Make move animation permanent in iOS

Question

I am trying to make a simple application where there are 3 buttons. When user clicks any of the button, they are animated(moved) to their new positions! All this works from this code:

[UIView animateWithDuration:1.2
                  delay:0.1
                options: UIViewAnimationCurveEaseOut
             animations:^
 {
 //Moving the Sum (UIButton which will move through this animation)
 CGRect frame =  Sum.frame;
 frame.origin.y = -20;
 frame.origin.x = (-120);
 Sum.frame = frame;
 .....
....
 }
             completion:^(BOOL finished)
  {
 NSLog(@"Completed");
//adding subview after the animation is complete! newView is an example!
[self.view addSubview:newView];}];

The Problem is that once i add a subview to the main view, All buttons come back to their old position! meaning they weren't moved permanently.. how can i solve this? Plz help guys!

Answer 1

What happens when you add a view? A layout is performed. You could have done two mistakes

1. You are using autolayout.

   If you are using autolayout, changing frames directly is not advised and a relayout will update the views to their original position using current constraints.

2. You are setting the frame position in layoutSubviews , viewWillLayout or viewDidLayout .

   Check where you are setting the original position. Can the method be called multiple times?

Answer 2

您已经保存了新框架的X，Y位置，然后通过编码设置了该框架。