Properties in Objective C [duplicate]

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Atomic vs nonatomic properties

I am a beginner in objective-c. Can you tell me what is the function of following line in the code:

@property(nonatomic , retain) UITextField   *userName;

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This creates a property called userName of type UITextField for instances of whatever class this code is in. The (nonatomic, retain) code tells the compiler that the property will be retained every time it is accessed, and to make it thread-safe (nonatomic).

If the property is implemented with an @synthsize command, the compiler will create getter and setter methods for you, and it will make sure the getter retains your property.

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