Using a technique that normally takes an NSError means employing an optional variable (a variable that may or may not exist) along with the unwrapping the error if it exists.
An excellent example of delegation would be the UITableView item that is typically utilised whenever a desk is rendered ov
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Q: How will you Verify dynamically at runtime to discover if a class supports a technique that may reply to a particular message?
The selector could possibly be utilized having an instance of every in the courses to invoke its run method, even though the implementation may be really distinct for
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