当出发键盘的时候，出发监听
//键盘监测
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(kWillShow:)name:UIKeyboardWillShowNotificationobject:nil];
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(kWillHide:)name:UIKeyboardWillHideNotificationobject: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
}