Using a way that requires an NSError indicates making use of an optional variable (a variable that might or might not exist) and the unwrapping the error if it exists.
a method (from its superclass) by sending respondsToSelector: to the thing utilizing the super search phrase. Sending respondsToSelector: to Tremendous is equivalent to sending it to self. As a substitute, you ought to utilize the instancesRespondToSelector: technique on the article’s superclass, such as:
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Q: Exactly what is the delegate sample and what's it used for? Describe the delegates utilized by a UITableView.
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