1 #import "ViewController.h"
  2 #import "GCDAsyncSocket.h"
  3 
  4 static NSString *server_host = @"127.0.0.1";
  5 static const short server_port = 6969;
  6 
  7 #define VA_Commadn_id 0x00000001
  8 
  9 @interface ViewController ()<GCDAsyncSocketDelegate>
 10 
 11 @property (strong, nonatomic) GCDAsyncSocket *clientSocket;
 12 @property (weak, nonatomic) IBOutlet UITextField *textField;
 13 
 14 @end
 15 
 16 @implementation ViewController
 17 
 18 - (void)viewDidLoad {
 19     [super viewDidLoad];
 20     // Do any additional setup after loading the view, typically from a nib.
 21     [self initGCDAsyncSocket];
 22 }
 23 
 24 - (void)initGCDAsyncSocket{
 25     //创建 Socket
 26     if (_clientSocket == nil) {
 27         _clientSocket = [[GCDAsyncSocket alloc] initWithDelegate:self
 28                                                    delegateQueue:dispatch_get_main_queue()];
 29     }
 30 }
 31 
 32 - (BOOL)connect{
 33     NSError *error = nil;
 34     BOOL connectFlag = [_clientSocket connectToHost:server_host onPort:server_port error:&error];
 35     if (error) {
 36         NSLog(@"%@",error);
 37     }
 38     return connectFlag;
 39 }
 40 
 41 - (void)disConnect{
 42     [_clientSocket disconnect];
 43 }
 44 
 45 #pragma mark -- GCDAsyncSocketDelegate
 46 //连接成功回调
 47 - (void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{
 48     NSLog(@"连接成功");
 49     
 50     [_clientSocket readDataWithTimeout:-1 tag:0];
 51 }
 52 
 53 //断开连接
 54 - (void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{
 55     NSLog(@"断开连接%@",err.localizedDescription);
 56 }
 57 
 58 //接受消息
 59 - (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
 60     NSLog(@"接受到消息");
 61     [_clientSocket readDataWithTimeout:-1 tag:0];
 62 }
 63 
 64 - (void)sendImage{
 65     //图片数据
 66     UIImage *img = [UIImage imageNamed:@"icon_socket"];
 67     NSData *imgData = UIImagePNGRepresentation(img);
 68     
 69     NSMutableData *totalData = [NSMutableData data];
 70     
 71     //0~3  总长度，前四个字节的总长度
 72     
 73     unsigned int totalSize = (int)imgData.length + 4 + 4;
 74     
 75     NSData *totalSizeData = [NSData dataWithBytes:&totalSize length:4];
 76     //数据拼接
 77     [totalData appendData:totalSizeData];
 78     
 79     // 拼接标识
 80     unsigned int commandId = VA_Commadn_id;
 81     
 82     NSData *commandIdData = [NSData dataWithBytes:&commandId length:4];
 83     
 84     [totalData appendData:commandIdData];
 85     
 86     //拼接图片数据
 87     [totalData appendData:imgData];
 88     
 89     //发送数据
 90     [_clientSocket writeData:totalData withTimeout:-1 tag:0];
 91     
 92 }
 93 
 94 
 95 #pragma mark -- Button Action
 96 
 97 - (IBAction)connectAction:(UIButton *)sender{
 98     [self connect];
 99 }
100 
101 - (IBAction)disConnectAction:(UIButton *)sender{
102     [self disConnect];
103 }
104 
105 - (IBAction)sendAction:(UIButton *)sender{
106     NSData *data = [_textField.text dataUsingEncoding:NSUTF8StringEncoding];
107     
108     [_clientSocket writeData:data withTimeout:-1 tag:0];
109 }
110 
111 - (IBAction)sendImageAction:(id)sender {
112     [self sendImage];
113 }
114 
115 
116 - (void)didReceiveMemoryWarning {
117     [super didReceiveMemoryWarning];
118     // Dispose of any resources that can be recreated.
119 }
120 
121 
122 @end

1 platform:ios, ‘9.0‘
2 
3 target "002--AsyncSocket" do
4     pod ‘CocoaAsyncSocket‘
5 end