AFNetworking +大下载文件+简历下载

Question

我需要使用AFNetworking下载文件> 500 Mo. 有时,下载它们的时间大于10分钟,如果应用程序处于后台,则下载无法完成.

所以我想尝试部分下载.我找到了很多链接,这似乎可以在AFHTTPRequestOperation上使用pause()和resume()方法.

实际上,我做了:

  [self.downloadOperation setShouldExecuteAsBackgroundTaskWithExpirationHandler:^{   
    // Clean up anything that needs to be handled if the request times out
    [self.downloadOperation pauseDownload];
  }];

DownloadOperation是AFHTTPRequestOperation(singleton)的子类.

在AppDelegate中:

- (void)applicationWillEnterForeground:(UIApplication *)application
{
  // resume will only resume if it's paused...
  [[DownloadHTTPRequestOperation sharedOperation] resumeDownload];  
}

服务器可以在标题中获取新范围...

我的问题:

1)是不是这样做的好方法？2)简历是否需要更改outputStream(追加:NO =>追加:是)？或者它是由AFNetworking管理的吗？(找不到)

self.outputStream = [NSOutputStream outputStreamToFileAtPath:self.filePath append:YES];

像这样的东西(在DownloadHTTPRequestOperation中):

- (void)pauseDownload
{
  NSLog(@"pause download");
  [self pause];
}

- (void)resumeDownload
{
  NSLog(@"resume download");
  self.outputStream = [NSOutputStream outputStreamToFileAtPath:self.filePath append:YES];
  [self resume];
}

谢谢你的帮助.

Answer 1

更新:

由于steipete可能不再维护AFDownloadRequestOperation(https://github.com/steipete/AFDownloadRequestOperation/pull/68).NSURLSessionDownloadTask可能是更好的选择.

https://github.com/steipete/AFDownloadRequestOperation

另外,我在AFDownloadRequestOperation上编写了一个lib库:https://github.com/BB9z/RFDownloadManager

Answer 2

我最终使用旧的（非 ARC）ASIHTTPRequest框架来完成类似的任务。AllowResumeForFileDownloads可以满足您的需要。请注意，您的服务器需要支持通过读取Range http 标头来恢复。

if (![[NSFileManager defaultManager] fileExistsAtPath:downloadPath]){
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setDelegate:self];
    [request setAllowResumeForFileDownloads:YES];
    [request setDownloadDestinationPath:downloadPath];
    [request setTemporaryFileDownloadPath:tmpPath];
    [request startAsynchronous];
}