Objective-C Categories | Envato Tuts+Categories provide the ability to add functionality to an object without subclassing or changing the actual object. A handy tool, they are often used to add methods to existing classes, such as NSString or your own custom objects. Step 1: Set Up Your Project Launch Xcode and click File > New > Project. Choose an iOS Single View Application from the window and click "Next." Name your product "Categ
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