相关疑难解决方法(0)

Xcode 9(iOS 11)在注册Push(远程)通知时向我显示错误/警告.

这是错误消息

这是代码,我尝试过:

let center  = UNUserNotificationCenter.current()
center.delegate = self
center.requestAuthorization(options: [.sound, .alert, .badge]) { (granted, error) in
        if error == nil{
              UIApplication.shared.registerForRemoteNotifications()
        }
 }

错误/警告线:

UIApplication.shared.registerForRemoteNotifications()

怎么解决这个？