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我是iOS的菜鸟，在这里我想做一个后台WebSocket来处理来自服务器的所有事件。

import UIKit
import Starscream

class WebSocketLink: WebSocketDelegate{
    
    var isConnected:Bool = false
    
    func connect(){
        
        var request = URLRequest(url: URL(string: "\(WEBSOCKET_HOST)")!)
        request.timeoutInterval = 5
        request.setValue("sessionid=\(ACCESS_TOKEN)", forHTTPHeaderField: "Cookie")
        SOCKET = WebSocket(request: request)
        SOCKET?.delegate = self
        SOCKET?.connect()
        
    }
    
    func disconnect() {
        SOCKET?.disconnect()
    }
    
    func didReceive(event: WebSocketEvent, client: WebSocket) {
        
        switch event{
        case .connected(let headers):
            isConnected = true
            print("websocket is connected: \(headers)")
        case .disconnected(let reason, let code):
            isConnected = false
            print("websocket is disconnected: \(reason) with code: \(code)")
        case .text(let string):
            print("Received text: \(string)")
        case .binary(let data):
            print("Received data: \(data.count)")
        case .ping(_):
            break
        case .pong(_):
            break
        case .viabilityChanged(_):
            break
        case .reconnectSuggested(_):
            break
        case .cancelled:
            isConnected = false
        case .error(let error):
            isConnected = false
            print(error ?? "x")
        }
    }
    
}

这里的 SOCKET 是一个全局变量：

var SOCKET:WebSocket? = nil

我在 App init 函数中连接 WebSocket：

init(){

   let link = WebSocketLink()
   link.connect()

}

然后应用程序无法在 didReceive 函数中打印任何内容。我已经测试了 WebSocket 已连接并且它可以发送和接收（通过 javascript 测试代码）。如何通过 didReceive 函数从服务器接收数据？或者有什么更好的方法来制作后台 websocket 来处理来自服务器的所有事件？先感谢您！！！！

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