ios - IOS 7后台任务间隔时间

Question

我在 appdidEnterBackground() 中有以下代码，我看到在 IOS 6 中后台时间大约为 10 分钟，而 IOS 7 中的相同代码打印了 2 分钟。

代码如下:

-(void)applicationDidEnterBackground:(UIApplication *)application
{        

backgroundTaskIdentifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
            [[UIApplication sharedApplication] endBackgroundTask:backgroundTaskIdentifier];
            backgroundTaskIdentifier = UIBackgroundTaskInvalid;

         }];

        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

            NSTimeInterval timeInterval = [[UIApplication sharedApplication] backgroundTimeRemaining];


            NSLog(@" time remaining in background = %f",timeInterval);
 });
}

问题是:如何在 IOS 7 中将后台时间从 2 分钟增加到大约 10 分钟？有什么我想念的吗？

Answer 1

Read the iOS 7 release notes. This is the new behavior. You can't change it. (rmaddy)
It's exactly 180s so 3min (and not 2min) :) (Gros)

注意
为了维护秩序，我按照这个问题的答案:What to do with questions that have been self-resolved as a comment instead of an answer?(标记为社区维基)