Swift开发：GCDAsyncSocket通信之TCP 客户端

1 功能需求：

1 在Swift下使用GCDAsyncSocket实现简单的信息收发功能

2 Mac下为tcp客户端，windows下为tcp服务器

2 效果图：











3 swift代码：需要导入GCDAsyncSocket库文件，可去github下载

import UIKit

class ViewController:
UIViewController,
GCDAsyncSocketDelegate {

@IBOutlet var serveripInput:
UITextField!

@IBOutlet var msgInput:
UITextField!

@IBOutlet var conBtn:
UIButton!

@IBOutlet var sendBtn:
UIButton!

@IBOutlet var msgView:
UITextView!

let serverPort: UInt16 =
9050

var clientSocket:
GCDAsyncSocket!

var mainQueue =
dispatch_get_main_queue()

override func viewDidLoad() {

super.viewDidLoad()

}

//连接服务器按钮事件

@IBAction func conBtnClick(sender:
AnyObject) {

do {

clientSocket = GCDAsyncSocket()

clientSocket.delegate =
self

clientSocket.delegateQueue =
dispatch_get_global_queue(0,
0)

try
clientSocket.connectToHost(serveripInput.text!,
onPort: serverPort)

conBtn.backgroundColor =
UIColor.blueColor()
}

catch {

print("error")

conBtn.backgroundColor =
UIColor.redColor()
}

}

func socket(sock:
GCDAsyncSocket!, didConnectToHost host: String!, port:
UInt16) {

print("与服务器连接成功！")

clientSocket.readDataWithTimeout(-1, tag:
0)

}

func socketDidDisconnect(sock:
GCDAsyncSocket!, withError err: NSError!) {

print("与服务器断开连接")
}

func socket(sock:
GCDAsyncSocket!, didReadData data: NSData!, withTag tag:
Int) {

// 1
获取客户的发来的数据 ，把 NSData
转 NSString

let readClientDataString:
NSString? = NSString(data: data, encoding:
NSUTF8StringEncoding)

print(readClientDataString!)

// 2
主界面ui 显示数据

dispatch_async(mainQueue, {

let showStr:
NSMutableString = NSMutableString()
showStr.appendString(self.msgView.text)
showStr.appendString(readClientDataString!
as String)
showStr.appendString("\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.appendString("ok\n")

clientSocket.writeData(serviceStr.dataUsingEncoding(NSUTF8StringEncoding), 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.readDataWithTimeout(-1, tag:
0)
}

//发送消息按钮事件

@IBAction func sendBtnClick(sender:
AnyObject) {

// 1.处理请求，返回数据给客户端 ok

let serviceStr:
NSMutableString = NSMutableString()
serviceStr.appendString(self.msgInput.text!)
serviceStr.appendString("\n")

clientSocket.writeData(serviceStr.dataUsingEncoding(NSUTF8StringEncoding), withTimeout: -1,
tag: 0)
}
}