Forward and back native buttons in UIWebview iphone

Inside the Twitter iPhone app, if you click on a link it pushes in a WebView.

Ive gotten this far, but I can't find the correct identifier for the forward and backward buttons like at the bottom left of the image below. Are they na开发者_JS百科tive? or are they just images they have created themselves?

You might want to have a look at a drop-in inline web view controller I did: SVWebViewController. It should save you a fair bit of coding :)

Per the list of UIBarButtonItems from the docs, those items you desire need to be custom images a they are not provided in the current SDK.