title: iOS 13 Animating View Not Changing Frame
body: <p>I have an app which is compiled in Xcode 10 on iOS 13 simulator. In one view there is a "tray" view which shows from the bottom when tapped, in iOS 12 it works perfectly, in iOS 13, the tap is calling the method, but the changes to the frame are not saving - I have included outputs from the debugger in comments so you can see what the outputs of the frame values are;</p>
  
  <pre><code>- (void) userClickActivityTray: (UITapGestureRecognizer *) gestureRecognizer {
  if(self.activityTrayShown) {
      /*
       (lldb) po self.activityTrayContainerView.frame
       (origin = (x = 0, y = 792), size = (width = 414, height = 104))
       */
      [self hideActivityTray];
  } else {
      if (!self.activityTrayViewInitialFrameComputed) {
          self.activityTrayViewInitialFrameComputed = YES;
          self.activityTrayInitialFrame = self.activityTrayContainerView.frame;
      }
  
      /*
       (lldb) po self.activityTrayContainerView.frame
       (origin = (x = 0, y = 638), size = (width = 414, height = 224))
       (origin = (x = 0, y = 638), size = (width = 414, height = 224))
  
       (lldb) po self.activityTrayInitialFrame
       (origin = (x = 0, y = 792), size = (width = 414, height = 104))
       (origin = (x = 0, y = 792), size = (width = 414, height = 104))
  
       (lldb)
       */
  
      [UIView animateWithDuration:0.25 animations:^{
          self.activityTrayContainerView.frame = CGRectMake(self.view.bounds.origin.x,
                                                            self.bottomView.frame.origin.y - self.activityTrayViewController.maximumHeight,
                                                            self.view.bounds.size.width,
                                                            self.activityTrayViewController.maximumHeight);
  
          self.activityTrayBackgroundView.alpha = 1.0;
          self.bottomView.alpha = self.dotsProgressView.alpha = 0;
      } completion:^(BOOL finished) {
          self.activityTrayShown = YES;
          /*
           (lldb) po self.activityTrayContainerView.frame
           (origin = (x = 0, y = 557), size = (width = 414, height = 305))
           (origin = (x = 0, y = 792), size = (width = 414, height = 104))
           */
      }];
  }
  </code></pre>
  
  <p>}</p>