按时从 GCDAsyncSocket 读取响应（iOS）答案

【问题标题】：Reading response from GCDAsyncSocket on time (iOS)按时从 GCDAsyncSocket 读取响应（iOS）
【发布时间】：2012-08-19 00:38:25
【问题描述】：

这个问题很简单，就是不知道怎么处理。

我通过以下方式读取数据：

[asyncSocket readDataWithTimeout:-1 tag:2];

NSString *failure = [serverJSONResponseParsed objectForKey:@"failure"];
NSLog(@"Contents of string failure: %@", failure);

if ([failure isEqualToString:@"none"]) {
    NSLog(@"Success Sending String");
    return TRUE;
}
else {
    NSLog(@"Failure: %@",failure);
    return FALSE;
}

现在，正如预期的那样，我的委托方法被调用并正确读取 JSON 数据：

-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
    NSError *error;
    NSLog(@"didReadData: %@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    serverJSONResponseParsed = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
    NSLog(@"didReadData test after dict: %@", [serverJSONResponseParsed objectForKey:@"failure"]);
}

问题是，由于 GCDAsyncSocket 是异步的，这段代码

NSString *failure = [serverJSONResponseParsed objectForKey:@"failure"];
NSLog(@"Contents of string failure: %@", failure);

if ([failure isEqualToString:@"none"]) {
    NSLog(@"Success Sending String");
    return TRUE;
}
else {
    NSLog(@"Failure: %@",failure);
    return FALSE;
}

之后

[asyncSocket readDataWithTimeout:-1 tag:2];

在数据有机会被读入之前被调用。我将如何确保读取数据，然后对其进行分析。

【问题讨论】：

标签： ios sockets cocoaasyncsocket gcdasyncsocket

【解决方案1】：

该代码块需要在 didReadData 回调方法中，如下所示：

    -(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
        NSError *error;
        NSLog(@"didReadData: %@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
        serverJSONResponseParsed = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
        NSLog(@"didReadData test after dict: %@", [serverJSONResponseParsed objectForKey:@"failure"]);

    NSString *failure = [serverJSONResponseParsed objectForKey:@"failure"];
    NSLog(@"Contents of string failure: %@", failure);

    if ([failure isEqualToString:@"none"]) {
        NSLog(@"Success Sending String");
        return TRUE;
    }
    else {
        NSLog(@"Failure: %@",failure);
        return FALSE;
    }
}

【讨论】：

谢谢。感谢您回答了我几乎所有的问题。