Further develop an existing iPhone App ( UIWebView based ) with the following features.
1. Build a simple menu bar in xcode that can navigate backwards in the UIWebView as well as toggle an html menu within the UIWebView.
2. Allow the user to click a link that opens an address in the apple maps app without navigating out of my app.
3. Enable the activityIndicator when the UIWebView is loading pages.
Please see attached screenshots.