Question

I am trying to add another subview programmatically based on some event (user taps a button, for instance).

My problem is that I am having problems referencing the (one and only) instance of UIWindow. I reach it from my appDelegate, because the MainWindow.xib and the appDelegate have been wired up. But I cannot reach the UIWIndow from anywhere else (I cannot draw that connection in IB, can I?)

What techniwue is preferred to get a reference to (the one and only) UIWindow? …so that I in turn can use the following code from my various UIViewControllers:

[myOneAndOnlyWindow addSubview:oneOfManyViews.view];
[myOneAndOnlyWindow makeKeyAndVisible];

Answer 1

You can retrieve pointer to the key window of your application after call
[UIApplication sharedApplication].keyWindow
Window becomes key after you call
[window makeKeyAndVisible]