One Quickie

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Modal View Controllers (UIViewController->General)

Present a modal view controller (iOS 5 and beyond):

    [self presentViewController: vc  animated: YES
          completion: ^{
            NSLog (@"you complete me");
    }];

and to get rid of it

    [self dismissViewControllerAnimated: YES  completion: ^(void) {
            NSLog (@"kompressor does not dance");
    }];

Pre-iOS 5

Present a modal view controller:

    [self presentModalViewController: webview  animated: YES];

And to get rid of it (maybe from inside of the view controller that just got modalated)

    [self dismissModalViewControllerAnimated: YES];