Three20的基于URL的导航+标签栏示例？

Question

我刚刚发现使用Three20库进行状态持久化是多么容易(或者至少应该是这样).但是,我无法弄清楚如何使用带有标签栏(UITabBarController)的URL映射器.

情况是这样的:

1. 我有四个标签和不同的控制器为他们:FirstViewController,SecondViewController,ThirdViewController和FourthViewController.
2. 我想分别将它们映射到tt://tabs/first...,tt://tabs/fourth并在应用程序关闭时将它们保存在某处,以便在应用程序再次启动时自动打开以前查看的选项卡.

我的代码到目前为止:

// 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];

如何TTNavigator打开最后打开的选项卡,如果没有,则回退到FirstViewController？

Answer 1

所以,我刚刚发现了一下TTNavigatorDemo;-)

更新:还写了一个教程,请http://three20.pypt.lt/url-based-navigation-and-state-persistence