This project gives you a drop-in PIN code entry screen that looks like the entry screen seen in Settings.app.

• native iOS look and feel
• mask pin entry with bullet characters or optionally show the actual input
• provide your own theme by providing a custom NIB file
• provide custom text to be displayed on the PIN entry view
• delegate methods allow you to verify the user-provided PIN code

• open the PINView Xcode project
• drag the pinview group into your project (make sure copy files is selected)

• create the pin view object using the initWithNibName:bundle: of UIViewController
• set the delegate on the view controller (YOU MUST DO THIS)
• implement the isPINCodeValid: delegate method to allow validation of the provided code
• set options like the view title or error text
• display from a view controller using the presentViewFromViewController:animated: convenience method

- (BOOL)isPINCodeValid:(NSString *)PIN {
  return [PIN isEqualToString:@"1234"];
}

GCPINViewController *pinView = [[GCPINViewController alloc] initWithNibName:@"PINViewDefault" bundle:nil];
[pinView setDelegate:self];
[pinView setPromptText:@"Enter Your PIN"];
[pinView setTitleText:@"PIN Code"];
[pinView setErrorText:@"Awww You Suck"];

I haven't tested this, but you should be able to create a custom NIB file containing the appropriate elements changing the background or keyboard style (dark vs. default)

Just change the NIB name you pass in the initWithNibName:bundle call