Question

my app is built with a UITabController and works as imagined. However, for one of the views within my UITabBar, I would like to add a table that when something is pressed will take me somewhere. And I would like to do this just within this one view.

I know how to build a table and populate and get it to go somewhere but my issue is I can’t seem to get my app to run with the table. I feel like my connections are off and specifically with appDelegates. I already had two appDelegate files (.h & .m) before adding the UINavigationController so from here I really don’t know what to do. I took apple’s simpleTableView tutorial files and copied them over to mine. It still crashes. I even copied there appDelegate files (so now I have 4) but the same deal. This is the error I am getting but in general I just feel lost with the delegates and connections.

2011-12-12 12:08:50.302 TabbedCalculation[68713:207] * Terminating app due to uncaught exception ‘NSUnknownKeyException’, reason: ‘[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key delegate.’
* Call stack at first throw:

If anyone can offer any help, it would be much appreciated.

Thanks!

P.S. I have changed within the mainWindow.xib of the UITabController to point one of the tabs to the appropriate class and xib file so that is not the issue but I have noticed that many tutorials want within the app delegate this line to the navController:
[window addSubview:[navigationController view]];

but I have already set it to the tabBarController.

Answer 1

Your app can only use one set of app delegate files. So copying over a the example’s app delegate files does not mean they are being utilized. You need a navigation controller inside the specific tab you want to contain the tableview. Here is an example of a navigation controller inside a tab bar controller, by modifying didFinishLaunchingWithOptions in the app delegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.

    AllTaskViewController *view1 = [[AllTaskViewController alloc] initWithNibName:@"AllTaskView" bundle:nil];
    view1.title = @"All Tasks";

    TodayTaskViewController *view2 = [[TodayTaskViewController alloc] initWithNibName:@"TodayTaskView" bundle:nil];
    view2.title = @"Today's Tasks";

    HistoryViewController *view3 = [[HistoryViewController alloc] initWithNibName:@"HistoryView" bundle:nil];
    view3.title = @"History";

    SettingsTableViewController *view4 = [[SettingsTableViewController alloc] initWithNibName:@"SettingsTableView" bundle:nil];
    view4.title = @"Settings";

    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:view1];
    UINavigationController *nav2 = [[UINavigationController alloc] initWithRootViewController:view2];
    UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:view3];
    UINavigationController *nav4 = [[UINavigationController alloc] initWithRootViewController:view4];

    [view1 release];
    [view2 release];
    [view3 release];
    [view4 release];

    self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:nav1, nav2, nav3, nav4, nil];

    [nav1 release];
    [nav2 release];
    [nav3 release];
    [nav4 release];

    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];    

    return YES;
}

Note: All 4 view controllers have an individual navigation controller, and each one is a custom view controller. I used nibs here, but you don’t necessarily have to. And the app itself has no main window, you would need to modify this slightly if you are using a main window for the app.