stringByEvaluatingJavaScriptFromString Reference Local File

StackOverflow https://stackoverflow.com/questions/9816083

Frage

I have an image that I have in my bundle resources that I need to reference as a source file (src="") in my webView stringByEvaluatingJavaScriptFromString. I can reference external images from websites, but I do not know how to write the URL of the local image.

How could this be done?

War es hilfreich?

Lösung

An example to show how you could do this...

in my viewDidLoad, I am adding some example HTML into a UIWebView as shown below: (This could easily be a loadRequest: call to a remote URL)

NSString *html = @"<html><body><img id='theImage'></img></body></html>";
[self.webView loadHTMLString:html baseURL:nil];

You need to set the view controller as the delegate for the UIWebView, and wait until it has finished loading the HTML. You can then execute a script to amend the image URL:

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    // Get the path to the image in the bundle you wish to display, and create a URL from this path.
    NSString *imagePath = [[NSString alloc] initWithString:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"MyImage.png"]];
    NSURL *imageURL = [NSURL fileURLWithPath:imagePath];
    // Create a script to execute in the web view.
    NSString *script = [[NSString alloc] initWithFormat:@"document.getElementById('theImage').src = \"%@\";", imageURL];
    // Execute the script.
    [self.webView stringByEvaluatingJavaScriptFromString:script];
    // Tidy up.
    [imagePath release];
}
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