![]() Generics in Objective-C are a contentious issue you will see both styles. NSMutableArray *items = NSMutableArray *results = Let score = 556 let name = "Taylor" let firstRun = true ![]() Var score = 556 var name = "Taylor" var loggedIn = falseĬonst NSInteger score = 556 NSString * const name = const BOOL firstRun = YES Ĭonstants are used infrequently in Objective-C. NSInteger score = 556 NSString *name = BOOL loggedIn = NO Variables and constants Create a variable If you can already program in Swift and want to get up to speed with Objective-C as quickly as possible, I have just the book for you: Objective-C for Swift Developers. Where necessary I have added small clarification notes to give you more understanding. In all instances, Objective-C code is shown on the left and the equivalent Swift code on the right. Well, that's exactly what you'll find below: a Rosetta stone of Apple development, demonstrating variables, collections, functions, classes, and more. If you're moving from Objective-C to Swift, or perhaps from Swift to Objective-C, it can be useful to have a quick start guide showing equivalent code samples in both languages.
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