Quickies for UIViewController

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General

• Changing title of Back Button [permalink]
  Sometimes the default title of the UIViewController "Back" button isn't quite right. To change it to something else, do this:

      UIBarButtonItem *backButton =
          [[UIBarButtonItem alloc] initWithTitle: @"Back"
                                   style: UIBarButtonItemStyleBordered
                                   target: nil
                                   action: nil];
      self.navigationItem.backBarButtonItem = backButton;
      [backButton release];
  

  The catch is you need to do it in the parent controller before pushing the subcontroller. You can stick this into the -init and change it once

• Making BNR-Style View Controller [permalink]
  One of the things I like about the Big Nerd Ranch iPhone book is how they put the name of the nib file in a ViewController's implementation, rather than making all users of the ViewController know the nib file name. Here's how they do it:

  @implementation BlahViewController
  
  - (id) init {
      if ((self = [super initWithNibName: @"BlahViewController"
                         bundle: nil])) {
          // other initialization
      }
      return self;
  } // init
  
  
  - (id) initWithNibName: (NSString *) nibNameOrNil
                  bundle: (NSBundle *) nibBundleOrNil {
      return [self init];
  } // initWithNibName
  

• Modal View Controllers [permalink]
  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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