为什么后台任务在10分钟后结束

Question

I am badly in need of a background task to run always, when application is in background.

It is needed for a voip application. All steps are done for voip app.

I am using following script to run background task

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    UIApplication *app = [UIApplication sharedApplication];
    UIBackgroundTaskIdentifier bgTask;
    self.bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
        [app endBackgroundTask:self.bgTask];
    }];
}

After using it, when application goes to background, within 10 minutes if a sip call comes UILocalnotification appear. but after 10 minutes if a sip call comes UILocalnotification did not appear.

Please anybody help me.

Answer 1

您是否已将voip作为背景模式添加到应用程序Info.plist文件中的UIBackgroundModes项中？

Answer 2

There may be a possibility that your app is crashing because of many requests in background.I hope that you already followed these steps:

There are several requirements for implementing a VoIP app:

• Add the UIBackgroundModes key to your app's Info.plist file. Set the value of this key to an array that includes the voip string.

  • Configure one of the app's sockets for VoIP usage.

  • Before moving to the background, call the

  • setKeepAliveTimeout:handler: method to install a handler to be

  • executed periodically. Your app can use this handler to maintain its service connection.

  • Configure your audio session to handle transitions to and from active use.

  To ensure a better user experience on iPhone, use the Core Telephony framework to adjust your behavior in relation to cell-based phone calls; see Core Telephony Framework Reference.

• To ensure good performance for your VoIP app, use the System Configuration framework to detect network changes and allow your app to sleep as much as possible.