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POMaking a 'hole' in a UITabBarController or UINavigationController?
 

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    <p>How would I 'punch a hole' in a tab bar app, whereby a tab-bar based app can show a view behind the uinavigationcontrollers that are in each tab? (this punch could be optionally turned off). </p> <p>My code, the the app delegate, for creating the tabs is:</p> <pre><code>OneRootViewController *oneRootViewController = [[OneRootViewController alloc] initWithNibName:@"OneRootViewController" bundle:nil]; UINavigationController *oneNav = [[UINavigationController alloc] initWithRootViewController:oneRootViewController]; oneNav.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"One" image:[UIImage imageNamed:@"one.png"] tag:0]; TwoRootViewController *twoRootViewController = [[TwoRootViewController alloc] initWithNibName:@"TwoRootViewController" bundle:nil]; UINavigationController *twoNav = [[UINavigationController alloc] initWithRootViewController:twoRootViewController]; twoNav.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Two" image:[UIImage imageNamed:@"two.png"] tag:1]; self.tabBarController = [[UITabBarController alloc] init]; self.tabBarController.viewControllers = [NSArray arrayWithObjects:oneNav, twoNav, nil]; self.window.rootViewController = self.tabBarController; [self.window makeKeyAndVisible]; </code></pre> <p>Here's how I'd like it to work:</p> <pre><code>----------------------------- | | | --------------- | | | | | | | hole which | | | | shows the | | | | same view | | | | in each tab | | | --------------- | | | | | ----------------------------- | | | | tab 1 | tab 2 | | | | ----------------------------- </code></pre> <p>There's a thread here about transparent rectangles - <a href="https://stackoverflow.com/questions/3800278/iphone-draw-transparent-rectangle-on-uiview-to-reveal-view-beneath">iPhone - Draw transparent rectangle on UIView to reveal view beneath</a> - but I'm not sure how to do it in my case.. would I subclass my nav controller or tab bar controller (is it legal to even do that), and if so, how would I make the hole optional?</p>
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    1. COyou neet to remeber that computers don't think of holes, they cna only think of full objects, so maybe you would like to use layers?
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