iOS 监听键盘的弹出，收起，并且拿到键盘的高度

监听当键盘将要出现时

OC版

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

[[NSNotificationCenter defaultCenter]addObserver:selfselector:@selector(keyboardWillHide:)name:UIKeyboardWillHideNotification object:nil];

- (void)keyboardWillShow:(NSNotification *)notification

{

//    //获取键盘的高度

//    NSDictionary *userInfo = [notification userInfo];

//    NSValue *value = [userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey];

//    CGRect keyboardRect = [value CGRectValue];

//    int height = keyboardRect.size.height;

    CGFloatcurkeyBoardHeight = [[[notificationuserInfo]objectForKey:@"UIKeyboardBoundsUserInfoKey"]CGRectValue].size.height;

          CGRectbegin = [[[notificationuserInfo]objectForKey:@"UIKeyboardFrameBeginUserInfoKey"]CGRectValue];

          CGRectend = [[[notificationuserInfo]objectForKey:@"UIKeyboardFrameEndUserInfoKey"]CGRectValue];

          // 第三方键盘回调三次问题，监听仅执行最后一次

        if(begin.size.height>0&& (begin.origin.y-end.origin.y>0)){

             CGFloatkeyBoardHeight = curkeyBoardHeight;

             NSLog(@"第三次：%f",keyBoardHeight);

             [UIView  animateWithDuration:0.05 animations:^{

                 self.countLb_bottomH.constant= keyBoardHeight+10*sizeScale;

             }];

        }

}

- (void)keyboardWillHide:(NSNotification*)notificationswift版

{

    //获取键盘的高度

    NSDictionary*userInfo = [notificationuserInfo];

    NSValue *value = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

    CGRectkeyboardRect = [valueCGRectValue];

    intheight = keyboardRect.size.height;

    self.countLb_bottomH.constant = 12*sizeScale;

}

 NotificationCenter.default.addObserver(self,selector:#selector(keyBoardShow(noty:)),name:Notification.Name.UIKeyboardWillShow,object:nil)

NotificationCenter.default.addObserver(self,selector:#selector(keyBoardHidden(noty:)),name:Notification.Name.UIKeyboardWillHide,object:nil)

@objcfunckeyBoardShow(noty:Notification){guardletuserInfo=noty.userInfoelse{return}letvalue=userInfo["UIKeyboardFrameBeginUserInfoKey"]as!NSValueletkeyboardRect=value.cgRectValueletkeyboradHeight=keyboardRect.size.height}

@objcfunckeyBoardShow(noty:Notification){guardletuserInfo=noty.userInfoelse{return}letvalue=userInfo["UIKeyboardFrameEndUserInfoKey"]as!NSValueletkeyboardRect=value.cgRectValueletkeyboradHeight=keyboardRect.size.height}

参考:https://www.jianshu.com/p/06439695716b