1.監(jiān)聽鍵盤

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

- (void)keyboardWillShow:(NSNotification *)notification{
    //取得鍵盤最后的frame
    CGRect keyboardFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat height = keyboardFrame.origin.y;
    
}