static CKComponentAnimationHooks hooksForFinalUnmountAnimation()

in ComponentKit/Core/CKComponentAnimation.mm [51:80]

• 30 lines of code
• 1 McCabe index (conditional complexity)

static CKComponentAnimationHooks hooksForFinalUnmountAnimation(const CKComponentFinalUnmountAnimation &a,
                                                               UIView *const hostView) noexcept
{
  const auto component = a.component;
  CAAnimation *const animation = [a.animation copy];
  animation.fillMode = kCAFillModeForwards;
  animation.removedOnCompletion = NO;
  return CKComponentAnimationHooks {
    .willRemount = ^() {
      const auto viewForAnimation = [component viewForAnimation];
      RCCAssertWithCategory(viewForAnimation != nil, [component className],
                            @"Can't animate component without a view. Check if %@ has a view.", [component className]);
      const auto snapshotView = [viewForAnimation snapshotViewAfterScreenUpdates:NO];
      snapshotView.layer.anchorPoint = viewForAnimation.layer.anchorPoint;
      snapshotView.frame = [viewForAnimation convertRect:viewForAnimation.bounds toView:hostView];
      snapshotView.userInteractionEnabled = NO;
      return snapshotView;
    },
    .didRemount = ^(UIView *const snapshotView){
      [hostView addSubview:snapshotView];
      auto const animationAddTime = [snapshotView.layer convertTime:CACurrentMediaTime() fromLayer:nil];
      animation.beginTime += animationAddTime;
      [snapshotView.layer addAnimation:animation forKey:nil];
      return snapshotView;
    },
    .cleanup = ^(UIView *const snapshotView){
      [snapshotView removeFromSuperview];
    }
  }.byAddingCompletion(a.completion);
}