ParentViewController is zero no matter what I do

Question

My hierachy controller:

• TabBaseController (UITabBarController)
  • Subclassedcontroller

In my tabbasecontroller, I have a navigation bar button that flips the subclass controller using the presentModalViewController method to the second UITabBarController.

So my question is: why not

self.parentViewController

work in the second UITabBarController? This is zero.

I try this in my viewDidLoad method in the second UITabBarController:

if (self.parentViewController == nil) {
   NSLog(@"Parent is nil");
}

UPDATED

This is a method in a UITabBarController with a navigation item that represents it

-(IBAction)openModalTabController:(id)sender {  

if (self.nvc == nil) {
    ModalTabController *vc = [[ModalTabController alloc] init]; 
    self.nvc = vc;
    [vc release];
}

[self presentModalViewController:self.nvc animated:YES];
}

This is the controller (UITabBarController) that I present modally:

Title:

@interface NewBuildingViewController : UITabBarController {
}
@end

Main:

@implementation NewBuildingViewController

- (id)init {
[super initWithNibName:nil bundle:nil];

ViewController1 *vc1 = [[ViewController1 alloc] init];
ViewController2 *vc2 = [[ViewController2 alloc] init];
ViewController3 *vc3 = [[ViewController3 alloc] init];

NSArray *controllers = [[NSArray alloc] initWithObjects:vc1, vc2, vc3, nil];

[vc1 release];
[vc2 release];
[vc3 release];

self.viewControllers = controllers;
[controllers release];

self.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;

return self;
}

 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
return [self init];
}

@end

I also want to add that this message is displayed in the console (warning) when flipping:

​​ . , . ​​ ,

Answer 1

, , UITabBarController. , , UITabBarController?

. .