iPhone在后台收集CoreMotion数据。 （超过10分钟）
我正在尝试在后台收集coreMotion加速数据超过10分钟。 这一定是可能的，因为像睡眠周期这样的应用程序。
我只想确保这是允许的，因为它似乎不是其中之一：
Apps that play audible content to the user while in the background, such as a music player app Apps that record audio content while in the background. Apps that keep users informed of their location at all times, such as a navigation app Apps that support Voice over Internet Protocol (VoIP) Apps that need to download and process new content regularly Apps that receive regular updates from external accessories Apps that implement these services must declare the services they support and use system frameworks to implement the relevant aspects of those services. Declaring the services lets the system know which services you use, but in some cases it is the system frameworks that actually prevent your application from being suspended. 不过，我已经尝试了以下步骤来获得后台任务，但是我认为CoreMotion有一个更好的方法：
标题：
UIBackgroundTaskIdentifier bgTask;
码：
// if the iOS device allows background execution, // this Handler will be called - (void)backgroundHandler { NSLog(@"### -->VOIP backgrounding callback"); UIApplication* app = [UIApplication sharedApplication]; bgTask = [app beginBackgroundTaskWithExpirationHandler:^{ [app endBackgroundTask:bgTask]; bgTask = UIBackgroundTaskInvalid; }]; // Start the long-running task dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ while (1) { NSLog(@"BGTime left: %f", [UIApplication sharedApplication].backgroundTimeRemaining); [self doSomething]; sleep(1); } }); - (void)applicationDidEnterBackground:(UIApplication *)application { BOOL backgroundAccepted = [[UIApplication sharedApplication] setKeepAliveTimeout:600 handler:^{ [self backgroundHandler]; }]; if (backgroundAccepted) { NSLog(@"VOIP backgrounding accepted"); } UIApplication* app = [UIApplication sharedApplication]; bgTask = [app beginBackgroundTaskWithExpirationHandler:^{ [app endBackgroundTask:bgTask]; bgTask = UIBackgroundTaskInvalid; }]; // Start the long-running task dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ while (1) { NSLog(@"BGTime left: %f", [UIApplication sharedApplication].backgroundTimeRemaining); [self doSomething]; sleep(1); } }); }
使用这个：
Apps that keep users informed of their location at all times, such as a navigation app
换句话说，你做一个位置pipe理员，并告诉它开始做更新。 你不必对这些更新做任何事情！ 但只要发生这种情况 – 即只要您的应用程序继续在后台执行位置更新，您的应用程序也可以在后台使用Core Motion。 这不只是一个窍门， 这是苹果的官方政策，正如在几年前的WWDCvideo中所解释的那样。