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In a Navigation-based application, the method pushViewController:animated can be used. This is a method of the UINavigationController class. However, nowhere in the source files do I see any #import statements that import this class. The documentation doesn’t show UIViewController as inheriting from UINavigationController.
So how are Navigation-based applications able to access this method?
UIViewController has a property called
navigationControllerwhich is an instance of aUINavigationController. This is how it gets access to it.