UIVisualEffectView transition about hero HOT 11 CLOSED

If you set the UIVisualEffectView as your's UIViewController.view in loadView(), then the transition is automatically handled by UIKit. Maybe it'll solve your issue.

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I haven't looked at the exact code that peforms the animations, but is it possible to check for the views that are animated (traversing the view hierarchy)? Then every VisualEffectView's effect would be set to nil and reset in an animation block. That way it could be animated

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With the new .overFullScreen support. This should be possible. We just have to figure out how to animation UIVisualEffectView, since it doesn't support opacity animation.

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As I said UIVisualEffectView can animate its blur by setting the effect from nil to a blur effect in an animation block so you might have to make a special case if a view is a UIVisualEffectView and the opacity is to be animated

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Yes, but that doesn't allow interactive scrubbing or reversing the animation.

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For that you have to set the blur with a UIViewPropertyAnimator and then scrub by setting it's progress

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But that's iOS 10+

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I tried implementing the UIViewPropertyAnimator. I modify to menu example to have a blur background.

http://lkzhao.com/video/?path=%5Cpublic%5Cposts%5Chero%5Cmenu.mov

It doesn't works when it is interactive though. Whenever, I set the .fractionComplete, the blur effect immediately jumps to the end.

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Maybe if it's interactive you have to take a snapshot of the view and animate its alpha similar to the way I tried to do it?

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@lkzhao Actually the way you tried should work, check out this example project: https://github.com/fichek/AnimateBlurRadius/

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I think the problem is here: https://github.com/lkzhao/Hero/blob/master/Sources/HeroViewPropertyViewContext.swift#L59
Since it already starts the animation immediately, if it is interactive it shouldn't do that and only rely on the fractionComplete.

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