ios - iPhone 锁定时网络连接失败

Question

我开发了一个应用程序，如果 iPhone 被锁定，服务器当时会响应，该应用程序会发出 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”。当手机锁定时，如何保持网络连接，并如何在手机再次解锁或在后台时允许应用程序接收响应。当用户在收到响应时终止应用程序时，应用程序也会崩溃。

Answer 1

您应该看看Background Execution and Multitasking 。它允许您的应用在后台运行长达约 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;
    });
}