cocoa touch - UIScreen applicationFrame returning incorrect rectangle on landscape application launch (iPhone/iPad)

Question

Having trouble getting the correct bounds for my iPad application when launching it in landscape mode. I have the proper keys set in my Info.plist file, and my view controllers launch properly in landscape (and portrait, natch).

In my applicationDidFinishLaunching: method I'm calling a selector after a 3 second delay, and that method makes a call to [[UIScreen mainScreen] applicationFrame], but it's returning me a portrait frame (ie height > width).

Does anyone know how to fix this? It smells like a bug to me (if so I'll file a radar), but if it's intended behaviour, where is it documented?

Answer 1

I never rely on [[UIScreen mainScreen] applicationFrame], especially during app launch.

When creating views in code, use the superview to set your frame.

If you're using xibs with "simulated interface elements" they will be correctly sized and everything will work great.

UINavigationController based apps

In the case of a UINavigationController based app, grab the frame directly from self.navigationController.view, don't try to use [self loadView] and self.view.superview. UINavigationController uses "hidden" subviews to do it's job--so the direct superview will not work.

UINavigationController is special because during app launch, the navigation controller resizes your views after loadView gets called. When autoresizing kicks in you end up with a small margin at the bottom of the screen.

Why not UIScreen

[[UIScreen mainScreen] applicationFrame] doesn't work reliably (especially during app launch in landscape). My experience is that the viewcontroller's interfaceOrientation property will not match the applicationFrame orientation.