iOS: Delegates

it works like an interface
Example:

@interface myVC:UIViewController <UIWebViewDelegate>
{
}
@end

// assume webViewToLoad IBOutlet
[webViewToLoad setDelegate:self];

// implement methods of delegate
-void webViewDidStartLoad: (UIWebView *) webview
{
  NSLog(@"started loading...");
}

-void webViewDidFinishLoad: (UIWebView *) webview

{

  NSLog(@"finished loading...");

}