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IOS Technical Test MCQs

What is the difference between assign and retain in Objective-C?

assign - Specifies that a copy of the object should be used for assignment. The previous value is sent a release message. retain - Specifies that the setter uses simple assignment. The previous value is sent a release message.

assign - Specifies that the setter uses simple assignment. This is the default. retain - Specifies that retain should be invoked on the object upon assignment. The previous value is sent a release message.

assign - Increases the count of an object by 1. Takes ownership of an object. retain - Decreases the retain count of an object by 1. Relinquishes ownership of an object.

assign - Makes a assign of an object, and returns it with retain count of 1. If you copy an object, you own the copy. retain - Specifies that a retain of the object should be used for assignment. The previous value is sent a release message.

Answer

Correct Answer: assign - Specifies that the setter uses simple assignment. This is the default. retain - Specifies that retain should be invoked on the object upon assignment. The previous value is sent a release message.

Explanation:

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