永远不会调用NSInputStream的NSStreamEventHasBytesAvailable

Question

我正在创建一个类似于WiTap的应用程序（但要连接许多设备），这是我的问题：应用程序似乎连接设备（它们显示在表视图控制器中。NSInput/OutputStream的代表说两者流已打开，但当我将数据包发送到NSOutputStream时，与NSInputStream相对设备上的功能无法在(NSStreamEventHasBytesAvailible中调用- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode)。

以下是进行连接以及发送和接收的代码......

//Service was resolved
- (void)netServiceDidResolveAddress:(NSNetService *)netService
{
 //Get the streams from NSNetService
 NSInputStream *inStream = nil;
 NSOutputStream *outStream = nil;
 [netService getInputStream:&inStream outputStream:&outStream];
 [inStream setDelegate:self];
 [inStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
 [inStream open];
 [outStream setDelegate:self];
 [outStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
 [outStream open];
 [self.inStreams addObject:inStream];
 [self.outStreams addObject:outStream];

 //Add NSNetService between connected devices
 [self.resolvedServices addObject:netService];
 [self updateUI];
}

//event handling
- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{
 switch (eventCode) {
    case NSStreamEventHasBytesAvailable:
        {
            NSMutableData *inBuffer = [[NSMutableData alloc] init];
            NSInputStream *inStream = (NSInputStream *)aStream;
            uint8_t buffer[3];
            NSInteger len = 0;
            NSInteger packetNumber = 0;
            len = [inStream read:buffer maxLength:3];
            if(len > 0) {
                [inBuffer appendBytes:buffer length:len];
                [inBuffer getBytes:&packetNumber length:len];
                [self.delegate stream:inStream didReceivePacketNumber:[NSNumber numberWithInteger:packetNumber]];
            }
        } 
        break;
    case NSStreamEventHasSpaceAvailable:
        if ([aStream isKindOfClass:[NSOutputStream class]])
            NSLog(@"NSStream \"%@\" has space availible",aStream);
        break;
    case NSStreamEventOpenCompleted:
        if ([aStream isKindOfClass:[NSInputStream class]])
            NSLog(@"NSInputStream opened");
        else if ([aStream isKindOfClass:[NSOutputStream class]])
            NSLog(@"NSOutputStream opened");
        break;
    case NSStreamEventErrorOccurred:
        NSLog(@"NSStream \"%@\" occurred an error: %@",aStream,[aStream streamError]);
        break;
    case NSStreamEventEndEncountered:
        NSLog(@"Stream \"%@\" has been closed",aStream);
        [aStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
        [aStream close];
        NSUInteger index = 0;
        if ([aStream isKindOfClass:[NSOutputStream class]]) {
            index = [self.outStreams indexOfObject:aStream];
            [self.outStreams removeObject:aStream];
            [self.inStreams removeObjectAtIndex:index];
        } else if ([aStream isKindOfClass:[NSInputStream class]]) {
            index = [self.inStreams indexOfObject:aStream];
            [self.inStreams removeObject:aStream];
            [self.outStreams removeObjectAtIndex:index];
        }
        [self.availibleServices removeObjectAtIndex:index];
        [self.resolvedServices removeObjectAtIndex:index];
        break;
    default:
        break;
 }
}

//sending
//Data pushing into NSStreams
- (void)sendData:(NSData *)data toStream:(NSOutputStream *)aStream
{
 if ([aStream hasSpaceAvailable]) {
    NSLog(@"%i",[aStream write:[data bytes] maxLength:[data length]]);
 }
}

我尝试使用Instruments（网络事物）调试项目。它表示发送和接收数据包但事件永远不会发生。谢谢您的帮助。如果有人想要我发送整个项目没问题...