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A selector will be the system made use of to choose a technique to execute for an object, or maybe the exclusive identifier that replaces the identify once the supply code is compiled. A selector functions just like a dynamic functionality pointer that factors on the implementation of a class’ strategy.

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NSZombies just before publishing the app to the Application Shop. When NSZombies is enabled, no objects are introduced and you may be leaking memory continually till your app ultimately is killed on account of memory warnings.

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Q: Exactly what are some widespread leads to for very poor efficiency in scrolling table views? How can they be averted?

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The respondsToSelector: process returns a Boolean price that suggests whether or not the receiver implements or inherits a technique that could respond to a specified message.

A typical sample is to utilize respondsToSelector: to see if a delegate object implements an optional process ahead of sending it that information. For instance:

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In combination with NSError, iOS enhancement also has NSException. Compared with exceptions in other languages, NSException is meant to be used for programming mistakes only. Cocoa frameworks normally will not be exception-Risk-free, so in case you crank out (or invoke code that generates) exceptions, care ought to be taken to use test/catch as shut as is possible into the position exactly where the exception is occurring. In observe, NSException is rarely Employed in iOS codebases.