后台强制关闭APP时调用的检测方法

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

    //后台关闭APP时 进行下面的设置 可调用 -(void)applicationDidBecomeActive:(UIApplication *)application;

    __block UIBackgroundTaskIdentifier identifier = [[UIApplicationsharedApplication]beginBackgroundTaskWithExpirationHandler:^{

        if (identifier != UIBackgroundTaskInvalid) {

            [[UIApplication sharedApplication] endBackgroundTask:identifier];

            identifier = UIBackgroundTaskInvalid;

        }

    }];

    NSLog(@"进入后台");

}

• (void)applicationWillTerminate:(UIApplication *)application

{     NSLog(@"12");    }