS 5 Onwards we are using NSJSONSerialization inherited from NSObject Base class.
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5. What is the purpose of UIWindow object?
The presentation of one or more views on a screen is coordinated by UIWindow object.
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