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添加监听(最好放在ViewWillAppear里, 在视图将要消失时移除监听)

这里监听键盘Frame的变化而不是监听键盘的显示和隐藏

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardFrameChange:) name:UIKeyboardWillChangeFrameNotification object:nil];

#pragma mark - 键盘Frame改变时调用-(void)keyboardFrameChange:(NSNotification *)note{    CGFloat durtion = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];    CGRect frame = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];    if (frame.origin.y == self.view.frame.size.height)    {        // 没有弹出键盘        [UIView animateWithDuration:durtion animations:^{            _toolBar.transform = CGAffineTransformIdentity;        }];    }    else    {        // 弹出键盘        // 工具条向上移动键盘的高度        [UIView animateWithDuration:durtion animations:^{            _toolBar.transform = CGAffineTransformMakeTranslation(0, -frame.size.height);        }];    }}

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