A very strange obstacle to overcome when you just get started with iOS or macOS programming is to use custom views or view controllers. How does this magic even work? And what do the steps mean that you have to perform? When you use a Xcode template, you get a Storyboard or a Xib with the most important components for an initial, empty app to display something on screen. This is accompanied by an
AppDelegate and a custom
ViewController class. If you don't know anything and just get started developing for iOS, say, then this is a good place to start hacking away: after all, the bare-bones infrastructure has been handled for you.
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