Question

I have a navigation based project and I want to be able to access properties in the different classes of the project.

In my appDelegate I have the property:

UINavigationController *navig;

and then I set the rootViewController:

MainViewController *theMainViewController = [[MainViewController alloc] init];
self.navig = [[UINavigationController alloc] initWithRootViewController:theMainViewController];

In the theMainViewController object I have the property:

MyScrollView *scrollView;

So, to access this scrollView property from a different class, I tried the following:

MyAppDelegate *myAppDelegate = (MyAppDelegate*) [UIApplication sharedApplication].delegate;
UIViewController *mainViewController = [myAppDelegate.navig.viewControllers objectAtIndex:0];
UIScrollView *scroll = mainViewController.scrollView;

However, it is not working. It doesn’t seems to find the scrollView property. Am I doing something wrong? Thanks very much!

Answer 1

How do you decline properties?

Also you should set appropriate type of mainViewController : it should be MainViewController:

MainViewController *mainViewController = [myAppDelegate.navig.viewControllers objectAtIndex:0];