如何在iOS 10通知中获取应用程序状态？

import UserNotifications

class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        // 设置UNUserNotificationCenterDelegate
        UNUserNotificationCenter.current().delegate = self
        
        // 请求用户授权显示通知
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
            if granted {
                // 用户授权
                application.registerForRemoteNotifications()
            } else {
                // 用户未授权
            }
        }
        
        return true
    }
    
    // 接收到通知时调用
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        
        // 处理通知
        
        // 可以选择是否在前台显示通知
        completionHandler([.alert, .sound, .badge])
    }
    
    // 用户点击通知时调用
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        
        // 处理通知
        
        completionHandler()
    }
}