GCDAsyncSocket的使用

@interface ViewController (){
NSInputStream *_inputStream;
NSOutputStream *_outputSteam;
GCDAsyncSocket *_socket;
}
* 存储所有聊天数据的数组
*/
@property (strong, nonatomic)NSMutableArray *msgs;
@end

@implementation ViewController
-(NSMutableArray *)msgs{
if (!_msgs) {
_msgs = [NSMutableArray array];
}
return _msgs;
}
- (IBAction)connectToServer:(id)sender {
//ios里实现sokcet的连接，使用C语言

// 1.与服务器通过三次握手建立连接NSString *host = @"127.0.0.1";int port = 12345;//全局队列 主队列//创建一个socket对象// 全局队列 -》 代理的方法是在子线程被调用//_socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)];// 主队列 -》 代理的方法是在主线程被调用_socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];// ?到底使用全局队列还是主队列？？// 如果代理要做耗时的操作使用全局队列，如果代理不需要做未时的操作使用主队列//连接NSError *error = nil;[_socket connectToHost:host onPort:port error:&error];if (error) {    NSLog(@"%@",error);}

}

pragma mark -socket的代理

pragma mark 连接成功

-(void)socket:(GCDAsyncSocket )sock didConnectToHost:(NSString )host port:(uint16_t)port{
NSLog(@”%s”,func);
}

pragma mark 断开连接

-(void)socketDidDisconnect:(GCDAsyncSocket )sock withError:(NSError )err{

if (err) {    NSLog(@"连接失败");}else{    NSLog(@"正常断开");}

}

pragma mark 数据发送成功

-(void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag{
NSLog(@”%s”,func);

//发送完数据手动读取[sock readDataWithTimeout:-1 tag:tag];

}

pragma mark 读取数据

-(void)socket:(GCDAsyncSocket )sock didReadData:(NSData )data withTag:(long)tag{

//代理是在子线程调用NSLog(@"%@",[NSThread currentThread]);NSString *receiverStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];if (tag == 101) {//登录指定}else if(tag == 102){//聊天数据    [self.msgs addObject:receiverStr];    //刷新表格    [self.tableView reloadData];}NSLog(@"%s %@",__func__,receiverStr);

}

• (IBAction)loginBtnClick:(id)sender {
  //发送登录请求 使用输出流

  //拼接登录的指令 iam:zhangsan
  NSString *loginStr = @”iam:zhangsan”;

  //-1不设置超时
  [_socket writeData:[loginStr dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:101];

}

pragma mark 读取服务器返回的数据

-(void)readData{

//定义缓冲区 这个缓冲区只能存储1024字节uint8_t buf[1024];// 读取数据// len为服务器读取到的实际字节数NSInteger len = [_inputStream read:buf maxLength:sizeof(buf)];// 把缓冲区里的实现字节数转成字符串NSString *receiverStr = [[NSString alloc] initWithBytes:buf length:len encoding:NSUTF8StringEncoding];NSLog(@"%@",receiverStr);//把数据添加到msgs数组[self.msgs addObject:receiverStr];//刷新表格[self.tableView reloadData];

}

pragma mark TextField的返回按钮监听

-(BOOL)textFieldShouldReturn:(UITextField *)textField{

//发送聊天数据// 1.有数据才发送NSString *txt = textField.text;if (txt.length == 0) return YES;// 发送数据NSString *msg = [@"msg:" stringByAppendingString:txt];[_socket writeData:[msg dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:102];return YES;

}