A common sample is to make use of respondsToSelector: to determine if a delegate item implements an optional method prior to sending it that information. As an example:
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Just after enabling NSZombies, you can then follow what is going on within your code and get a concept when the applying attempts to access an item that's been introduced, thus identifying the trouble within your code. A Observe of warning while: You'll want to make sure to disable
Q: How are you going to check dynamically at runtime to view if a class supports a technique that could reply to a particular message?
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Overly intricate view hierarchies. Although you can use the varied UIViews to generate tailor made cells, this has the probable to degrade general performance whether it is overused or receives extremely advanced. Though this is becoming significantly less of a problem Along with the growing velocity of supported iOS units, it nevertheless can impact scrolling performance in a few units and eventualities.