经过大量的苹果文档阅读，我发现如果用户强制退出应用程序，方法 (didReceiveRemoteNotification: fetchCompletionHandler) 将不会调用.

After lot of apple docs reading, I found that the method (didReceiveRemoteNotification: fetchCompletionHandler) will not invoke if user has force-quit the app.

如所写，(link)但是，如果用户强制退出，系统不会自动启动您的应用程序.在这种情况下，用户必须重新启动您的应用或重新启动设备，然后系统才会再次尝试自动启动您的应用.

As written, (link) However, the system does not automatically launch your app if the user has force-quit it. In that situation, the user must relaunch your app or restart the device before the system attempts to launch your app automatically again.