iOS弹键盘、收键盘

 //监听键盘
    [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyBoardShow:)name:UIKeyboardWillShowNotificationobject:nil];
    [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyBoardHide:)name:UIKeyboardWillHideNotificationobject:nil];

#pragma mark弹出键盘
-(void)keyBoardShow:(NSNotification*)notification
{

   //notification.userInfo获得用户的所有信息，userInfo是一个字典，根据key值     为UIKeyboardFrameEndUserInfoKey拿到键盘的frame的“字符串”，将这个字符串转成Rect
    int y = [[notification.userInfoobjectForKey:UIKeyboardFrameBeginUserInfoKey]CGRectValue].size.height;
   
    [UIViewanimateWithDuration:0.3animations:^{
        bgImageView.center= CGPointMake(bgImageView.center.x,bgImageView.center.y-y/2);
    }];
   
    //将logo设置没
    logoImageView.transform= CGAffineTransformMakeScale(0, 0);

}
#pragma mark收键盘
-(void)keyBoardHide:(NSNotification*)notification
{
    [UIViewanimateWithDuration:0.3animations:^{
        bgImageView.center= self.view.center;
        logoImageView.transform= CGAffineTransformMakeScale(1, 1);
    }];
}