presentModalViewController doesn't work on app launch

[SoulRed12]

I want a modal view controller to be "preloaded" and displaying onscreen when the app starts, so I can have the company logo showing up and then slide offscreen (the disappearing animation of the "cover vertical" transition) after 2 seconds. So, I have the launch image set to the company logo graphic (fills the entire iPad screen), and I am trying to get it so that when the launch image disappears, there's another copy of the image behind it as a modal view controller.

But for some reason, unless I put the call to presentModalViewController in viewDidAppear, the method just doesn't do anything. Here's my code:

(IntroSplashViewController has a view with a single image view, the company logo)

        IntroSplashViewController *isvc = [[IntroSplashViewController alloc] init];
        [isvc setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
        [self presentModalViewController:isvc animated:NO];
        [isvc release];
        
        NSLog(@"Modal View Controller: %@ isvc: %@",self.modalViewController,isvc);
        
        [NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector:@selector(dismissSplashScreen) userInfo:nil repeats:NO];

dismissSplashScreen just has dismissModalViewController in it.

When placed in any method aside from viewDidAppear, the NSLog logs:

Modal View Controller: (null) isvc: <IntroSplashViewController: 0x151a90>

If I do put it in viewDidAppear, I see the main part of the app for a second before the splash screen (modal view controller) pops up...help?

[Duncan C]

Originally Posted by SoulRed12

I want a modal view controller to be "preloaded" and displaying onscreen when the app starts, so I can have the company logo showing up and then slide offscreen (the disappearing animation of the "cover vertical" transition) after 2 seconds. So, I have the launch image set to the company logo graphic (fills the entire iPad screen), and I am trying to get it so that when the launch image disappears, there's another copy of the image behind it as a modal view controller.

But for some reason, unless I put the call to presentModalViewController in viewDidAppear, the method just doesn't do anything. Here's my code:

(IntroSplashViewController has a view with a single image view, the company logo)

        IntroSplashViewController *isvc = [[IntroSplashViewController alloc] init];
        [isvc setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
        [self presentModalViewController:isvc animated:NO];
        [isvc release];
        
        NSLog(@"Modal View Controller: %@ isvc: %@",self.modalViewController,isvc);
        
        [NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector:@selector(dismissSplashScreen) userInfo:nil repeats:NO];

dismissSplashScreen just has dismissModalViewController in it.

When placed in any method aside from viewDidAppear, the NSLog logs:



If I do put it in viewDidAppear, I see the main part of the app for a second before the splash screen (modal view controller) pops up...help?

The method presentModalViewController presents a modal view controller on top of the current view controller. If the current view controller isn't set up yet, it doesn't work.

What we've done is to add a view on top of the app's first view controller that completely covers the screen. Make it a UIImageView, and install the image you want into it. You can even use your default.png file, to make the splash screen last a little longer (don't overdo it, though. Apple will reject your app for displaying a splash screen for too long.)

Then in your root view controller's viewDidLoad method, use animateWithDuration:delayptions:animations:compl etion: to animate away your view. Something like this:

- (void)viewDidLoad
{
  //Add an instance variable "splashAlreadyHidden" to your view controller, so you only animate the splash
  //screen once on first launch.
  if (splashAlreadyHidden)
    return;
  splashAlreadyHidden = TRUE;
  __block CGFloat shift;
  
  splashView.hidden = FALSE;

  [UIView animateWithDuration: .24
    delay: 2.0 
    options: 0
    animations: ^{
      CGPoint splashCenter;
      splashCenter = splashView.center;
      //Shift the splash view off-screen upwards (use += to shift it down, or adjust the x coord
      //to shift it to the side...
      shift = [UIApplication sharedApplication].keyWindow.bounds.size.height
      splashCenter.y -= shift;
      splashView.center = splashCenter;
    }
    completion: ^(BOOL finished) {
      splashView.hidden = TRUE;
      //Shift the splash view back into place in case we want to display it again.
      CGPoint splashCenter;
      splashCenter = splashView.center;
      splashCenter.y += shift;
      splashView.center = splashCenter;
    }
    ];
}

If you want to support iOS versions prior to 4.0, you can use a similar approach to the above using the UIView class methods beginAnimations:context: ... commitAnimations. In that case, though, you would need to set up a separate hideSplash method, and invoke it using performSelector:withObject:afterDelay so you delay sliding the splash-screen away.