在視圖控制器中添加多個導航控制器？

Question

我正在嘗試實現適用於iPhone的dual-tabBar應用程序，並將以下代碼用於基類視圖控制器，以在視圖控制器內部添加多個導航控制器（請參見下面的代碼）。 但是問題是：盡管子視圖已經初始化過，但沒有將子視圖添加到self.view中。 有任何想法嗎？

- (IBAction)ViewButtonPressed:(id)sender
{
    UIButton *b = (UIButton *)sender;
    int index = b.tag - 1000;
    [self SelectNavigationController:index];
}

- (void)SelectNavigationController:(int)index
{
    // Set index to top-most view ->
    UINavigationController *nc = (UINavigationController *)[navigationControllers objectAtIndex:index];
    [self.view bringSubviewToFront:nc.view];
}

#pragma mark -
#pragma mark display

- (void)Display
{
    CGRect frame = CGRectMake(0, 44, 320, 367);

    // Create buttons above frame and show navigation controller inside frame ->

    UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.origin.y)];

    for (int i=0; i<[navigationControllers count]; ++i)
    {
        UINavigationController *nc = (UINavigationController *)[navigationControllers objectAtIndex:i];
        UIViewController *vc = [nc.viewControllers objectAtIndex:0];
        NSString *titel = vc.navigationItem.title;

        UIButton *b = [UIButton buttonWithType:UIButtonTypeCustom];
        [b setBackgroundColor:[UIColor lightGrayColor]]; // TODO: Replace with image <-
        [b setTitle:titel forState:UIControlStateNormal];
        b.tag = i + 1000;
        [b setFrame:CGRectMake(i * frame.size.width / 3, 0, frame.size.width / 3, frame.origin.y - 1)];
        [v addSubview:b];
    }

    for (int j=0; j<[navigationControllers count]; ++j)
    {
        UINavigationController *nc = (UINavigationController *)[navigationControllers objectAtIndex:j];
        [nc.navigationBar addSubview:v];
        [self.view addSubview:nc.view]; // Add view to view <-
        nc.view.frame = frame;
    }

    [v release];

    if (VIEW_DEBUG)
        NSLog(@"BaseTabViewController.m: self.view.subviews: %d", [self.view.subviews count]);
}

#pragma mark -
#pragma mark addviewcontroller

- (void)AddViewControllerForNavigationController:(UIViewController *)viewController
{
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewController];
    navController.view.backgroundColor = [UIColor greenColor];
    [navigationControllers addObject:navController];
    [navController release];
}

#pragma mark -
#pragma mark init, loadView, viewDidLoad and dealloc

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder])
    {
        navigationControllers = [[NSMutableArray alloc] init];
    }
    return self;
}

- (void)loadView
{
    //
}

- (void)viewDidLoad
{
    if (!viewDidLoadAlready)
    {
        [self Display];
        viewDidLoadAlready = YES;
        [super viewDidLoad];
    }
}

子類中的代碼：

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder])
    {
        PistKartaViewController *pistKarta = [[PistKartaViewController alloc] init];
        pistKarta.navigationItem.title = @"Pistkarta";
        LiftRapportViewController *liftRapport = [[LiftRapportViewController alloc] init];
        liftRapport.navigationItem.title = @"Liftrapport";
        SkipassViewController *skiPass = [[SkipassViewController alloc] init];
        skiPass.navigationItem.title = @"Skipass";

        [self AddViewControllerForNavigationController:pistKarta];
        [self AddViewControllerForNavigationController:liftRapport];
        [self AddViewControllerForNavigationController:skiPass];

        [pistKarta release];
        [liftRapport release];
        [skiPass release];
    }
    return self;
}

Answer 1

我想到了。 我在要添加的視圖控制器中具有以下內容...

- (void)loadView
{

}

，這當然意味着根本不會加載超類。 笨。 否則，此方法效果很好。 :)