Question

When I try to push a UIViewController subclass (MissionViewController) onto a UINavigationController from within my root view controller, the viewDidLoad method is only called if I reference the underlying view after initializing the view controller. However, even with the method called, the screen is not updated.

Both the view controller and the navigation controller are not nil. The file owner in MissionView.xib is set to MissionViewController. The view property of the file owner points to the nib view. I’ve verified that the topViewController property of the navigation controller points to the MissionViewController object.

If I change MissionViewController to be the root view controller, the view loads fine. Saw several similar posts but still having problems.

rootViewController.h

@interface TreeGraphController : UIViewController 
{
    MissionViewController *missionViewCtrlr;
}
@property(nonatomic, retain) MissionViewController *missionViewCtrlr;

rootViewController.m

#import "MissionViewController.h"
...
if (!missionViewCtrlr)
{
    MissionViewController *ctrlr = [[MissionViewController alloc] initWithNibName:@"MissionView" bundle:nil];
    ctrlr.view.hidden = NO;
    self.missionViewCtrlr = ctrlr;
    [ctrlr release];
}

myAppDelegate *del = [[UIApplication sharedApplication] delegate];
[del.navigationController pushViewController:missionViewCtrlr animated:NO];

Answer 1

What about using

[self.navigationController pushViewController:missionViewCtrlr];

in the rootViewController? I assume rootViewController has been pushed to a UINavigationController and that the navigation controller’s view was added as a subview of self.window in the app delegate?

Btw, you may simplify part of your code by just saying

if(!missionViewCtrlr)
  self.missionViewCtrlr = [[MisionViewController alloc] init...];