ios键盘高度

- (void)viewDidLoad
{
[super viewDidLoad];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
[[NSNotificationCenter defaultCenter]removeObserver:self];
}
-(void)keyboardWillShow:(NSNotification*)notification{

NSDictionary*info=[notification userInfo];
CGSize kbSize=[[info objectForKey:UIKeyboardFrameEndUserInfoKey]CGRectValue].size;
//
NSValue *animationDurationValue = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];

NSTimeInterval animationDuration;

[animationDurationValue getValue:&animationDuration];
NSLog(@"keyboard changed, keyboard width = %f, height = %f,animationDuration =%f",

kbSize.width,kbSize.height,animationDuration);

}