Adding multiple navigation controllers inside a view controller? - iphone

Question

I'm trying to acheive a dual-tabBar app for the iPhone and using the following code for a base class view controller to add several navigation controllers inside the view controller (see code below). But the problem is: No subviews are added to self.view, despite them being initialized earlier. Any ideas?
- (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];
}
}
And the code in the subclass:
- (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

I figured it out. I had the following in a view controller I was adding...
- (void)loadView
{
}
, which of course means that the superclass won't be loaded at all. Stupid. Otherwise, this method works quite well. :)