键盘弹出和回收通知

[[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(jianpantanchu:) name:UIKeyboardWillShowNotificationobject:nil];

    [[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(jianpanhuishou:) name:UIKeyboardWillHideNotificationobject:nil];

//键盘弹出

- (void)jianpantanchu:(NSNotification*)notification

{

    NSDictionary*info = notification.userInfo;

    NSValue*value = [info objectForKey:UIKeyboardFrameEndUserInfoKey];

    CGSizesize = [value CGRectValue].size;

    _backview.frame= CGRectMake(0, SCREEN_HEIGHT- STA_NAV_HEIGHT- 35*displayScale- size.height, SCREEN_WIDTH, 35*displayScale);

    

}

//键盘回收

- (void)jianpanhuishou:(NSNotification*)notification

{

    _backview.frame= CGRectMake(0, SCREEN_HEIGHT- STA_NAV_HEIGHT- 35*displayScale, SCREEN_WIDTH, 35*displayScale);

}