将变量添加到所有UIViewControllers

FooViewController

UIViewController

UINavigationController

rootController

UIViewController

UIViewController

FooViewController

UIViewController

UIViewController

FooViewController

UITableViewController

DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"Nib name" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];

UIViewController

navigationController

UIViewController

@interface FooUIViewController : UIViewController {
    FooViewController *fooViewController;
}

@interface FooUITableViewController : UITableViewController {
    FooViewController *fooViewController;
}

[self.fooViewController pushViewController:detailViewController];