gcdasyncsocket后台文件传输

Question

在后台或LockScreen中有两个需要继续传输数据的设备。

有关背景的主要资源， 请访问https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html

到目前为止，我期待了解如何实现上述行为：在正在进行传输且其中一个应用程序（或两者都进入后台）的情况下。 显然，我们已经开始了可恢复的传输管理。

我一直在收集存根和答案，最终得到以下结果：

1. 确保每个套接字都是可后台的。

    [socket performBlock:^{ [socket enableBackgroundingOnSocket]; }]; 

2. 为了即使在锁定屏幕时也能保持背景，我读了一个回答，说我们应该在didFinishLaunchingWithOptions末尾添加类似内容，但是[self backgroundHandler]方法中包含什么代码？

    BOOL backgroundAccepted = [[UIApplication sharedApplication] setKeepAliveTimeout:600 handler:^{ [self backgroundHandler]; }]; if (backgroundAccepted) NSLog(@"background handler accepted"); return YES; 

3. UIApplication的applicationDidEnterBackground委托方法显示

    - (void)applicationDidEnterBackground:(UIApplication *)application { NSLog(@"=== DID ENTER BACKGROUND ==="); if([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)]) NSLog(@"Multitasking Supported"); else return; // Shall I remove my KVO observers when in background?? I guess NOT, right? :D //[[NSNotificationCenter defaultCenter] removeObserver:self]; UIBackgroundTaskIdentifier bgTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{ NSLog(@"End of tolerate time. Application should be suspended now if we do not ask more 'tolerance'"); // [self askToRunMoreBackgroundTask]; This code seems to be unnecessary. I'll verify it. }]; if (bgTask == UIBackgroundTaskInvalid) NSLog(@"This application does not support background mode"); else NSLog(@"Application will continue to run in background"); // Start the long-running task and return immediately. dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ }); 

Answer 1

我按照本教程进行操作，但是看起来GCDAsyncSocket不再维护，因此只能在iOS7上使用。

http://www.objc.io/issue-5/multitasking.html

要在iOS 8下进行后台文件传输，我正在使用AFNetworking库（ http://afnetworking.com ）