Question

有两台设备需要在后台或LockScreen中继续传输数据。

有关背景知识的主要资源可在https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html

上找到

到目前为止，我期待了解如何实现上述行为：在传输正在进行且其中一个应用程序（或两者）进入后台的情况下。显然我们已经有可恢复的转移管理工作了。

我一直在收集存根和答案，我最终得到了以下内容：

确保每个套接字都可以查看。

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

为了在Lock Screen中保持背景，我读了一个答案，说我们应该有类似于didFinishLaunchingWithOptions的结尾但是[self backgroundHandler]方法中的代码是什么？

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

return YES;

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

我按照本教程开始工作，但看起来不再维护GCDAsyncSocket，因此它只适用于iOS7。

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

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

gcdasyncsocket后台文件传输

1 个答案: