Iphone: Problem with moving back and forth between two UIViewController

Question

Let me first describe the context of the problem. I have 2 UIViewController call AdminViewController and ButtonReorderViewController. AdminViewController contain 1 button. ButtonReorderViewController contains 1 button and 1 picture. Button in AdminViewController tie to an event call goToReorderButton. The content of goToReorderButton are below:

ButtonReorderViewController *buttonReorder = [[ButtonReorderViewController alloc] initWithNibName:@"ButtonReorderViewController" bundle:[NSBundle mainBundle]];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:buttonReorder];  //Add a Navigation Controller to the root view
[navController setNavigationBarHidden:TRUE];
buttonReorder = (ButtonReorderViewController *) navController;
[[buttonReorder view] setFrame:CGRectMake(0, -20, 320, 470)];
[self.view addSubview:buttonReorder.view];

I use UINavigationController to allow me to swipe left and right.So I am in AdminViewController, and I click on goToReorderButton, it load ButtonReorderViewController. I am able to swipe left and right (awesome !!!) So I click the button in ButtonReorderViewController call goToAdmin, simply to go back to the AdminViewController

-(void) goToAdmin{
     [self.view removeFromSuperview];
}

However, as soon as I go back to AdminViewController, I cant click anything at all. The program does not seg fault, it just that I cant click the button at all. if I remove the line buttonReorder = (ButtonReorderViewController *) navController; inside goToReorderButton, then everything work fine. Any idea how to fix this?

Answer 1

I am not sure but i think you can use PusViewController method of NavigationController to do your job.

Answer 2

Sounds like the app crashed on that line you pointed out. Does the debug console output anything when it crashes?

Looks like the line buttonReorder = (ButtonReorderViewController *) navController; is failing on the cast. Are you sure ButtonReorderViewController extends UINavigationController? If not, then you can't cast it like that.

Answer 3

I'm not sure that I follow you, but I think that you should use the UINavigationController methods to navigate between the view controllers:

The admin view controller should be the root view controller of the navigation controller and then you may push and pop the reorder view controller.

In app delegate (applicationDidFinishLaunching: method):

// TODO: Instantiate the adminController

UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:adminController];
[window addSubview:navController.view];

In AdminViewController (button touch up inside event handler method):

// TODO: Instantiate the buttonReorder

[self.navigationController pushViewController:buttonReorder animated:YES];

In ButtonReorderViewController (back button touch up inside event handler method):

[self.navigationController popViewControllerAnimated:YES];

Of course, you have to instantiate the view controllers before using them...

Cheers,
Michael.