As said in Apple’s Cocoa Developer’s Tutorial, “the principle worth of delegation is it enables you to very easily personalize the habits of a number of objects in a single central object”.
NSError objects have an mistake domain, an error code, and person info dictionary For added details. This additional information and facts may possibly consist of, by way of example, a localized description and recovery suggestion, so later on code can display that for the consumer.
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A typical pattern is to implement respondsToSelector: to discover if a delegate object implements an optional system before sending it that message. By way of example:
Equally languages can be utilized in the identical task, because of bridging header files that Xcode mechanically creates involving The 2 languages.
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