Question

I want to set an NSString property of a main view from a nested view. I do so right now by allocating the previous class and accessing the class.property. When I pop the view controller programmatically and NSLog the property from the main view, it’s null.

How does this happen?

EDIT:

MainViewController *controller = [[MainViewController alloc] init];
switch (indexPath.row) {
    case 0:
        controller.category = @"Categorie 1";
        break;
    default:
        break;
} 
[controller release];

Answer 1

You mentioned you are going to pop the viewController so I assume you are trying to set a property of the controller below the navigation stack.

Instead of creating a new object of the class, you should get back the original object that was already created.

NSArray *viewControllers = [self.navigationController viewControllers]; // array of viewControllers currently on the navigation stack.
MainVC *mainVC = (mainVC *)[viewControllers objectAtIndex:viewControllers.count - 2];
[mainVC setProperty:...];