如何在Swift中循环AVPlayer？

一个简单的问题，由于某种原因，我似乎找不到答案。

如何在Swift中循环AVPlayer？

numberOfLoops = -1仅适用于AVAudioPlayer

我确实需要它无任何延迟地循环/黑色闪光等。这就是为什么我不使用MPMoviePlayerViewController的原因。

谢谢你的帮助。

码：

    let url_1 = NSURL.fileURLWithPath(outputFilePath_1)

    let asset_1 = AVAsset.assetWithURL(url_1) as? AVAsset
    let playerItem_1 = AVPlayerItem(asset: asset_1)

    let player_1 = AVPlayer(playerItem: self.playerItem_1)

    let playerLayer_1 = AVPlayerLayer(player: self.player_1)

    playerLayer_1!.frame = self.view.frame

    self.view.layer.addSublayer(self.playerLayer_1)

    player_1!.play()

Swift 5（iOS 10.0以上）

var playerLooper: AVPlayerLooper! // should be defined in class
var queuePlayer: AVQueuePlayer!
...

let asset: AVAsset = ... // AVAsset with its 'duration' property value loaded
let playerItem = AVPlayerItem(asset: asset)
self.queuePlayer = AVQueuePlayer(playerItem: playerItem)

// Create a new player looper with the queue player and template item
self.playerLooper = AVPlayerLooper(player: queuePlayer, templateItem: playerItem)

<iOS 10.0

以上所有功能均可在任何iOS版本中使用。但是，对于<iOS 10.0，这是唯一的解决方案。

斯威夫特4

var player: AVPlayer!

...

NotificationCenter.default.addObserver(forName: .AVPlayerItemDidPlayToEndTime, object: self.player.currentItem, queue: .main) { [weak self] _ in
    self?.player?.seek(to: CMTime.zero)
    self?.player?.play()
}

迅捷3

NotificationCenter.default.addObserver(forName: .AVPlayerItemDidPlayToEndTime, object: self.player.currentItem, queue: .main) { [weak self] _ in
    self?.player?.seek(to: kCMTimeZero)
    self?.player?.play()
}

迅捷2

配置AVPlayerItem并创建播放器后：

var player: AVPlayer!

...

// Invoke after player is created and AVPlayerItem is specified
NSNotificationCenter.defaultCenter().addObserver(self,
    selector: "playerItemDidReachEnd:",
    name: AVPlayerItemDidPlayToEndTimeNotification,
    object: self.player.currentItem)

...
 
func playerItemDidReachEnd(notification: NSNotification) {
    self.player.seekToTime(kCMTimeZero)
    self.player.play()
}

别忘了 import AVFoundation

从iOS 10开始，无需使用通知即可循环播放视频，只需使用AVPlayerLooper即可，如下所示：

let asset = AVAsset(url: videoURL)
let item = AVPlayerItem(asset: asset)
let player = AVQueuePlayer(playerItem: item)
videoLooper = AVPlayerLooper(player: player, templateItem: item)

确保此循环程序是在函数作用域之外创建的，以防它在函数返回时停止。

@Christopher Pickslay为Swift 4更新了答案：

func loopVideo(videoPlayer: AVPlayer) {
    NotificationCenter.default.addObserver(forName: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: nil, queue: nil) { notification in
        videoPlayer.seek(to: CMTime.zero)
        videoPlayer.play()
    }
}

但是，正如我在他的回答下面提到的那样，如果您有多个播放器，请确保将对象指定为AVPlayer的播放器项。

或者，您可以使用基于块的NSNotificationCenter API：

func loopVideo(videoPlayer: AVPlayer) {
    NSNotificationCenter.defaultCenter().addObserverForName(AVPlayerItemDidPlayToEndTimeNotification, object: nil, queue: nil) { notification in
        videoPlayer.seekToTime(kCMTimeZero)
        videoPlayer.play()
    }
}

好，我已经解决了。感谢Msencenb用我的Objective C答案指出正确的方向。

player_1?.actionAtItemEnd = .None

//set a listener for when the video ends   
NSNotificationCenter.defaultCenter().addObserver(self,
        selector: "restartVideoFromBeginning",
        name: AVPlayerItemDidPlayToEndTimeNotification,
        object: player_1?.currentItem)


//function to restart the video
func restartVideoFromBeginning()  {

    //create a CMTime for zero seconds so we can go back to the beginning
    let seconds : Int64 = 0
    let preferredTimeScale : Int32 = 1
    let seekTime : CMTime = CMTimeMake(seconds, preferredTimeScale)

    player_1!.seekToTime(seekTime)

    player_1!.play()

}

我已经设法在swift 3中为OSX创建了无缝的视频循环。它应该可以在iOS上运行，并且在swift 2上也不需要进行任何修改。

var player : AVQueuePlayer!

// Looping video initial call
internal func selectVideoWithLoop(url : URL)
{
    let asset = AVAsset(url: url)
    player.pause()
    let playerItem1 = AVPlayerItem(asset: asset)
    let playerItem2 = AVPlayerItem(asset: asset)
    player.removeAllItems()
    player.replaceCurrentItem(with: playerItem1)
    player.insert(playerItem2, after: playerItem1)
    player.actionAtItemEnd = AVPlayerActionAtItemEnd.advance
    player.play()

    let selector = #selector(ViewController.playerItemDidReachEnd(notification:))
    let name = NSNotification.Name.AVPlayerItemDidPlayToEndTime
    // removing old observer and adding it again for sequential calls. 
    // Might not be necessary, but I like to unregister old notifications.
    NotificationCenter.default.removeObserver(self, name: name, object: nil)
    NotificationCenter.default.addObserver(self, selector: selector, name: name, object: nil)
}

// Loop video with threadmill pattern
// Called by NotificationCenter, don't call directly
func playerItemDidReachEnd(notification: Notification)
{
    let item = player.currentItem!
    player.remove(item)
    item.seek(to: kCMTimeZero)
    player.insert(item, after: nil)
}

当您要更改视频时，只需再次使用不同的URL调用selectVideoWithLoop。

Swift 3.0：

首先检查视频终点：

NotificationCenter.default.addObserver(self, selector: #selector(LoginViewController.playerItemDidReachEnd), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: self.player?.currentItem)



func videoDidReachEnd() {

        //now use seek to make current playback time to the specified time in this case (O)
        let duration : Int64 = 0 (can be Int32 also)
        let preferredTimeScale : Int32 = 1
        let seekTime : CMTime = CMTimeMake(duration, preferredTimeScale)
        player!.seek(to: seekTime)
        player!.play()
    }

对话可能会晚一点，但是为了让我感到高兴（如果有人再来这里），我在这里找到了这个答案（这是SO的另一个答案），这对我很有用。