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ScreenShot UIWebView that is not currently displayed on the screen

I am trying to create thumbnails of several pages that will be displayed through UIWebView. The problem is that all the images look gray or the background color that I set for UIWebView. Maybe I do not allow web browsing enough time to load the page?

I believe that I want to do the following:

  • Create a UIWebView that does not appear on the screen
  • Setting the graphics context
  • For each page:
    • Call loadRequest on the web page
    • Display web view in graphical context
    • capture screenshot
  • Final graphic context

Here is the code that I have for one image:

UIWebView *screenWebView = _screenshotWebView;
UIView *screenView = _screenshotView;

if ([UIScreen instancesRespondToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] == 2.0f) {
    UIGraphicsBeginImageContextWithOptions(screenView.bounds.size, NO, 2.0f);
} else {
    UIGraphicsBeginImageContext(screenView.bounds.size);
}

[screenWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:path ofType:@"html"]isDirectory:NO]]];


[screenView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

_screenshotWebView _screenshotView XIB , , , , .

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. , , , - : https://github.com/rmcl/webview_screenshot

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, UIWebView . ; UIWebView, , - , .

webViewDidFinishLoad: .

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