如何在iOS设备上选择映像期间保持socket.io连接处于活动状态

import SocketIO

let manager = SocketManager(socketURL: URL(string: "http://your-server-url.com:port")!, config: [.log(true), .compress])
let socket = manager.defaultSocket

socket.connect()

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    let manager = SocketManager(socketURL: URL(string: "http://your-server-url.com:port")!, config: [.log(true), .compress])
    var socket: SocketIOClient?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // 初始化socket.io连接
        socket = manager.defaultSocket
        socket?.connect()

        // 添加应用程序进入后台的通知观察者
        NotificationCenter.default.addObserver(self, selector: #selector(applicationDidEnterBackground), name: UIApplication.didEnterBackgroundNotification, object: nil)

        // 添加应用程序进入前台的通知观察者
        NotificationCenter.default.addObserver(self, selector: #selector(applicationWillEnterForeground), name: UIApplication.willEnterForegroundNotification, object: nil)

        return true
    }

    @objc func applicationDidEnterBackground() {
        // 断开socket.io连接
        socket?.disconnect()
    }

    @objc func applicationWillEnterForeground() {
        // 重新连接socket.io
        socket?.connect()
    }

    // ...
}