获取PHAsset的URL

Question

我使用自定义图像选择器来选择时间流逝，我想获取所选时间流逝的网址，以便我可以播放时间流逝。

- (void)qb_imagePickerController:(QBImagePickerController *)imagePickerController didFinishPickingAssets:(NSArray *)assets {
for (PHAsset *asset in assets) {



    NSURL *url = [NSURL URLWithString: assetURLgoesHere];
    AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil];
    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:avAsset];
    AVPlayer *videoPlayer = [AVPlayer playerWithPlayerItem:playerItem];


    [videoPlayer play];

}

[self dismissViewControllerAnimated:YES completion:NULL];
}

这就是我现在所拥有的，但我需要获得资产的网址。

我通常使用swift但这个自定义图像选择器是用objective-c编写的。所以我有点客观 - c菜鸟

更新的代码

- (void)qb_imagePickerController:(QBImagePickerController *)imagePickerController didFinishPickingAssets:(NSArray *)assets {
for (PHAsset *asset in assets) {

    - (PHImageRequestID)requestAVAssetForVideo:(PHAsset *)asset options:(PHVideoRequestOptions *)options resultHandler:(void (^)(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info))resultHandler

    NSURL *url = [NSURL URLWithString: asset];
    AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil];
    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:avAsset];
    AVPlayer *videoPlayer = [AVPlayer playerWithPlayerItem:playerItem];


    [videoPlayer play];

}

[self dismissViewControllerAnimated:YES completion:NULL];
}

Answer 1

你应该使用PHImageManager。

使用类的sharedInstance并使用PHAsset，options和完成块处理程序调用此方法：

- (PHImageRequestID)requestAVAssetForVideo:(PHAsset *)asset options:(PHVideoRequestOptions *)options resultHandler:(void (^)(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info))resultHandler

处理程序将为您提供AVAsset，您应该使用AVPlayerItem而不是URL。

例：

[[PHImageManager defaultManager] requestAVAssetForVideo:asset options:nil resultHandler:^(AVAsset *avAsset, AVAudioMix *audioMix, NSDictionary *info) {
  // Use the AVAsset avAsset
  AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:avAsset];
  AVPlayer *videoPlayer = [AVPlayer playerWithPlayerItem:playerItem];
}];

注意它可能的异步会进一步干扰你的应用程序流。

Answer 2

顺便说一句，如果你想要实际的URL - 也就是说，UIImagePickerController在创建AVPlayerItem时传递给AVPlayerItem的那个，以及看起来像用于AVAssetReader / Writer的URL的那个 - 那么做这个：

[[PHImageManager defaultManager] requestAVAssetForVideo:phAsset options:nil resultHandler:^(AVAsset *avAsset, AVAudioMix *audioMix, NSDictionary *info) {
    NSURL *url = (NSURL *)[[(AVURLAsset *)avAsset URL] fileReferenceURL];
    NSLog(@"url = %@", [url absoluteString]);
    NSLog(@"url = %@", [url relativePath]);
 }];

虽然phAsset是PHAsset对象，而avAsset是由PHImageManager生成的生成的AVAsset对象，但是从上面的代码输出到控制台将产生，例如：

2016-04-16 01:15:40.155 ChromaEpsilon[3423:933358] url = file:///.file/id=16777218.8262005
2016-04-16 01:15:40.155 ChromaEpsilon[3423:933358] url = /private/var/mobile/Media/DCIM/108APPLE/IMG_8421.MOV

Answer 3

对于Swift 3.0，您可以从PHAsset对象获取图像和视频的字符串URL

asset.requestContentEditingInput(with: PHContentEditingInputRequestOptions(), completionHandler: { (contentEditingInput, dictInfo) in

    if asset.mediaType == .image
    {
      if let strURL = contentEditingInput?.fullSizeImageURL?.absoluteString
      {
         print("IMAGE URL: ", strURL)
      }
    }
    else
    {
      if let strURL = (contentEditingInput!.avAsset as? AVURLAsset)?.url.absoluteString
      {
         print("VIDEO URL: ", strURL)
      }
    }
  })

Answer 4

在Swift 4.0和iOS 9.0+中正确回答@HirenPanchal

func getUrlFromPHAsset(asset: PHAsset, callBack: @escaping (_ url: URL?) -> Void)
{
    asset.requestContentEditingInput(with: PHContentEditingInputRequestOptions(), completionHandler: { (contentEditingInput, dictInfo) in

        if let strURL = (contentEditingInput!.audiovisualAsset as? AVURLAsset)?.url.absoluteString
        {
            PRINT("VIDEO URL: \(strURL)")
            callBack(URL.init(string: strURL))
        }
    })
}

Answer 5

在PHAsset的视频网址中，我曾经在Swift 2上准备了一个实用功能（播放来自PHAsset的视频）。分享这个答案，可能对某人有帮助。

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

请检查这个Answer

Answer 6

从QBImagePickerController中的didFinishPickingAssets获取Swift 4.2中PHAsset的视频URL

let imagePicker = QBImagePickerController()
imagePicker.delegate = self
imagePicker.numberOfColumnsInPortrait = 2
imagePicker.maximumNumberOfSelection = 2
imagePicker.allowsMultipleSelection = true
imagePicker.mediaType = .video

self.present(imagePicker, animated: true, completion: nil)

func qb_imagePickerController(_ imagePickerController: 
QBImagePickerController!, didFinishPickingAssets assets: [Any]!) {
    for asset in assets
    {
        PHCachingImageManager().requestAVAsset(forVideo: asset as! PHAsset, 
        options: nil, resultHandler: {(asset, audioMix, info) -> Void in
            if asset != nil {
                let avasset = asset as! AVURLAsset
                let urlVideo = avasset.url
                yourarray.add(urlVideo as URL)
            }

        })

    }


    imagePickerController.dismiss(animated: true) {
         //You can access video urls here
         print("Total Videos:\(yourarray.count)")
    }

 }