Using frames while labels were set up by constrains

Question

I have some Labels in xib file, which were sett up by constrains. But I want to make some easy animations. Here is idea: set elements out of screen then user open aplication and then animate it back. So problem is: to make elements out of screen, I implemented following code in viewWillAppear method, but it doesnt work:

-(void)viewWillAppear:(BOOL)animated{
    CGFloat correction = self.view.bounds.size.width;
    CGPoint center1 = self.icon.center;
    center1.x += correction;
    self.icon.center = center1;
}

and my animation code in viewDidAppear method:

[UIView animateWithDuration:0.8
                       delay:0.1
      usingSpringWithDamping:1.0
       initialSpringVelocity:1.0
                     options:UIViewAnimationOptionCurveEaseInOut
                  animations:^{

                      CGFloat correction = self.view.bounds.size.width;
                      CGPoint center1 = self.icon.center;
                      center1.x -= correction;
                      self.icon.center = center1;

} completion:^(BOOL finished) {
                          NSLog(@"ready");
                      }];

but if I paste code from viewWillAppear to viewDidAppear it works. But a bit weird. How to make it right?

Do not set the frame of your views manually... frames are calculated by the autolayout engine and any interference outside that will brake your layout. So you are left with 2 options: 1. Animate the constraints instead (if your animation will affect other views), 2. Animate a transform (a translation in your case) in order to animate _only_ the [presentation layer](https://www.objc.io/issues/12-animations/animations-explained/) — Alladinian, Apr 24 '17 at 11:24

Using frames while labels were set up by constrains

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