Applying a way that takes an NSError indicates applying an optional variable (a variable that might or might not exist) and the unwrapping the mistake if it exists.

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A category is a way to extend an existing class and is particularly an alternative to the use of subclasses. The principle difference concerning subclassing and groups is the fact a classification provides operation to an existing class itself which is then available anyplace inside your code tha

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Though an experienced developer needs to have a fair understanding of both equally Objective-C and Swift programming languages.

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