UINavigationController 推 UITabBarController 只显示一个选项卡
我有一个应用程序，它在 IB 中创建了一个 UITabBarController 。该 tbc 加载了 3 个视图，到目前为止工作正常。
我决定插入 UINavController 作为起始 VC，并让 UITableViewController 在单元格中显示 4 个菜单项。这 4 个项目中的每一个本质上都会加载 UITabBarController 将传递放入不同的 xml 文件中进行处理，以便在这 3 个选项卡中显示数据。
我基本上是在 applicationDidFinishLoading 结束时执行此操作：
MainMenu *rootViewController = [[MainMenu alloc] init];
navController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
self.window.rootViewController = navController;
[window makeKeyAndVisible];
return YES;
然后我创建了 MainMenu 作为 rootViewController 子类 UITableViewController 并添加了一个硬编码数组，其中显示我想要的 4 件商品。我让 didSelectRowAtIndexPath 运行此代码：
tabBarController = [[UITabBarController alloc] init];
[self.navigationController pushViewController:tabBarController animated:YES];
[tabBarController release];
事实证明，当我运行它时，导航控制器会推送选项卡控制器，但只显示第一个选项卡。这是一张照片。
I have an application that has a UITabBarController created in IB. That tbc loads 3 views which work fine up to now.
I decided to INSERT a UINavController as the starting VC and have a UITableViewController display 4 menu items in cells. Each of the 4 items will in essence load the UITabBarController put pass in a different xml file to process in order to display data in those 3 tabs.
I essentially did this at the end of the applicationDidFinishLoading:
MainMenu *rootViewController = [[MainMenu alloc] init];
navController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
self.window.rootViewController = navController;
[window makeKeyAndVisible];
return YES;
I then created the MainMenu as the rootViewController subclassing UITableViewController and added a hardcoded array for now which displays the 4 items I want. I had the didSelectRowAtIndexPath run this code:
tabBarController = [[UITabBarController alloc] init];
[self.navigationController pushViewController:tabBarController animated:YES];
[tabBarController release];
It turns out that when I run it, the navcontroller pushes the tab controller but only the first tab shows up. Here is a pic.
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您永远不应该从
UINavigationController推送UITabBarController。苹果明确表示：使用标签栏控制器的应用程序也可以在一个或多个标签中使用导航控制器。当在同一个用户界面中组合这两种类型的视图控制器时，标签栏控制器始终充当导航控制器的包装器。`
这本质上意味着标签栏应该是所有其他被调用的视图控制器。反之则不然。您可能应该改变展示应用程序的方式。
更多信息请参见此处。
You should never push a
UITabBarControllerfrom aUINavigationController. Apple clearly says this:An app that uses a tab bar controller can also use navigation controllers in one or more tabs. When combining these two types of view controller in the same user interface, the tab bar controller always acts as the wrapper for the navigation controllers.`
That essentially means tab bar should be the parent of all other view controllers that get called. Not the other way round. You should probably change the way you present your app.
More information here.