Question

I have a WebView that is loading a webpage. I want to save all the images loaded in the webpage, but I want to save them as each image is finished downloading through the delegate method:

-(void) webView:(WebView *)sender resource:(id)identifier didFinishLoadingFromDataSource:(WebDataSource *)dataSource

How would I do this? I just want to avoid the situation where I grab the image src’s and then redownload the images. Maybe my approach is wrong? Maybe save the images through [NSURLCache sharedURLCache]? Any help is greatly appreciated! Thanks!

Answer 1

This SO answer helped out a lot in giving me some breakthroughs for my final solution. I ended up executing some javascript to grab the src attribute from the img tag. Then, every time the -(void) webView:(WebView *)sender resource:(id)identifier didFinishLoadingFromDataSource:(WebDataSource *)dataSource method is called, it checks for [dataSource subresourceForURL:url]. If it returns true, then it performs the save. Here’s the full code:

-(void) webView:(WebView *)sender resource:(id)identifier didFinishLoadingFromDataSource:(WebDataSource *)dataSource {
    NSURL *url = [NSURL URLWithString:[[webView windowScriptObject] evaluateWebScript:/* javascript to grab src */]];
    if ([dataSource subresourceForURL:url]) {
        NSData *dataToSave = [[dataSource subresourceForURL:url] data];
    }
}

Hope this helps someone!