Navigate a WebView

With a webview is it possible to set up a simple 'Back' button (either in a navigation bar or a top toolbar) that doesn't show the back button on the first URL of the WebView - and only appearing on a second URL to get back to the first?

Unless I'm getting getting this wrong, in a lot of hybrid native/web apps such as News apps, you often see news articles in a table (HTML page rather than a 'programmed in xcode' table) which hyperlink to article detail pages (开发者_运维百科again, HTML rather than natively coded) - what I can't figure, is how the detail page (2nd URL in webview) displays with a 'back button' but the table (1st URL in webview) doesn't have the button showing in these type of apps?

Currently, I have a webview as described, with a 'back' bar button item in a toolbar at the top of screen (outlet as 'cangoback' for WebView) but the button is visible when there's no page to 'go back' to -

What I've got simply is:

Webview - 1st URL, HTML table - 'back' button shows, but isn't active (of course)

Webview - 2nd URL, HTML detail page - 'back' button shows, and can go back.

How do you get it to only appear on 2nd URL, or be HIDDEN on 1st URL?

Regards Randy

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You can play with the Navigation Bar's visibility. Implement this:

[self.navigationController setNavigationBarHidden:YES animated:YES];