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A standard sample is to use respondsToSelector: to check out if a delegate item implements an optional method prior to sending it that concept. Such as:

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Employing a technique that can take an NSError implies utilizing an optional variable (a variable that might or might not exist) and the unwrapping the error if it exists.

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In distinction, the Swift bridge removes the initWith syntax and modifies the formatting automatically to your Swift syntax as follows:

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Q: What is the delegate sample and what is it used for? Explain the delegates used by a UITableView.