Accessing UIWebView local storage data from native iPhone app

Question

I'm writing a native iPhone app that contains a UIWebView component. This component accesses an internet webapp and the webapp stores data offline using HTML5 local storage.

Is it possible to access this local storage data from the native app ?

Answer 1

I was looking to do something similar to this. In short, the DOM and all elements are not directly accessible. However, you can hack things up to get at the data. What you have to do is inject your own javascript into the downloaded webpage. Then evaluate the results.

This page shows the mechanism for doing it:

http://iphoneincubator.com/blog/windows-views/how-to-inject-javascript-functions-into-a-uiwebview

Then you just need to know the name of the database and create some javascript to return the values in a JSON string. Use a cocoa JSON parser to create objects from that string that you can use in your native app.