Swift3.0 — CocoaAsyncSocket客户端（Socket通信）

CocoaAsyncSocket直接从GitHub下载： 
​​​https://github.com/robbiehanson/CocoaAsyncSocket​​

怎么使用CocoaAsyncSocket呢？ 

我用的是最直接的方法，下载下来解压后是下面的文件，找到这两个文件，我们用GCDAsyncSocket（TCP），直接将这两个文件拖进xCode8 

 

 

将这两个文件拖进xCode后它会提示你是否建立一个Bridge-Header，就点击Create。 

然后点击这个头文件并输入

#import "GCDAsyncSocket.h"

• 1

这时候按下Command+B重新编译一下。这样CocoaAsyncSocket就导入完毕了。

下面是客户端界面 

进入ViewController.swift

//
//  ViewController.swift
//  AsyncSocket_Exp
//
//  Created by 大老虎 on 2016/11/27.
//  Copyright © 2016年 Tiger. All rights reserved.
//

import UIKit

class ViewController: UIViewController, GCDAsyncSocketDelegate {

    @IBOutlet weak var serveripInput: UITextField!
    @IBOutlet weak var msgInput: UITextField!
    @IBOutlet weak var conBtn: UIButton!
    @IBOutlet weak var sendBtn: UIButton!
    @IBOutlet weak var msgView: UITextView!

    let serverPort: UInt16 = 6666

    var clientSocket:GCDAsyncSocket!

    override func viewDidLoad() {
        super.viewDidLoad()
        sendBtn.isEnabled = false // Socket未连接成功时发送按钮不能用
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // 连接服务器按钮事件
    @IBAction func conBtnClick(_ sender: AnyObject) {
        if serveripInput.text?.isEmpty == false { // 如果IP地址不为空则开始连接Socket
            clientSocket = GCDAsyncSocket()
            clientSocket.delegate = self
            clientSocket.delegateQueue = DispatchQueue.global()
            do {
                try clientSocket.connect(toHost: serveripInput.text!, onPort: serverPort)
            } catch {
                print("try connect error: \(error)")
                conBtn.backgroundColor = UIColor.red
            }
        } else {
            msgView.insertText("IP地址不能为空！\n")
        }
    }

    func socket(_ sock: GCDAsyncSocket, didConnectToHost host: String, port: UInt16) -> Void {
        print("connect success")
        sendBtn.isEnabled = true // 连接成功后发送按钮设为可用
        clientSocket.readData(withTimeout: -1, tag: 0)
    }

    func socketDidDisconnect(_ sock: GCDAsyncSocket, withError err: Error?) -> Void {
        print("connect error: \(err)")
    }

    func socket(_ sock: GCDAsyncSocket, didRead data: Data, withTag tag: Int) -> Void {
        // 1、获取客户端发来的数据，把 NSData 转 NSString
        let readClientDataString: NSString? = NSString(data: data as Data, encoding: String.Encoding.utf8.rawValue)
        print("---Data Recv---")
        print(readClientDataString)

        // 2、主界面UI显示数据
        DispatchQueue.main.async {
            let showStr: NSMutableString = NSMutableString()
            showStr.append(self.msgView.text)
            showStr.append(readClientDataString! as String)
            showStr.append("\r\n")
            self.msgView.text = showStr as String
        }

        // 3、处理请求，返回数据给客户端OK
        let serviceStr: NSMutableString = NSMutableString()
        serviceStr.append("OK")
        serviceStr.append("\r\n")
        clientSocket.write(serviceStr.data(using: String.Encoding.utf8.rawValue)!, withTimeout: -1, tag: 0)

        // 4、每次读完数据后，都要调用一次监听数据的方法
        clientSocket.readData(withTimeout: -1, tag: 0)
    }

    // 发送消息按钮事件
    @IBAction func sendBtnClick(_ sender: AnyObject) {
        if msgInput.text?.isEmpty == false { // 如果消息不为空则发送
            let serviceStr: NSMutableString = NSMutableString()
            serviceStr.append(self.msgInput.text!)
            serviceStr.append("\r\n")
            clientSocket.write(serviceStr.data(using: String.Encoding.utf8.rawValue)!, withTimeout: -1, tag: 0)
        }
    }

}

到这里客户端程序就完成了，可以用iOS模拟器来跑一下。 

SocketTool截图为 

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