- 1 UIImageView+YYWebImage.m
CATransition *transition = [CATransition animation];
transition.duration = stage == YYWebImageStageFinished ? _YYWebImageFadeTime : _YYWebImageProgressiveFadeTime;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;
[self.layer addAnimation:transition forKey:_YYWebImageFadeAnimationKey];
CATransition *transition = [CATransition animation];
transition.duration = stage == YYWebImageStageFinished ? _YYWebImageFadeTime : _YYWebImageProgressiveFadeTime;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;
[self addAnimation:transition forKey:_YYWebImageFadeAnimationKey];
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