Convert UIKeyboardFrameEndUserInfoKey to View or Window Coordinates

Question

For the constant UIKeyboardFrameEndUserInfoKey, in the Apple docs it says:

These coordinates do not take into account any rotation facto

Answer 1

I tried the accepted answer and found that it does not actually provide the CGRect of the keyboard within the view. I found that I have to convert the CGRect from the UIScreen object to the UIWindow object, and from the UIWindow object to the UIView object:

NSValue * keyboardEndFrame;
CGRect    screenRect;
CGRect    windowRect;
CGRect    viewRect;

// determine's keyboard height
screenRect    = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
windowRect    = [self.view.window convertRect:screenRect fromWindow:nil];
viewRect      = [self.view        convertRect:windowRect fromView:nil];

I use the above to resize the root view to not be hidden by the keyboard:

NSTimeInterval  duration;
CGRect          frame;

// determine length of animation
duration  = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

// resize the view
frame              = self.view.frame;
frame.size.height -= viewRect.size.height;

// animate view resize with the keyboard movement
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:duration];
self.view.frame = frame;
[UIView commitAnimations];