Question

Here’s my code:

- (IBAction)play {
    if (!self.mapViewController)
    {
        self.mapViewController = [[MapViewController alloc]initWithNibName:@"MapViewController" bundle:nil];
    }
    [self.navigationController pushViewController:mapViewController animated:YES];
}

What happen is: when I pressed the play button for the first time, new view doesn’t show up. When I pressed again, it crashes because the same UIViewController have been added into the stack more than once. Does anyone know how to fix this?

Edit:
Thank you for all of your answers. I checked the xib and I’ve found that I messed up the links. Fixed it 🙂

Answer 1

Ok try this below code this is worked for me:
if current viewcontroller is not uinavigation controller try this code:

- (IBAction)play {
   MapViewController *mapView = [[MapViewController alloc]initWithNibName:@"MapViewController"    bundle:nil];
   UINavigationController *navController = [[UINavigationController alloc]  initWithRootViewController:mapView];
   [self presentModalViewController:navController animated:YES];
}

(or) if currentviewcontroller is uinavigation controller try below code:

  - (IBAction)play {
    MapViewController *mapView = [[MapViewController alloc]initWithNibName:@"MapViewController"    bundle:nil];//Note:Check the mpviewcontroller xib file name as MapViewController is correct
    [self.navigationController pushViewController:mapViewController animated:YES];
   }

Thanks..!