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A typical pattern is to work with respondsToSelector: to see if a delegate object implements an optional approach before sending it that message. Such as:
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Solutions are invoked by sending them a message. Below’s an example of sending a message to a myUser item:
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NSOperationQueue. NSOperationQueue is a straightforward API that determines how many things can run at the same time, then goes and does them. It allows you limit the volume of functions jogging concurrently (e.
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