Cocoa WebView滚动条不会消失

我加载了webview并将allowsScrolling设置为NO,但是webview仍然显示滚动条...现在MacBooks有锋利的金属边缘,在你的计算机上敲打你的头很多.

我的代码:

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // Insert code here to initialize your application
    NSString *webFolder = @"file:///";
    [[[productWeb mainFrame] frameView] setAllowsScrolling:NO];
    [productWeb setFrameLoadDelegate:self];
    [[productWeb mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:[webFolder stringByAppendingString:@"webpage.html"]]]];
}

我甚至设置帧加载委托来报告滚动状态:

- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame
{
    NSLog(@"Scrolling %@",[[frame frameView] allowsScrolling] ? @"Allowed" : @"Not Allowed");
    [[frame frameView] setAllowsScrolling:NO];
    NSLog(@"Scrolling %@",[[frame frameView] allowsScrolling] ? @"Allowed" : @"Not Allowed");
}

这仍然让我不快乐:

2010-08-24 15:20:09.102 myApp[30437:a0f] Scrolling Allowed
2010-08-24 15:20:09.104 myApp[30437:a0f] Scrolling Not Allowed

然而滚动条继续显示!希望这是我做的蠢事,因为我不想在我的笔记本电脑上得到更多的血.