One Quickie

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];

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Advanced Mac OS X Programming book