1、新建类AddTagToolbar，在需要弹出的控制器里，控制AddTagToolbar的高度

- (void)setupToolbar{
    AddTagToolbar *toolbar = [AddTagToolbar viewFromXib];
    toolbar.width = self.view.width;
    toolbar.y = self.view.height - toolbar.height;
    [self.view addSubview:toolbar];
    self.toolbar = toolbar;
    
    [QFMNotiCenter addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
// 监听键盘的弹出和隐藏
- (void)keyboardWillChangeFrame:(NSNotification *)noti{
    // 键盘最终的frame
    CGRect keyboradF = [noti.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat duration = [noti.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
    [UIView animateWithDuration:duration animations:^{
        self.toolbar.transform = CGAffineTransformMakeTranslation(0, keyboradF.origin.y-SCREEN_HEIGHT);
    }];
}