移动子视图时移动超级视图-ObjectiveC

Question

I have a super UIView which has a sub UIView . The sub UIView has the UIPanGestureRecognizer .

I need to move the super UIView when the user tries to move the subUIView .

I do not want to set the center as that would give a jerk.

I need to move the super UIView smoothly when the user tries to move the sub UIView .Because the super UIView is moving, the user will get the feeling that he is moving the sub UIView .

So, I how do I get this done?

Answer 1

You can set the center to avoid jerk use UIView animation block

[UIView animateWithDuration:0.5
                         animations:^{
                            //set center here
                         }
                         completion:^(BOOL finished) {

                         }];

Answer 2

assuming you set the frame of the subUIView when the gesture recognizer triggers, just move the super view the same amount

subview.frame = CGRectMake(-x,-y,w,h); //move opposite way to superview
[subview superview].frame = CGRectMake(x,y,w,h); //move

edit: misinterpreted what you were trying to accomplish a bit, you would need to move the subview the opposite way to which the superview is moving for the subview to stay in place while the superview moves