错误域=NSCocoa错误域代码=257 无法打开 fil " " - Firebase

Question

，所以我正在访问用户的视频＆amp;通过自定义UICollectionView的照片，我的问题是，当我尝试通过手机上传到视频时，我会遇到此错误：

2017-09-03 13:09:20.884509-0400 Project[5797:2021536] Cannot get file size: Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_3476.MP4” couldn’t be opened because you don’t have permission to view it." UserInfo={NSURL=file:///var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSFilePath=/var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSUnderlyingError=0x17064f450 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}
  /var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4
2017-09-03 13:09:21.261767-0400 Project[5797:2021536] Body file is unreachable: /var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4
  Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_3476.MP4” couldn’t be opened because you don’t have permission to view it." UserInfo={NSURL=file:///var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSFilePath=/var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSUnderlyingError=0x170651b20 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}

这是我加载文件的地方

struct Media {
    var image:UIImage?
    var videoURL:NSURL?
}
var mediaArray = [Media]()
func grabPhotos(){
    let imgManager = PHImageManager.default()
    let requestOptions = PHImageRequestOptions()
    requestOptions.isSynchronous = true
    requestOptions.deliveryMode = .highQualityFormat
    let fetchOptions = PHFetchOptions()
    fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
    if let fetchResult : PHFetchResult = PHAsset.fetchAssets(with: .video, options: fetchOptions) {

        if fetchResult.count > 0 {
            for i in 0..<fetchResult.count{
                var mediaItem = Media()
                //Used for fetch Image//
                imgManager.requestImage(for: fetchResult.object(at: i) as PHAsset , targetSize: CGSize(width: 400, height: 400), contentMode: .aspectFit, options: requestOptions, resultHandler: {
                    image, error in
                    let imageOfVideo = image! as UIImage
                    mediaItem.image = imageOfVideo;
                    //Used for fetch Video//
                    imgManager.requestAVAsset(forVideo: fetchResult.object(at: i) as PHAsset, options: PHVideoRequestOptions(), resultHandler: {(avAsset, audioMix, info) -> Void in
                        if let asset = avAsset as? AVURLAsset {
                            let videoData = NSURL(string: "(asset.url)")
                            let duration : CMTime = asset.duration
                            let durationInSecond = CMTimeGetSeconds(duration)
                            print(durationInSecond)
                            mediaItem.videoURL = videoData!
                            self.mediaArray.append(mediaItem)
                            print(self.mediaArray.count)

                        }
                    })
                })
            }
        }
        else{
            //showAllertToImportImage()//A function to show alert
        }
    }
}

我认为在上传视频时与之无关，因为我可以从手机上录制视频，只是从手机本身上传。我只是在URL上转移到NextVC，例如：

let videoVC = PrepareVideoVC()
        videoVC.url = outputFileURL as URL!
        self.navigationController?.pushViewController(videoVC, animated: false)

我研究了该文件"无法打开，因为您没有权限查看它，但无法真正弄清楚如何实施

我也遇到了https://stackoverflow.com/a/41517165/7823620，但我再次尝试实施它，但无法获得它以免给我错误

也可以从模拟器上传，但不能从手机上传

它正在尝试从此目录获取文件：

NSFilePath=/var/mobile/Media/DCIM/

Answer 1

您可以尝试

url.startAccessingSecurityScopedResource()
<...>
url.stopAccessingSecurityScopedResource()

Answer 2

使用此选项：

PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHVideoRequestOptionsVersionCurrent;
options.deliveryMode = PHVideoRequestOptionsDeliveryModeHighQualityFormat;
options.networkAccessAllowed = true;

如果您请求中间质量的视频，那么您将出现错误。错误域= nscocoaerrordomain代码= 257，无许可...

Answer 3

，因此，如果AppDelegate通过此方法传递在启动文档中：

 func application(_: UIApplication, open url: URL, options _: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {

我发现我必须这样做才能修复它，以便使用上述Ivan的解决方案成功加载了FileManager文档，但是如果说该文档是电子邮件附件，则无法进行调用。

这为我修复了，再次感谢伊万·瓦维洛夫（Ivan Vavilov）的帖子。

func application(_: UIApplication, open url: URL, options _: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {
    print("Doc attachment passed")
    let docAttachment = url
    
    // files written to 'tmp' are NOT backed up to iCloud or iTunes
    let tempDir = getTempDirectory()
    
    // add file name to tmp path
    tempFileToLoad = tempDir.appendingPathComponent(docAttachment.lastPathComponent)
    let fm = FileManager()
    
    // passed a file from the FileManger app?
    let isAttachmentScopedResource = docAttachment.startAccessingSecurityScopedResource()
    
    do {
        
        // put in tmp so we can read/write
        try fm.copyItem(at: docAttachment, to: tempFileToLoad!)
        
        if(isAttachmentScopedResource) {
            // have MUST release the security access after calling it
            docAttachment.stopAccessingSecurityScopedResource()
        }
        
    } catch {
        print("Error getting file.  (error)")
        return false
    }