Add a UIView above all, even the navigation bar

You can do that by adding your view directly to the keyWindow:

UIView *myView = /* <- Your custom view */;
UIWindow *currentWindow = [UIApplication sharedApplication].keyWindow;
[currentWindow addSubview:myView];

UPDATE -- For Swift 4.1 and above

let currentWindow: UIWindow? = UIApplication.shared.keyWindow
currentWindow?.addSubview(myView)

UPDATE for iOS13 and above

keyWindow is deprecated. You should use the following:

UIApplication.shared.windows.first(where: { $0.isKeyWindow })?.addSubview(myView)

[self.navigationController.view addSubview:overlayView]; is what you really want

Here is a simple elegant solution that is working for me. You can set the z position of the navigation bar to below the view:

self.navigationController.navigationBar.layer.zPosition = -1;

Just remember to set it back to 0 when done.

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