拍摄隐藏的UIView的快照 [英] Take a snapshot of a hidden UIView

问题描述

我正在尝试对隐藏视图进行快照，但是遇到了一些问题。如果我尝试快速取消隐藏，拍摄快照然后重新隐藏，有时会在屏幕上出现快速闪烁的感觉，这很刺耳。

I'm trying to take a snapshot of a hidden view but am running into several issues. If I try unhiding it quickly, taking a snapshot, and then rehiding it, I sometimes get a quick flicker on the screen that is pretty jarring.

toCollectionViewCell.hidden = NO;
UIView *toPlaceHolderSnapshot = [toCollectionViewCell resizableSnapshotViewFromRect:toCollectionViewCell.bounds afterScreenUpdates:YES withCapInsets:UIEdgeInsetsZero];
toCollectionViewCell.hidden = YES;

我很确定闪烁是由afterScreenUpdates：YES引起的，但我无法想象

I'm pretty sure the flicker is caused by the afterScreenUpdates:YES, but I can't imagine that is intended behavior.

我也尝试过将单元格/视图移出屏幕而不是隐藏它，但是我不确定何时可以重新加载该单元格并因此过早地移回原处。

I've also tried moving the cell/view off screen instead of hiding it, but I can't be certain when that cell might be reloaded and therefore moved back into its place prematurely.

有没有办法对隐藏视图进行快照或更巧妙的方法来实现此目的？在自定义过渡动画期间，我需要此功能，在该动画中，我将集合视图单元格从集合视图中拉出，然后在关闭时将其返回到位。我正在制作之前/之后状态的快照，然后在动画过程中在两者之间切换。

Is there a way to take a snapshot of a hidden view or a more clever way to achieve this? I need this functionality during a custom transition animation where I am pulling a collection view cell out of the collection view and then returning it back into place on dismiss. I am taking snapshots of the before/after state and then transitioning between the two during the animation.

谢谢！

推荐答案

向视图层次结构中添加一个额外的容器视图。隐藏该容器将具有相同的视觉效果，但是您将可以轻松地快照该容器的内容。

Add an extra container view to your view hierarchy. Hiding the container will have the same visual effect, but you'll be able to snapshot the content of a container with ease.

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