解码推送通知PKPushPayload AnyHashable时出错

Question

我在下面的代码中解码AnyHashable，看来我做错了。 twiFrom为零。任何人都可以纠正错误并提供正确的解码方法吗？ Tx

有效载荷：

payload.dictionaryPayload：[AnyHashable（“ aps”）：{ }，AnyHashable（“ twi_to”）：客户端：client3，AnyHashable（“ twi_from”）：客户端：client2，AnyHashable（“ twi_account_sid”）：A959d，AnyHashable（“ twi_bridge_token”）：eyJraWjoyI，AnyHashable（_twi_message： .voice.call，AnyHashable（“ twi_call_sid”）：CAf56，AnyHashable（“ twi_message_id”）：RU6]

func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, for type: PKPushType, completion: @escaping () -> Void) {

    if (type == PKPushType.voIP) {

        print("payload.dictionaryPayload: \(payload.dictionaryPayload)")
        let twiFrom = payload.dictionaryPayload["twi_from"] as? Dictionary<String, String> // ERROR: Nil
        let fromClient = twiFrom?["client"]
        print ("fromClient: \(fromClient!)")
}