当 UIView 框架更改时，视图内的 AVPlayer 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，它包含一个 AVPlayer 来显示视频.改变方向时，我需要改变视频的大小和位置.

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.

我对调整图层大小的经验不是很丰富，所以我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，我更改了 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)];

此时，我需要将 avPlayer 调整为相同的尺寸.这不会自动发生 - avPlayer 在 vi​​deoHolderView 中保持它的小尺寸.

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，我非常感谢您的建议.

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

谢谢各位.

推荐答案

将@Suran 的解决方案转换为 Swift:

Converting @Suran's solution to Swift:

首先，创建一个继承 UIView 的类，您只覆盖 1 个变量:

First, create a class inheriting UIView where you override only 1 variable:

import UIKit
import AVFoundation

class AVPlayerView: UIView {
    override class var layerClass: AnyClass {
        return AVPlayerLayer.self
    }
}

然后使用界面构建器添加一个简单的 UIView 并将其类更改为您刚刚创建的类:AVPlayerView

Then add a simple UIView using the interface builder and change its class to the one you just created: AVPlayerView

然后，为该视图创建一个出口.称之为avPlayerView

Then, make an outlet for that view. Call it avPlayerView

@IBOutlet weak var avPlayerView: AVPlayerView!

现在，您可以在视图控制器中使用该视图并像这样访问其 avlayer:

Now, you can use that view inside your viewcontroller and access its avlayer like this:

let avPlayer = AVPlayer(url: video)
let castLayer = avPlayerView.layer as! AVPlayerLayer
castLayer.player = avPlayer
avPlayer.play()

该层现在将像常规层一样遵循约束.无需手动更改边界或大小.

The layer will now follow the constraints just like a regular layer would do. No need to manually change bounds or sizes.

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