3

崩溃报告详细信息:

Hardware Model:      iPhone5,2
Exception Type:  00000020
Exception Codes: 0x000000008badf00d
Highlighted Thread:  3

Application Specific Information:
MyApp[1369] has active assertions beyond permitted time: 
{(
<BKProcessAssertion: 0x175ca7d0> identifier: Called by MyApp, from -[AppDelegate applicationDidEnterBackground:] process: MyApp[1369] permittedBackgroundDuration: 180.000000 reason: finishTask owner pid:1369 preventSuspend  preventIdleSleep      preventSuspendOnSleep 
)}

线程 3:

Thread 3 name:  com.apple.NSURLConnectionLoader
Thread 3:
0   libsystem_kernel.dylib          0x3937ea50 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x3937e848 mach_msg + 36
2   CoreFoundation                  0x2e61261c __CFRunLoopServiceMachPort + 152
3   CoreFoundation                  0x2e610d3c __CFRunLoopRun + 788
4   CoreFoundation                  0x2e57b7a4 CFRunLoopRunSpecific + 520
5   CoreFoundation                  0x2e57b586 CFRunLoopRunInMode + 102
6   Foundation                      0x2efbb23c +[NSURLConnection(Loader)     _resourceLoadLoop:] + 316
7   Foundation                      0x2f030a0a __NSThread__main__ + 1058
8   libsystem_pthread.dylib         0x393f8956 _pthread_body + 138
9   libsystem_pthread.dylib         0x393f88c6 _pthread_start + 98
10  libsystem_pthread.dylib         0x393f6ae4 thread_start + 4

我的应用程序在“applicationDidEnterBackground”处使用带有此代码的后台任务:

// 10min background task
UIBackgroundTaskIdentifier myLongTask;
myLongTask = [[UIApplication sharedApplication]
              beginBackgroundTaskWithExpirationHandler:^{
                  [locationMgrInstance timerSet];
              }];
// cell change  
[locationMgrInstance startMonitoringSignificantLocationChanges];

它在 iOS 6 上运行良好......但是!iOS 7 在 180 秒后抛出断言。帮助!

4

1 回答 1

11

此消息表明您的后台任务运行时间过长。iOS7 改变了后台处理的某些方面。特别是后台任务应该在短时间内完成,如果没有完成,您的应用程序将被终止。您需要查看后台任务的运行方式。特别是,您需要确保[[UIApplication sharedApplication] endBackgroundTask:task];及时致电。您还应该在过期处理程序中调用此方法。

查看Apple iOS App Programming Guide Background Execution Guide中的 Background Execution and Multitasking 部分。

此外,您可以检查[[UIApplication sharedApplication]backgroundTimeRemaining]- 在 iOS 6 上这开始于 10 分钟。在 iOS 7 中,它从 3 分钟开始 - 这就是你在 180 秒后超时的原因。你需要重新评估你的后台策略来处理新的限制。

于 2014-03-27T07:55:47.050 回答