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POThree20's URL-based navigation + tab bar example?
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copied!<p>I just found out how easy it is (or at least is supposed to be) to do <a href="http://three20.info/ui/navigation" rel="nofollow noreferrer">state persistence with Three20 library</a>. However, I am unable to figure out how to use the URL mapper with a tab bar (<code>UITabBarController</code>).</p> <p>The situation is this:</p> <ol> <li>I have four tabs and different controllers for them: <code>FirstViewController</code>, <code>SecondViewController</code>, <code>ThirdViewController</code> and <code>FourthViewController</code>.</li> <li>I want to map those to <code>tt://tabs/first</code>, ..., <code>tt://tabs/fourth</code> respectively, and have them saved somewhere when application closes so that the previously viewed tab is automatically opened when the application starts again.</li> </ol> <p>My code so far:</p> <pre><code>// Init the tab bar tabBarController = [[UITabBarController alloc] init]; [tabBarController setDelegate:self]; // Init the navigator TTNavigator *navigator = [TTNavigator navigator]; [navigator setWindow:window]; [navigator setPersistenceMode:TTNavigatorPersistenceModeAll]; // Begin mapping TTURLMap *map = [navigator URLMap]; [map from:@"tt://tabs" toViewController:[UIViewController class]]; [map from:@"tt://tabs/first" toViewController:[FirstViewController class]]; [map from:@"tt://tabs/second" toViewController:[SecondViewController class]]; [map from:@"tt://tabs/third" toViewController:[ThirdViewController class]]; [map from:@"tt://tabs/fourth" toViewController:[FourthViewController class]]; // Try restoring if (! [navigator restoreViewControllers]) { // Open default TTURLAction *defaultAction = [[TTURLAction alloc] initWithURLPath:@"tt://tabs/default"]; [defaultAction setParentURLPath:@"tt://tabs"]; [navigator openURLAction:defaultAction]; } // Put view controllers to tab bar [tabBarController setViewControllers:[NSArray arrayWithObjects: [[FirstViewController alloc] init], [[SecondViewController alloc] init], [[ThirdViewController alloc] init], [[FourthViewController alloc] init], nil]]; [window addSubview:tabBarController.view]; [window makeKeyAndVisible]; </code></pre> <p>How do I get <code>TTNavigator</code> to open the last opened tab, and if there's none - fallback to <code>FirstViewController</code>?</p>

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