I have a webview in my iPhone application, and I also have some html files inside my Resources folder. When my app loads, I load in a page from my resources into my webview.
This code would return a string with the URL of a file named "OtherPage.html" in your bundle's resources directory.
[[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"OtherPage" ofType:@"html"]] absoluteString]