如何更改AVPlayer的视频方向？

Question

我想使用AVPlayer旋转视频的重放.有没有办法顺时针旋转90度？
这是一些代码:

self.player = AVPlayer(URL: NSURL(fileURLWithPath: dataPath))
playerLayer = AVPlayerLayer.init(player: self.player)
playerLayer.frame = view.bounds

playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
view.layer.addSublayer(playerLayer)
player.play()

UPDATE

这个工作:

self.player = AVPlayer(URL: NSURL(fileURLWithPath: dataPath))
playerLayer = AVPlayerLayer.init(player: self.player)                                     
playerLayer.setAffineTransform(CGAffineTransformMakeRotation(CGFloat(M_PI))
playerLayer.frame = view.bounds        
playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
view.layer.addSublayer(playerLayer)
player.play()

Answer 1

如果您使用的是 Objective-C，下面的代码会有所帮助。

示例代码：

#define degreeToRadian(x) (M_PI * x / 180.0)
#define radianToDegree(x) (180.0 * x / M_PI)

- (void)rotateVideoPlayerWithDegree:(CGFloat)degree {
    [_playerLayer setAffineTransform:CGAffineTransformMakeRotation(degreeToRadian(degree))];
}

Answer 2

Hooni 在 Swift 3 中的回答：

let affineTransform = CGAffineTransform(rotationAngle: degreeToRadian(90))
avPlayerLayer.setAffineTransform(affineTransform)

func degreeToRadian(_ x: CGFloat) -> CGFloat {
    return .pi * x / 180.0
}