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POGenerating thumbnails of local webpages on iOS
 

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  1. POGenerating thumbnails of local webpages on iOS
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    <p>I have a set of local HTML pages that I would like batch generate thumbnails for on the fly (I only want to show the thumbnails, not the full web pages). This is the way I'm accomplishing this:</p> <pre><code>NSString* path = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:link]; NSURL* url = [NSURL fileURLWithPath:path]; NSURLRequest* request = [NSURLRequest requestWithURL:url]; UIWebView* webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 725, 1004)]; webView.delegate = cell; [webView loadRequest:request]; [self.view addSubview:webView]; // doesn't work without this line, but then the UIWebView is onscreen </code></pre> <p>Then in the delegate:</p> <pre><code>- (void)webViewDidFinishLoad:(UIWebView *)webView { [self performSelector: @selector(render:) withObject: webView afterDelay: 0.01f]; } - (void) render: (id) obj { UIWebView* webView = (UIWebView*) obj; CGSize thumbsize = CGSizeMake(96,72); UIGraphicsBeginImageContext(thumbsize); CGContextRef context = UIGraphicsGetCurrentContext(); CGFloat scalingFactor = thumbsize.width/webView.frame.size.width; CGContextScaleCTM(context, scalingFactor,scalingFactor); [webView.layer renderInContext: context]; UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); self.thumbnail.image = resultImage; } </code></pre> <p>Here are my questions:</p> <p>1) Is my general approach correct? Is this the most efficient way to batch process thumbnails of webpages on the fly?</p> <p>2) I want to be able to render the thumbnail from an offscreen UIWebView, but the webViewDidFinishLoad: doesn't get called unless I add the UIWebView to the view hierarchy. Is there a way I can avoid this?</p> <p>3) If I attempt to capture an image of the UIWebView in webViewDidFinishLoad:, I get a blank image. I have to put an artificial delay for the capture to work. Any way around this?</p> <p>Thanks!</p>
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