ios - 如何取消AFdownloadrequestoperation而不保留之前的进度(删除临时文件)iOS

Question

我正在从服务器下载文件。
我能够成功下载文件。但是每当我取消下载请求(中间)操作并重新开始下载时。下载从上一个进度开始(不是从零开始)。但我想从零开始重新下载。

设置 operation.deleteTempFileOnCancel = YES; 也无济于事

在给定的目标路径下没有创建文件，当我在两者之间取消下载时

operation.tempPath is returning null (not able to delete temporary file)

我正在使用下面的代码

     NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:model.downloadUrl]];
     operation = [[AFDownloadRequestOperation alloc] initWithRequest:request targetPath:path shouldResume:YES];
     operation.deleteTempFileOnCancel = YES;


            // download operation progressive block
            [operation setProgressiveDownloadProgressBlock:^(AFDownloadRequestOperation *operation, NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpected, long long totalBytesReadForFile, long long totalBytesExpectedToReadForFile)
             {
                 // calculate current download progress

                 }
             }];

            // download operation completion block
            [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
             {


             } 

            failure:^(AFHTTPRequestOperation *operation, NSError *error) {

                 // operation failed


             }];

           [operation start];

我想从零开始下载，如果中间取消了下载然后又开始了。我正在使用 iOS 7

Answer 1

好吧，我刚刚找到了一个解决方法。我会把它张贴在这里，以防其他人遇到同样的问题。

在此行之后，您可以检查是否实际创建了 tempPath

operation = [[AFDownloadRequestOperation alloc] initWithRequest:request targetPath:path shouldResume:YES];
NSLog("%@", operation.tempPath);

然后将该路径添加到字典中

NSString *tempPath = _operation.tempPath;
[self.tempPathDict setObject:tempPath forKey:your_key];

当您停止操作时调用此代码

NSString *tempPath = [self.tempPathDict objectForKey:your_key];
// Cancel the operation you want
[operation cancel];
// Remove the tempFile 
NSError *error = [[NSError alloc] init];
[[NSFileManager defaultManager] removeItemAtPath:tempPath error:&error];
// And last remove the path from the dictionary
[self.tempPathDict removeObjectForKey:your_key];