UIView框架更改时，视图内的AVPlayer图层不会调整大小 [英] AVPlayer layer inside a view does not resize when UIView frame changes

问题描述

我有一个UIView，其中包含一个AVPlayer来显示视频.更改方向时，我需要更改视频的大小和位置.

I have a UIView which contains an AVPlayer to show a video. When changing orientation, I need to change the size and location of the video.

我对调整图层的大小不是很有经验，因此在调整视频大小时遇到​​了问题.

I'm not very experienced with resizing layers, so I'm having problems making the video resize.

我首先创建AVPlayer并将其播放器添加到我的videoHolderView层:

I start by creating the AVPlayer and adding its player to my videoHolderView's layer:

NSURL *videoURL = [NSURL fileURLWithPath:videoPath];
self.avPlayer = [AVPlayer playerWithURL:videoURL];

AVPlayerLayer* playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];
playerLayer.frame = videoHolderView.bounds;
playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
playerLayer.needsDisplayOnBoundsChange = YES;

[videoHolderView.layer addSublayer:playerLayer];
videoHolderView.layer.needsDisplayOnBoundsChange = YES;

然后，稍后，我更改videoHolderView框架的大小和位置:

Then, at a later point, I change the size and location of the videoHolderView's frame:

[videoHolderView setFrame:CGRectMake(0, 0, 768, 502)];

这时，我需要avPlayer调整为这些相同的尺寸.这不会自动发生-avPlayer在videoHolderView中保持很小的尺寸.

At this point, I need the avPlayer to resize to these same dimension. This doesn't happen automatically - the avPlayer stays at it's small size within the videoHolderView.

如果有人可以提供帮助，我将非常感谢您提供任何建议.

If anyone can help, I'd really appreciate any advice.

谢谢大家.

推荐答案

最后，我通过将AVPlayerLayer重新添加到UIView来解决了这个问题.我不确定为什么更改框架会删除图层，但是确实如此.这是最终的解决方案:

In the end I solved this by re-adding the AVPlayerLayer to the UIView. I'm not sure why changing the frame removed the layer, but it did. Here's the final solution:

//amend the frame of the view
[videoHolderView setFrame:CGRectMake(0, 0, 768, 502)];

//reset the layer's frame, and re-add it to the view
AVPlayerLayer* playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];
playerLayer.frame = videoHolderView.bounds;
[videoHolderView.layer addSublayer:playerLayer];

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