#import "UIViewController_TourGuide.h"

@implementation UIViewController (TourGuide)

//...

- (void) tourGuideWillAppear:(BOOL)animated {
  // call the old implementation, now under the new message signature
  [self tourGuideWillAppear:animated];
  
  if (![self isTourRan]) {
    [self displayTour];
  }
}

//...

@end