/*NSStreamEventNone                   // 无事件NSStreamEventOpenCompleted         // 建立连接完成NSStreamEventHasBytesAvailable     // 有可读的字节，接收到了数据，可以读了NSStreamEventHasSpaceAvailable     // 可以使用输出流的空间，此时可以发送数据给服务器NSStreamEventErrorOccurred         // 发生错误NSStreamEventEndEncountered        // 流结束事件，在此事件中负责做销毁工作*/

 NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(loadDataServer:) object:url];[thread start];//添加队列

-(void)loadDataServer:(NSURL *)url
{CFReadStreamRef readStream;CFWriteStreamRef writeStream;CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)([url host]), [[url port] integerValue], &readStream, &writeStream);//建立连接
    _input = (__bridge NSInputStream *)(readStream);_output = (__bridge NSOutputStream *)(writeStream);_input.delegate = self;//设置代理[_input scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];//添加到runloop[_input open];//打开
    _output.delegate = self;[_output scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];[_output open];[[NSRunLoop currentRunLoop]run];
}

//设置对应代理
-(void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{switch (eventCode) {case NSStreamEventNone:{//无事件;
        }break;case NSStreamEventOpenCompleted:{//建立连接完成
        }break;//接收到数据，有可读字节case NSStreamEventHasBytesAvailable:{if (_receivedData == nil) {_receivedData = [[NSMutableData alloc]init];}uint8_t buffer[1024];NSInteger numBtyes = [(NSInputStream *)aStream read:buffer maxLength:sizeof(buffer)];if (numBtyes > 0) {NSString *str = [[NSString alloc]initWithBytes:buffer length:numBtyes encoding:NSUTF8StringEncoding];NSLog(@"%@",str);}}break;case NSStreamEventHasSpaceAvailable:{//可以写入数据
        }break;case NSStreamEventErrorOccurred:{//发生错误
        }break;case NSStreamEventEndEncountered:{//流结束，此处进行销毁
            [aStream close];[aStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];}break;default:break;}
}

- (IBAction)click:(id)sender {NSString *mytext = @"moxue";NSData *data = [mytext dataUsingEncoding:NSUTF8StringEncoding];[_output write:data.bytes maxLength:data.length];
}