Consider a class with these methods:

- (id) initWithFrame: (CGRect) frame
{
    if (!(self = [super init]))
        return nil;
    webView = [[UIWebView alloc] initWithFrame:frame];
    [webView setDelegate:self];
    lock = [[NSConditionLock alloc] initWithCondition:LOCK_WAIT];
    return self;
}

- (void) setHTML: (NSString *) html
{
    [lock lockWhenCondition:LOCK_WAIT];
    [webView loadHTMLString:html baseURL:nil];
    [lock unlock];
}

- (void)webViewDidFinishLoad:(UIWebView *)aWebView
{
    [lock lockWhenCondition:LOCK_WAIT];
    // Locking to be able to unlock and change the  condition.
    [lock unlockWithCondition:LOCK_GO];
}

- (NSString *) stringByEvaluatingJavaScriptFromString: (NSString *) jsCommand
{
    [lock lockWhenCondition:LOCK_GO];
    return [webView stringByEvaluatingJavaScriptFromString:jsCommand];
    [lock unlock];
}

Let's call this class SynchronousUIWebView. From the main thread I execute:

webView = [[SynchronousUIWebView alloc] initWithFrame:frame];
[webView setHTML:html];
[webView stringByEvaluatingJavaScriptFromString:jsCommand];

The problem seems to be that the delegate is not called until I leave the current call stack, which I don't since I'm waiting for the delegate call to happen, aka deadlock. To me it seems like the delegate call is pushed to a queue that is called when the current call is done. So the question is can I modify this behavior?

Note: The reason this is needed is that I can't execute the JavaScript until the HTML has loaded.