[iPhone] How to determine if the user had clicked on a UIWebView

Question

I need to get the url that a UIWebView is displaying after the user clicks on it once.

I've tried putting a button which calls a method which determines the url, under the UIWebView, but this way the button doesn't work. I've tried putting a button over a UIWebView but this way it gives not the url after the click, but the starting url.

Can you help me, please?

Thanks in advance!