iOS 获取键盘高度

当出发键盘的时候，出发监听

//键盘监测

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

    [[NSNotificationCenter
defaultCenter]addObserver:self
selector:@selector(kWillHide:)
name:UIKeyboardWillHideNotification
object:nil];

2.

#pragma mark Keyboard

-(void)kWillShow:(NSNotification *)noti{

   

    CGRect kbEndFram = [noti.userInfo[UIKeyboardFrameEndUserInfoKey]
CGRectValue];

    CGFloat Height = kbEndFram.size.height;

    

  

}

-(void)kWillHide:(NSNotification *)noti{

   消失，，，为 0 

}