在触摸移动之前，UIWebView不会显示

Question

我在uiview中有三个webview，只显示了一个。有时当我将网址加载到未显示的网页视图，然后将它们移动到框架中心时，它们只显示白框 - 只有白色屏幕，即使他们一直说他们已完成加载。所以... 加载后是否有可能强制重绘？当我随机滚动它们时，鼓励webviews显示它们的内容...... 还有其他想法来修复这个bug吗？

代码：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
 return YES;
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {

    Boolean end = true;
    for (int i = 0 ; i < 3 ; i ++)
    {
        if ( mainWebViews[i].isLoading ) 
        {
            end = false;
        }

    }
    if (end)
    {
        //NSLog(@"nothing is loading?");

        [loader stopAnimating];
        loader.hidden = YES; 
    }

    webView.hidden = NO;
     // how to redraw here? 
}

- (void)webViewDidStartLoad:(UIWebView *)webView { 


    //NSLog(@"start loading");
    webView.hidden = YES; 
    loader.hidden = NO;
    [loader startAnimating];

}

-(void)webView:(UIWebView*) wv didFailLoadWithError: (NSError*) error
{
    // some stupid -999 error
    if ( [error code] != NSURLErrorCancelled )
    {
        NSLog(@"error");
        NSLog( [error localizedDescription ]);
    }


}

-(void)loadToWebView:(UIWebView*)wv string:(NSString*)url
{
    if (wv == nil)
        return; 

    [wv loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]]];



}