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"

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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