The chance to Verify dynamically at runtime if a category supports a method might be significantly handy with delegates (see the subsequent query With this manual) that will have optional methods a developer can choose to put into action or not.

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to acquire a concept of external parameter names (a expression borrowed from Swift), but this is not the case. In the above mentioned example, the tactic staying referred to as needs to have forDuration: plus an accompanying parameter, and it have to

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NSError objects have an error domain, an error code, and consumer details dictionary For added information. This extra information and facts might contain, by way of example, a localized description and Restoration suggestion, so afterwards code can Exhibit that into the person.

a method (from its superclass) by sending respondsToSelector: to the thing utilizing the Tremendous search term. Sending respondsToSelector: to super is reminiscent of sending it to self. Rather, you ought to use the instancesRespondToSelector: system on the item’s superclass, as an example:

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A typical reason behind exc_bad_access problems that aren't detectable through the compiler is seeking to obtain produced objects. In these cases, enabling NSZombies in Xcode could be a powerful debugging strategy. Enabling NSZombies retains objects that will Usually be released alive as “zombies”.

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