Question

I am able to pass a variable forward from view controller to view controller by pushing its view controller onto the navigation stack. An example of how I do it would be this:

MyViewController *controller = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];
controller.myString = stringToPass;
[self.navigationController pushViewController:controller animated:YES];
[controller release];

However, what do I do if I want to pass a variable BACK UP the navigation stack? Using popViewControllerAnimated rather than pushViewController does not pass the variable up like I thought it would.

I need to be able to access the variable several pops up from the view controller it is defined in.

Any help will be greatly appreciated 🙂

Answer 1

You’re passing values, not variables.

A view controller should not be responsible for popping itself. With Apple’s view controllers (e.g. UIImagePicker), it is the parent view controller’s responsibility to do the popping; the parent VC can also obtain the current value. (Not entirely correct; it might access the value before a keyboard autocompletion is applied)

Alternatively, if it’s a value that can be shared globally, you can store it in your application delegate.