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Possible Duplicate:
@property @synthesize
When must I use property and synthesize for an element as NSArray, NSSTring….or IBOutelt as UIButton or UITextFiled?
A property is used mainly when other objects need to change or access the ivars in your object. Without manually defining getters and setters, or using @property, other objects can’t see or change the ivars. Properties are also often used for convenience of memory management, assisting you in preventing memory leaks.