How to send events from HTML running inside a UIWebView to native Objective-C code?

Question

I want to integrate a full HTML framework (ie HTML/CSS/JavaScript) inside an iOS app and make the UIWebView in charge of running the HTML content being able to communicate with

Answer 1

The way you usually talk back from JavaScript is by opening a fictional URL (by window.location), and then implementing UIWebViewDelegate's -webView:shouldStartLoadWithRequest:navigationType: to ignore the navigation and handle what needs to be done instead.

(On Mac OS X WebKit, you can supply Objective-C objects that have JavaScript functions to the web site, but this is not available in iOS.)