“Incorrect” frame / window size after re-orientation in iPhone

Question

In my iPhone OS application I want (need) to watch for changes in the device orientation in order to rearrange certain portions of the screen. The approach I used was to use

Answer 1

I've been stumbling over the same problem and with some diagnostic work I discovered that the view's bounds and frame do not accurately reflect the landscape orientation in viewDidLoad (when the device is held in landscape when the view controller is pushed onto the stack), but do so correctly in viewWillAppear: and viewDidAppear:. I just moved my code that needed the dimensions of the frame/bounds from viewDidLoad to viewWillAppear:, and it worked properly.

Answer 2

Use self.view.bounds instead.

Answer 3

The orientation of your device changed, not the physical characteristics of the screen. You basically tipped it on its side, but in reality it is 320 pixels wide (20 of which are not available to you at the moment since the status bar is showing) and 480 pixels tall. If your view is auto-rotating, then the width/height have been translated for you, but when you ask for the actual dimensions of the screen, you get back the actual dimensions of the screen.

This is also why, when working with translated views, it is important to do calculations based on the view's center and the view's bounds and never on the view's frame.