Javascript in UIWebView callback to C/Objective-C

Question

Is there a way to get a callback to objective-c when a certain event has been detected in a UIWebView? Can Javascript send a callback to Objective-C?

Answer 1

Just to illustrate the solution by "bpapa" with actual code:

WARNING: untested code

Implement this method in the UIWebView's delegate...

-(BOOL) webView:(UIWebView *)inWeb shouldStartLoadWithRequest:(NSURLRequest *)inRequest navigationType:(UIWebViewNavigationType)inType {
    if ( [[[inRequest URL] scheme] isEqualToString:@"callback"] ) {

        // Do something interesting...

        return NO;
    }

    return YES;
}

...then put a link in the webwieb like this:

Click me

And it should activate your callback-code. Obviously, you could trigger it with a javascript instead of a plain link.