Utilizing a method that will take an NSError suggests making use of an optional variable (a variable that might or might not exist) and also the unwrapping the mistake if it exists. We comprehend convey an attractive and visually beautiful iPad application is no youngster’s play. It require

A selector could be the mechanism utilized to select a method to execute for an item, or maybe the exclusive identifier that replaces the identify if the source code is compiled. A selector acts similar to a dynamic purpose pointer that factors for the implementation of a class’ strategy. W

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