IOS 6.0 下 在输入中文时 按下锁屏键 导致的闪退问题

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

   

UIDevice * device = [UIDevice currentDevice];  

    BOOL backgroundSupported = NO;  

    if ([device respondsToSelector:@selector(isMultitaskingSupported)]) {  

        backgroundSupported = device.multitaskingSupported;  

    }  

        

    __block UIBackgroundTaskIdentifier backgroundTask;  

        

    if (backgroundSupported) {  

        backgroundTask = [application beginBackgroundTaskWithExpirationHandler:^{  

            [application endBackgroundTask:backgroundTask];  

            backgroundTask = UIBackgroundTaskInvalid;  

        }];  

    }  

   

   

}