Swift 设置里该APP是否开启了推送通知的权限

// 通知的认证状态
func checkPushNotification(){
    if #available(iOS 10.0, *) {
        UNUserNotificationCenter.current().getNotificationSettings(){ (setttings) in
            switch setttings.authorizationStatus{
            case .authorized:
                print("The application is authorized to post user notifications.")
            case .denied:
                print("The application is not authorized to post user notifications.")
            case .notDetermined:
                print("The user has not yet made a choice regarding whether the application may post user notifications.")
            case .provisional:
                print("The application is authorized to post non-interruptive user notifications.")
            case .ephemeral:
                print("The application is temporarily authorized to post notifications. Only available to app clips.")
            @unknown default:
                print("something vital went wrong here")
            }
        }
    } else {
        let isNotificationEnabled = UIApplication.shared.currentUserNotificationSettings?.types.contains(UIUserNotificationType.alert)
        if isNotificationEnabled == true{
            print("enabled notification setting")
        }else{
            print("setting has been disabled")
        }
    }
}