iOS中Socket

iOS中Socket编程有实现方式有：
一、使用系统自带CFsocket
导入头文件：

#import 
#import 
#import 
#import 

二、利用第三方框架CocoaAsynSocket

1、利用CocoaAsynSocket实现Socket服务端
#import "ViewController.h"
#import "GCDAsyncSocket/GCDAsyncSocket.h"

@interface ViewController () 
@property(nonatomic,strong) GCDAsyncSocket *serverSocket;
@property(nonatomic,strong) NSMutableArray *clientSocketArray;  //保存客服端的所有Socket

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self start];
//    [[NSRunLoop currentRunLoop] run];  调用运行循环 保证线程一直开启
    
}

-(NSMutableArray *)clientSocketArray
{
    if (!_clientSocketArray) {
        _clientSocketArray = [NSMutableArray array];
    }
    
    return _clientSocketArray;
}


//开启服务端监听
-(void)start
{
    GCDAsyncSocket *serverSocket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_global_queue(0, 0)];
    
    NSError *error = nil;
    [serverSocket acceptOnPort:8888 error:&error];
    if (!error) {
        NSLog(@"服务端已经开启");
    } else {
        NSLog(@"服务端开启失败");
    }
    
    self.serverSocket = serverSocket;   //需要对服务端Socket进行强引用,否则创建完就销毁了
    
    
}
#pragma mark -  有客户端链接
//sock为服务端socket,newSocket为客户端socket
-(void)socket:(GCDAsyncSocket *)sock didAcceptNewSocket:(GCDAsyncSocket *)newSocket
{
    NSLog(@"有客服端连接服务器%@----%@",sock,newSocket);
    [self.clientSocketArray addObject:newSocket];    //需要将客户端的socket保存到数组,这样才能保证newSocket持续存在
    
    //当客户端一连接成功就发送数据给它
    NSMutableString *serverceStr = [NSMutableString string];
    [serverceStr appendString:@"欢迎来到10086在线服务,请输入下面数组"];
    [serverceStr appendString:@"[0]在线充值"];
    [serverceStr appendString:@"[4]退出"];
    
//    向调用方法的socket写入数据即是这里是向客户端socket发送数据
    [newSocket writeData:[serverceStr dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];
    
    
    //监听客户端发送数据
    [newSocket readDataWithTimeout:-1 tag:0];
    
}

#pragma mark - 读取客户端请求的数据
//当一个socket已经把数据读入内存中时被调用。如果发生错误则不被调用
-(void)socket:(GCDAsyncSocket *)clientSocket didReadData:(NSData *)data withTag:(long)tag
{
     //将客户端输入的数据转化为整数 根据数字回复不同的内容
    NSString *tempStr = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    NSUInteger num = [tempStr integerValue];
    NSString *reseponseStr = nil;
    switch (num) {
        case 1:
            reseponseStr = @"充值话费忙\n";
            break;
        case 4:
            reseponseStr = @"恭喜你成功退出\n";
            break;
            
        default:
            break;
    }
    //处理请求返回数据给客户端
    [clientSocket writeData:[reseponseStr dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];
    
    if (num == 4) {  //当用户输入数字4时 即断开链接只要将客户端的socket从clientSocketArray中删除即可
        [self.clientSocketArray removeObject:clientSocket];
    }
    
#warning mark - 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];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

2、利用CocoaAsynSocket实现Socket客户端（未完，待续)