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A fantastic illustration of delegation is the UITableView object that is usually applied when a desk is rendered to the screen. The UITableView employs two unique delegates:
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Concurrency means two or even more tasks are outlined independently. Three ways to obtain concurrency in iOS are - Threads, Dispatch queues and Procedure queues.
This manual offers a sampling of effective thoughts that will help Appraise the breadth and depth of a prospect's mastery with the iOS System.
Q: Explain using methods and messages in Objective-C. Examine some of the benefits and drawbacks of this method.
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A common sample is to implement respondsToSelector: to view if a delegate item implements an optional strategy just before sending it that information. For instance:
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. When an item is in use by One more item it’s retain depend goes up; when It's not at all being used by any objects, its keep count reverts to zero.
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