How to detect only when keyboard is being shown? - iphone

Question

I wanted my UIView to animate to a new position when the keyboard was shown, so used the UIKeyboardWillShowNotification and UIKeyboardWillChangeFrameNotification. The problem is that when the device is rotated without the keyboard, the view has autoresizing and rotates as it should - it looks perfect.
Unfortunately, with the keyboard displayed, rotating the device sends those notifications and thus performing a UIView animation in response gives it an odd animation. It could best be described as looking like it jumps into a new position and is then anchored round by a corner to the new orientation. Perhaps you know what I'm talking about.
Is there any way for me to detect when the device is rotating or otherwise deal with the problem when rotating when the keyboard is being shown?

Answer 1

For orientation-change detection use the UIDeviceOrientationDidChangeNotification.

Answer 2

I guess the following code will help you..
#property(nonatomic,strong)BOOL keyBoardShow;
- (void)viewDidLoad
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillBeShown:)
name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
[super viewDidLoad];
}
-(void)keyboardWillBeShown:(NSNotification *)aNotification {
keyBoardShow = YES;
}
-(void)keyboardWillBeHidden:(NSNotification *)aNotification {
keyBoardShow = NO;
}
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if (keyBoardShow) {
// Do the needful when the keyboard is shown
}else{
}
}
Just set bool value in keyboardWillBeShown and keyboardWillBeHidden delegate methods. And do your uiview position in willRotateToInterfaceOrientation.

Answer 3

Instead of relying on the built-in notifications, why don't you instead rely on what's triggering the keyboard showing in the first place? I'm guessing the keyboard pops up when a particular UITextField becomes the first responder. You should be able to use that.
Register a delegate for that UITextField and implement -textFieldDidBeginEditing:. The delegate should be a view controller. Then, to keep things loosely coupled, post your own notification from the delegate and have your view registered for that.
It's a bit more work, but it gives you much better control.
- (void)textFieldDidBeginEditing:(UITextField *)textField
Apple documentation: UITextFieldDelegate Protocol