//今天遇到了一个问题
//applicationWillTerminate:(UIApplication *)application 在退出程序时不执行怎么办?
//答案:直接上代码...

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

  NSLog(@"%s", PRETTY_FUNCTION);
  __block UIBackgroundTaskIdentifier identifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
  if (identifier != UIBackgroundTaskInvalid) {
  [[UIApplication sharedApplication] endBackgroundTask:identifier];
  identifier = UIBackgroundTaskInvalid;
  }
  }];

  dispatch_async(dispatch_get_main_queue(), ^{
  NSLog(@"执行进入后台调用的方法...");

   //此处写正常进入后台时程序需要执行的动作
  
    if (identifier != UIBackgroundTaskInvalid) {
        [[UIApplication sharedApplication] endBackgroundTask:identifier];
        identifier = UIBackgroundTaskInvalid;
    }
  

  });
  }

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

//此方法内写程序将要退出时需要执行的动作

// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

NSLog(@"%s", __PRETTY_FUNCTION__);
[self.backView removeFromSuperview];
[self.manager closeSocketServer];
[self.conn stopNotifier];
[[NSNotificationCenter defaultCenter]removeObserver:self];

}