iOS - presentViewController with transparency

Question

I would like to present a view controller full screen semi-transparently so that I still see the view underneath it. The following code presents the new view controller, but it replaces the current one. What is the best way to keep the original view controller visible? The view of the new view controller will have a semi-transparent black background.

NewViewController* newVC = [[NSClassFromString(@"NewViewController") alloc] initWithNibName:deviceNib bundle:nil];
newVC.modalPresentationStyle = UIModalPresentationFullScreen;
newVC.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;


[self presentViewController:newVC animated:YES completion:NULL];

Answer 1

Present a semi-transparent View, not a view controller.

mySemiTransparentView.alpha = 0.0f;
[self.view addSubview:mySemiTransparentView];

mySemiTransparentView is your full-screen view. You can animate it into place:

[UIView beginAnimations:@"fadeIn" context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationDuration:0.4f];
mySemiTransparentView.alpha = 0.5f;
[UIView commitAnimations];