Modal View Controller无法正确旋转

Question

On the ipad, in ios objective C, I am having problems with the rotation moves in one modal view. I give the position of the element in the shouldAutoRotate method and its parent view can rotate too, but when I rotate the modal view the elements don't put in the correct place.

For more information, if I open the view in portrait mode I get this data:

<UIView: 0x72bc160; frame = (0 0; 768 1004); clipsToBounds = YES; 
autoresize = W+H; layer = <CALayer: 0x13f324f0>

And in landscape mode:

<UIView: 0x1358f3b0; frame = (0 0; 768 748); clipsToBounds = YES; 
autoresize = W+H; layer = <CALayer: 0x1358f3e0>>

But if I rotate the view the horizontal frame changes by vertical frame...

Am I doing something wrong?

Answer 1

I've had a lot of fun with view controller rotation. There are two things to keep in mind:

1. Assuming you're covering the entire screen (and don't do anything specific with subview transformation), make sure you are presenting the modal view controller from the broadest possible view controller, often the root view controller of the application.
2. Make sure every conceptual containing view controller passes along the rotation events to its conceptual child view controllers. (This was very ill-defined pre-iOS 5.)

When these things happened to me, it was because the view controllers in the background got the rotation events, but the particular view controller I was presenting from was ignoring them and not passing them along to the modal view controller, leading to inconsistency.