如何在 iOS 中播放视频 PHAsset？

Question

我想播放来自PHAsset 的视频，这些视频是从 iOS 照片中收集的。 PHAsset 视频 nsurl (https://stackoverflow.com/a/35099857/1084174) 对我自己的应用程序有效，比如说 MyPlayer 片刻/块。当我将图像/视频复制到 MyPlayers 自己的沙箱中时，nsurl 才会始终有效。在我看来，

我需要将每个视频从临时 PHAsset nsurl 复制到 MyPlayers 沙盒（应用程序组/文档），然后我才能播放视频 沙盒相对 nsurl。

如果是这种情况，所有其他播放器如何即时播放长视频？如果有其他方法可以在不复制到应用沙箱的情况下播放视频，请告诉我方法。

Answer 1

在 Swift 5 中

func playVideo(view:UIViewController, asset:PHAsset) {

        guard (asset.mediaType == PHAssetMediaType.video)

            else {
                print("Not a valid video media type")
                return
        }

        PHCachingImageManager().requestAVAsset(forVideo: asset, options: nil) { (assets, audioMix, info) in
            let asset = assets as! AVURLAsset
            DispatchQueue.main.async {

                let player = AVPlayer(url: asset.url)
                let playerViewController = AVPlayerViewController()
                playerViewController.player = player
                view.present(playerViewController, animated: true) {
                    playerViewController.player!.play()
                }
            }
        }
    }

Answer 2

以下解决方案也适用于慢动作视频。

func playVideo(asset: PHAsset) {
    guard asset.mediaType == .video else {
        // Handle if the asset is not a video.
        return
    }

    let options = PHVideoRequestOptions()
    options.isNetworkAccessAllowed = true

    PHCachingImageManager().requestPlayerItem(forVideo: asset, options: options) { (playerItem, info) in
        DispatchQueue.main.async {
            let playerViewController = AVPlayerViewController()
            playerViewController.player = AVPlayer(playerItem: playerItem)
            present(playerViewController, animated: true) {
                playerViewController.player?.play()
            }
        }
    }
}

Answer 3

@Sazzad Hissain Khan 在 Swift 3 中的解决方案：

来自 PHAsset：

func playVideo (view: UIViewController, videoAsset: PHAsset) {

    guard (videoAsset.mediaType == .video) else {
        print("Not a valid video media type")
        return
    }

    PHCachingImageManager().requestAVAsset(forVideo: videoAsset, options: nil) { (asset, audioMix, args) in
        let asset = asset as! AVURLAsset

        DispatchQueue.main.async {
            let player = AVPlayer(url: asset.url)
            let playerViewController = AVPlayerViewController()
            playerViewController.player = player
            view.present(playerViewController, animated: true) {
                playerViewController.player!.play()
            }
        }
    }
}

来自 AppLocalUrl：

func playVideo (view: UIViewController, appLocalUrl: URL) {

    DispatchQueue.main.async {

        let player = AVPlayer(url: appLocalUrl)
        let playerViewController = AVPlayerViewController()
        playerViewController.player = player
        view.present(playerViewController, animated: true) {
            playerViewController.player!.play()
        }
    }
}

Answer 4

经过几天的实验，我终于找到了一个解决方案，

导入文件

import AVKit

来自 PHAsset

static func playVideo (view:UIViewController, asset:PHAsset) {

        guard (asset.mediaType == PHAssetMediaType.Video)

            else {
                print("Not a valid video media type")
                return
        }

        PHCachingImageManager().requestAVAssetForVideo(asset, options: nil, resultHandler: {(asset: AVAsset?, audioMix: AVAudioMix?, info: [NSObject : AnyObject]?) in

            let asset = asset as! AVURLAsset

            dispatch_async(dispatch_get_main_queue(), {

                let player = AVPlayer(URL: asset.URL)
                let playerViewController = AVPlayerViewController()
                playerViewController.player = player
                view.presentViewController(playerViewController, animated: true) {
                    playerViewController.player!.play()
                }
            })
        })
    }

来自 AppLocalUrl

static func playVideo (view:UIViewController, appLocalUrl:NSURL) {

        dispatch_async(dispatch_get_main_queue(), {

            let player = AVPlayer(URL: appLocalUrl)
            let playerViewController = AVPlayerViewController()
            playerViewController.player = player
            view.presentViewController(playerViewController, animated: true) {
                playerViewController.player!.play()
            }
        })
    }