objective c - IOS: Weird color in UIView transition : UIViewAnimationOptionTransitionCurlDown -

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i'm @ loss here, trying use uiviewanimationoptiontransitioncurldown on view has transparency, , here result (visually), code below. want transition happen without weird shadow. insight why shadow displaying helpful. happens during animation.

first image

second image

third image

    [uiview transitionwithview:sender                    duration:15.0f                     options:uiviewanimationoptiontransitioncurldown                 animations:^{                     [self modifycontentofpagewith:sender];                 }                  completion:nil];

i tried same piece of code. downloaded yellow sticky image web , realized actual size of image bigger active image. shade of whole image during animation. cut (invisible) borders of image fit yellow part , , magically, worked perfect.


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