在iPhone上使用带有辅助线程的AsyncSocket

我在iPhone上使用AsyncSocket与服务器通信。AsyncSocket基于运行循环，但我的应用程序基于线程。这意味着，我启动一个新线程来写入数据，并等待同一线程上收到响应。但是我不能直接从另一个线程调用AsyncSocket的方法，我必须使用：

[self performSelectorOnMainThread:@selector(writeSomeData:) withObject:dataToWrite waitUntilDone:YES];

它确实可以工作，但我无法从以这种方式调用的方法“writeSomeData:”获得响应，因为performSelectorOnMainThread不返回任何内容

writeSomeData:方法执行以下操作：

-(NSData *)writeData:(NSData *)dataToWrite {
    dataReceived = nil; // AsyncSocket writes data to this variable
    [asyncSocket writeData:dataToWrite withTimeout:-1 tag:0];
    [asyncSocket readDataToData:[@"<EOF" dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];
    int counter = 0;
    while (dataReceived == nil && counter < 5) {
        // runLoop is [NSRunLoop currentRunloop]
        [runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.3]];
        ++counter;
    }

    return [dataReceived copy];
}

// call this on the main thread
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
    NSData *data = [self writeData:dataToWrite];
    dispatch_async(dispatch_get_main_queue(), ^{
        // do something with the data on the main thread.
    });
});

-（NSData*）写入数据：（NSData*）数据写入{
dataReceived=nil；//AsyncSocket将数据写入此变量
[asyncSocket writeData:dataToWrite withTimeout:-1标记：0]；
[asyncSocket readDataToData:[@”尝试使用
GCD
（Grand Central Dispatch）在单独的线程上写入数据，然后在写入数据时返回主线程。您可以这样做：

-(NSData *)writeData:(NSData *)dataToWrite {
    dataReceived = nil; // AsyncSocket writes data to this variable
    [asyncSocket writeData:dataToWrite withTimeout:-1 tag:0];
    [asyncSocket readDataToData:[@"<EOF" dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];
    int counter = 0;
    while (dataReceived == nil && counter < 5) {
        // runLoop is [NSRunLoop currentRunloop]
        [runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.3]];
        ++counter;
    }

    return [dataReceived copy];
}

// call this on the main thread
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
    NSData *data = [self writeData:dataToWrite];
    dispatch_async(dispatch_get_main_queue(), ^{
        // do something with the data on the main thread.
    });
});

我希望这样的东西可以帮助您……
为什么您首先想要那个场景？如果您要做的第一件事是阻止它，直到更多或更少的任意未来日期？为什么不使用runloop从线程开始整个过程，并调度结果数据，以便在
NSOperationQueue
或全局并发
调度队列之一上进行处理？