iphone - Three20 的基于 URL 的导航 + 标签栏示例？

Question

我刚刚发现(或者至少应该是)做state persistence with Three20 library是多么容易。但是，我无法弄清楚如何将 URL 映射器与选项卡栏 ( UITabBarController ) 一起使用。

情况是这样的:

1. 我有四个选项卡和不同的 Controller :FirstViewController , SecondViewController , ThirdViewController和FourthViewController .
2. 我想将它们映射到 tt://tabs/first , ..., tt://tabs/fourth分别，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。

到目前为止我的代码:

// 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];

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

Answer 1

所以，我刚刚发现了 TTNavigatorDemo ;-)

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