NSOperationQueue. NSOperationQueue is a simple API that decides how many things can operate simultaneously, then goes and does them. It permits you Restrict the volume of operations running concurrently (e.
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A typical sample is to use respondsToSelector: to view if a delegate object implements an optional method prior to sending it that message. One example is:
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A selector is the system employed to select a way to execute for an object, or the special identifier that replaces the name when the source code is compiled. A selector functions similar to a dynamic functionality pointer that details for the implementation of a class’ technique.
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