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A standard pattern is to employ respondsToSelector: to find out if a delegate item implements an optional process prior to sending it that message. For instance:
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A selector may be the mechanism utilised to select a way to execute for an item, or the exclusive identifier that replaces the identify when the supply code is compiled. A selector functions similar to a dynamic perform pointer that details towards the implementation of a category’ process.
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. When an item is in use by A different object it’s keep rely goes up; when It is far from being used by any objects, its keep count reverts to zero.
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