如何将ViewController推送到tabBarController视图？
我正在尝试显示一个显示 pdf 文件（PDFReaderViewController）的 UIViewController。我有一个有 4 个选项卡的 tabBarController。我想选择第四个选项卡，它是一个带有文件列表的 UITableView，并在顶部显示带有导航栏的 pdf。当用户完成查看 pdf 后，他可以导航回 UITableView（第四个选项卡）。 我能够显示第四个选项卡视图，但无法让它显示 pdf。这是我的代码：
PDFReaderViewController *pdfController = [[PDFReaderViewController alloc] init];
[pdfController initwithName:fileName];
//display the right tab view
UIViewController *currView = [tabBarController.viewControllers objectAtIndex:3];
[tabBarController setSelectedViewController:currView];
[window insertSubview:tabBarController.view atIndex:0];
[[currView navigationController] pushViewController:pdfController animated:YES];///this is not showing!!!!
[currView loadView];
[pdfController release];
[window makeKeyAndVisible];
我在这里做错了什么？感谢您的帮助！
I'm trying to display a UIViewController which displays a pdf file (PDFReaderViewController). I have a tabBarController with 4 tabs. I want to select the 4th tab, which is a UITableView with a list of files, and display the pdf with a navigation bar at the top. When the user is done viewing the pdf he can navigate back to the UITableView (4th tab).
I'm able to display the 4th tab view but I can't get it to display the pdf. Here is my code:
PDFReaderViewController *pdfController = [[PDFReaderViewController alloc] init];
[pdfController initwithName:fileName];
//display the right tab view
UIViewController *currView = [tabBarController.viewControllers objectAtIndex:3];
[tabBarController setSelectedViewController:currView];
[window insertSubview:tabBarController.view atIndex:0];
[[currView navigationController] pushViewController:pdfController animated:YES];///this is not showing!!!!
[currView loadView];
[pdfController release];
[window makeKeyAndVisible];
What am I doing wrong here? Thanks for your help!
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我最好的猜测是 currView 不是导航控制器。
您需要将第四个选项卡设置为导航控制器，其根视图控制器是tableView。我猜测
[currView navigationController]返回 nil。查看此情况的最佳方法是在相关行设置断点，然后打开调试器并键入
po currViewMy best guess is that currView is not a navigation controller.
You need to make the 4th tab be a navigation controller, whose root view controller is the tableView. I'm guessing
[currView navigationController]is returning nil.The best way to see this is to set a breakpoint at the relevant line, then open the debugger and type
po currView