Are you using the UIWebView to kust one image?
Which means that you know the URL of that image.
Them you should just download the image via NSURLRequest and save the data, after which you can just display the image in a normal UIImageView.
There a lot tutorials on how to do this, just search for async imageview.
If you want the user to be able to select an image displayed in the webview where there are multiple images. Then you should look at some kind of Javascript method and create a custom URL schema, which you can then pick-up from you code.
Then just the method above to download.
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