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我刚刚发现使用 Three20 library进行状态持久化是多么容易(或者至少应该如此)。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. 我有四个选项卡和不同的控制器:FirstViewControllerSecondViewController和。ThirdViewControllerFourthViewController
  2. 我想将它们分别映射到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先前查看的选项卡。

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

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1 回答 1

6

所以,我刚刚发现TTNavigatorDemo;-)

更新:还写了教程,见http://three20.pypt.lt/url-based-navigation-and-state-persistence

于 2010-02-24T00:24:45.530 回答