clinetSocket 1、viewcontroller.h@interface ViewController : UIViewController<</span>GCDAsyncSocketDelegate,UITextFieldDelegate>{    GCDAsyncSocket *socket;}@property(strong)  GCDAsyncSocket *socket@property (strong, nonatomic) IBOutlet UITextField *host;@property (strong, nonatomic) IBOutlet UITextField *message;@property (strong, nonatomic) IBOutlet UITextField *port;@property (strong, nonatomic) IBOutlet UITextView *status;- (IBAction)connect:(id)sender;- (IBAction)send:(id)sender;@endviewcontroller.m //连接服务器- (IBAction)connect:(id)sender {    socket = [[GCDAsyncSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_main_queue()];     socket.delegate = self;    NSError *err = nil;    BOOL connState=[socket connectToHost:host.text onPort:[port.text intValue] error:&err];    if(!connState)    {         [self addText:err.description];    }else    {        NSLog(@"连接服务器：%@ 成功",host.text);        [self addText:@"打开端口"];    }}-(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{    [self addText:[NSString stringWithFormat:@"连接到:%@",host]];    [socket readDataWithTimeout:-1 tag:0];}- (void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{    NSLog(@"socket did is connect:%@",err);}//发送数据- (IBAction)send:(id)sender {    [socket writeData:[message.text dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];    [self addText:[NSString stringWithFormat:@"发送的数据:%@",message.text]];    [message resignFirstResponder];    [socket readDataWithTimeout:-1 tag:0];}//读取服务器获取的数据-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{    NSString *newMessage = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];        [self addText:[NSString stringWithFormat:@"服务器：%@:%@",sock.connectedHost,newMessage]];    [socket readDataWithTimeout:-1 tag:0];}  #pragma mark - View lifecycle-(void)addText:(NSString *)str{    status.text = [status.text stringByAppendingFormat:@"%@\n",str];}- (void)viewDidLoad{    [super viewDidLoad];    //设置默认的服务器地址和端口    host.text = @"192.168.2.107";    port.text = @"54321";    // Do any additional setup after loading the view, typically from a nib.}2、serviceSocket1、appdelegate.h #import "GCDAsyncSocket.h"#import "GCDAsyncUdpSocket.h"@interface AppDelegate : NSObject <</span>NSApplicationDelegate,GCDAsyncSocketDelegate,GCDAsyncUdpSocketDelegate>{    GCDAsyncSocket *socket;    GCDAsyncSocket *s;}@property(strong)  GCDAsyncSocket *socket;- (IBAction)listen:(id)sender;@property (unsafe_unretained) IBOutlet NSTextView *status;@property (unsafe_unretained) IBOutlet NSTextField *port;@property (unsafe_unretained) IBOutlet NSTextField *host;@property (assign) IBOutlet NSWindow *window;2、appdelegate.m @implementation AppDelegate@synthesize status;@synthesize port;@synthesize host;@synthesize window = _window;@synthesize socket;- (void)applicationDidFinishLaunching:(NSNotification *)aNotification{    //服务器的端口号    port.stringValue = http://www.mamicode.com/@"54321";}-(void)addText:(NSString *)str{    status.string = [status.string stringByAppendingFormat:@"%@\n",str];}//开始监听- (IBAction)listen:(id)sender {        NSLog(@" begin listen");    socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];    NSError *err = nil;    if(![socket acceptOnPort:[port integerValue] error:&err])     {         [self addText:err.description];    }else    {        [self addText:[NSString stringWithFormat:@"开始监听%d端口.",port.integerValue]];    }}- (void)socket:(GCDAsyncSocket *)sender didAcceptNewSocket:(GCDAsyncSocket *)newSocket{    // The "sender" parameter is the listenSocket we created.    // The "newSocket" is a new instance of GCDAsyncSocket.    // It represents the accepted incoming client connection.    // Do server stuff with newSocket...    [self addText:[NSString stringWithFormat:@"建立与%@的连接",newSocket.connectedHost]];    s = newSocket;    s.delegate = self;    [s readDataWithTimeout:-1 tag:0];}//向客户端写数据-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{    NSString *receive = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];    [self addText:[NSString stringWithFormat:@"%@:%@",sock.connectedHost,receive]];          NSString *reply = [NSString stringWithFormat:@"服务器收到:%@",receive];    [s writeData:[reply dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];    [s readDataWithTimeout:-1 tag:0];}@end