In the old days of programming, you had to write code to create your user interface and then create your actual program. With Xcode, you can create your user interface without writing any code at all. However, to make your program do something, you’ll still need to write code. Although you can theoretically use any programming language to create a Mac program, the language used most often (even by Apple’s programmers themselves) for this task is Objective-C.
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