ios - Phasset + AfNetworking 上传多个视频

Question

目前我正在使用以下代码上传视频:

  NSURLRequest *urlRequest =  [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [UploadModel getAssetData:entity.asset resultHandler:^(NSData *filedata) {
          NSString *mimeType =[FileHelper mimeTypeForFileAtUrl:entity.fileUrl];
        //  NSError *fileappenderror;

        [formData appendPartWithFileData:filedata name:@"data" fileName: entity.filename mimeType:mimeType];

    }];

} error:&urlRequestError];

GetAssetData 方法

+(void)getAssetData: (PHAsset*)mPhasset resultHandler:(void(^)(NSData *imageData))dataResponse{ 

            PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
            options.version = PHVideoRequestOptionsVersionOriginal;

            [[PHImageManager defaultManager] requestAVAssetForVideo:mPhasset options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {

                if ([asset isKindOfClass:[AVURLAsset class]]) {
                    NSURL *localVideoUrl = [(AVURLAsset *)asset URL];
                    NSData *videoData= [NSData dataWithContentsOfURL:localVideoUrl];
                    dataResponse(videoData);

                }
            }];
    }

这种方法的问题是，只要上传大型/多个视频文件，应用程序就会耗尽内存。我想这是由于请求 NSDATA(又名 filedata )上传文件(见上面的方法)。我尝试使用方法请求文件路径appendPartWithFileURL 代替 appendPartWithFileData它适用于模拟器。并在真实设备上失败，并出现无法通过指定路径读取文件的错误。我在这里描述了这个问题 PHAsset + AFNetworking. Unable to upload files to the server on a real device

=======================================

更新:我修改了我的代码以测试在新的 iPhone 6s+ 上通过本地路径上传文件的方法，如下所示

 NSURLRequest *urlRequest =  [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

        NSString *mimeType =[FileHelper mimeTypeForFileAtUrl:entity.fileUrl];
        NSError *fileappenderror;

        [formData appendPartWithFileURL:entity.fileUrl name:@"data" fileName:entity.filename mimeType:mimeType error:&fileappenderror];

        if (fileappenderror) {
            [Sys MyLog:  [NSString stringWithFormat:@"Failed to  append: %@", [fileappenderror localizedDescription] ] ];
        }

    } error:&urlRequestError];

在 iPhone 6s+ 上测试给出了更清晰的日志警告它是调用方法 appendPartWithFileURL

的结果

 <Warning>: my_log: Failed to  append file: The operation couldn’t be completed. File URL not reachable.
deny(1) file-read-metadata /private/var/mobile/Media/DCIM/100APPLE/IMG_0008.MOV
 15:41:25 iPhone-6s kernel[0] <Notice>: Sandbox: My_App(396) deny(1) file-read-metadata /private/var/mobile/Media/DCIM/100APPLE/IMG_0008.MOV
 15:41:25 iPhone-6s My_App[396] <Warning>: my_log: Failed to  append file: The file “IMG_0008.MOV” couldn’t be opened because you don’t have permission to view it.

这是用于从 PHAsset 获取本地文件路径的代码

if (mPhasset.mediaType == PHAssetMediaTypeImage) {

    PHContentEditingInputRequestOptions * options = [[PHContentEditingInputRequestOptions alloc]init];
    options.canHandleAdjustmentData = ^BOOL(PHAdjustmentData *adjustmeta){
        return YES;
    };

    [mPhasset requestContentEditingInputWithOptions:options completionHandler:^(PHContentEditingInput * _Nullable contentEditingInput, NSDictionary * _Nonnull info) {

        dataResponse(contentEditingInput.fullSizeImageURL);

    }];
}else if(mPhasset.mediaType == PHAssetMediaTypeVideo){
    PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
    options.version = PHVideoRequestOptionsVersionOriginal;

    [[PHImageManager defaultManager] requestAVAssetForVideo:mPhasset options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
        if ([asset isKindOfClass:[AVURLAsset class]]) {
            NSURL *localVideoUrl = [(AVURLAsset *)asset URL];
            dataResponse(localVideoUrl);

        }



    }];
}

所以问题还是一样——上传到服务器的文件是空的

Answer 1

上面提出的解决方案只是部分正确(之前是我自己发现的)。由于系统不允许读取沙箱外的文件，因此无法通过文件路径访问(读/写)文件，只能复制文件。 iOS 9及以上版本Photos Framework提供API(不能通过 NSFileManager ，只能使用Photos framework api)将文件复制到你App的沙箱目录中。这是我在挖掘文档和头文件后使用的代码。

首先复制一个文件到应用程序沙箱目录。

// Assuming PHAsset has only one resource file. 
        PHAssetResource * resource = [[PHAssetResource assetResourcesForAsset:myPhasset] firstObject];

    +(void)writeResourceToTmp: (PHAssetResource*)resource pathCallback: (void(^)(NSURL*localUrl))pathCallback {
      // Get Asset Resource. Take first resource object. since it's only the one image.
        NSString *filename = resource.originalFilename;
        NSString *pathToWrite = [NSTemporaryDirectory() stringByAppendingString:filename];
        NSURL *localpath = [NSURL fileURLWithPath:pathToWrite];
        PHAssetResourceRequestOptions *options = [PHAssetResourceRequestOptions new];
        options.networkAccessAllowed = YES;
        [[PHAssetResourceManager defaultManager] writeDataForAssetResource:resource toFile:localpath options:options completionHandler:^(NSError * _Nullable error) {
            if (error) {
                [Sys MyLog: [NSString stringWithFormat:@"Failed to write a resource: %@",[error localizedDescription]]];
            }

            pathCallback(localpath);
        }];

   } // Write Resource into Tmp

上传任务本身

      NSURLRequest *urlRequest =  [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" 
            URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
         // Assuming PHAsset has only one resource file. 

        PHAssetResource * resource = [[PHAssetResource assetResourcesForAsset:myPhasset] firstObject];

        [FileHelper writeResourceToTmp:resource pathCallback:^(NSURL *localUrl)
               {
 [formData appendPartWithFileURL: localUrl name:@"data" fileName:entity.filename mimeType:mimeType error:&fileappenderror];

       }]; // writeResourceToTmp

    }// End Url Request

    AFHTTPRequestOperation * operation = [[AFHTTPRequestOperation alloc ] initWithRequest:urlRequest];
    //.....
    // Further steps are described in the AFNetworking Docs

这种上传方法有一个明显的缺点。如果设备进入“ sleep 模式”，你就完蛋了。因此，这里推荐的上传方法是使用方法。uploadTaskWithRequest:fromFile:progress:completionHandler在 AFURLSessionManager.

中

对于低于 iOS 9 的版本。如果是图像，您可以从 PHAsset 中获取 NSDATA，如我问题的代码所示......并上传。或者在上传之前先将其写入您的应用程序沙箱存储。这种方法在大文件的情况下不可用。或者，您可能希望使用图像/视频选择器将文件导出为 ALAsset。 ALAsset 提供了允许您从存储中读取文件的 api。但是您必须在上传之前将其写入沙盒存储。