As mentioned in Apple’s Cocoa Developer’s Manual, “the main worth of delegation is usually that it means that you can simply customise the behavior of numerous objects in one central item”.

. When an object is in use by A different object it’s retain depend goes up; when It's not getting used by any objects, its retain count reverts to zero.

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A common sample is to make use of respondsToSelector: to view if a delegate object implements an optional method ahead of sending it that information. By way of example:

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exc_bad_access problems are a common prevalence that can frustrate rookie iOS builders as a result of insufficient handy debugging information and facts that they supply. They usually manifest when attempting to entry an item which was never initialized or has by now been produced.

Q: What exactly is a selector and what's its purpose? Give an illustration of exactly where And just how it'd be utilized.

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