iPhone 锁定时网络连接失败

Question

我开发了一个应用程序，当 iPhone 被锁定时服务器响应时会发出一个 http 请求（异步调用）。网络连接失败，我收到错误代码 -1005“网络连接失败”。如何在手机锁定时保持网络连接，并在手机再次解锁或在后台允许应用程序接收响应。当用户在收到响应时杀死应用程序时，应用程序也会崩溃。

Answer 1

你应该看看Background Execution and Multitasking。它允许您的应用在后台运行大约 10 分钟。

以下是文档中的示例代码：

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    bgTask = [application beginBackgroundTaskWithExpirationHandler:^{
        // Clean up any unfinished task business by marking where you.
        // stopped or ending the task outright.
        [application endBackgroundTask:bgTask];
        bgTask = UIBackgroundTaskInvalid;
    }];

    // Start the long-running task and return immediately.
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        // Do the work associated with the task, preferably in chunks.

        [application endBackgroundTask:bgTask];
        bgTask = UIBackgroundTaskInvalid;
    });
}