开发笔记——检测键盘的弹出与消失

来源：互联网发布：java架构师工作编辑：程序博客网时间：2024/05/17 05:50

iOS开发中经常遇到要检测键盘的高度并做相应的偏移动画的场景，再次仅做记录，在需要的时候直接copy即可

1.添加监听：（一般情况下只需监听键盘将要弹出和将要隐藏的方法即可）

/*     UIKeyboardWillChangeFrameNotification键盘的frame将要发生改变时发出的通知（位置和尺寸）     UIKeyboardDidChangeFrameNotification键盘的frame发生改变时发出的通知（位置和尺寸）     UIKeyboardWillShowNotification键盘将要弹出     UIKeyboardDidShowNotification键盘弹出时     UIKeyboardWillHideNotification键盘将要隐藏     UIKeyboardDidHideNotification键盘已经隐藏     */        //监听键盘将要弹出    [[NSNotificationCenter defaultCenter] addObserver:self                                             selector:@selector(keyboardWillShow:)                                                 name:UIKeyboardWillShowNotification                                               object:nil];    //增加监听，当键退出时收出消息    [[NSNotificationCenter defaultCenter] addObserver:self                                             selector:@selector(keyboardWillHide:)                                                 name:UIKeyboardWillHideNotification                                               object:nil];

2.添加监听方法：

//键盘将要弹出-(void)keyboardWillShow:(NSNotification *)sender{    //获取键盘的高度    NSDictionary *userInfo = [sender userInfo];    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];    CGRect keyboardRect = [aValue CGRectValue];    CGFloat height = keyboardRect.size.height;        }//键盘将要隐藏-(void)keyboardWillHide:(NSNotification *)sender{   }

3.在delloc方法中移除监听

//移除监听-(void)dealloc{    [[NSNotificationCenter defaultCenter] removeObserver:UIKeyboardWillShowNotification];    [[NSNotificationCenter defaultCenter] removeObserver:UIKeyboardWillHideNotification];}

0 0