gistfile1.m

// MyDelegate.m
-(void)vungleMoviePlayed:(VGPlayData*)playData
{
  // movie ad finished, get times from playData
  if ([playData playedFull]) {
	// give reward to user
  }
}

// This is the code that initializes vungle
- (void)vungleStart {
    // assuming either self == instance of MyDelegate, or implements the VGVunglePubDelegate protocol
    [VGVunglePub setDelegate:self];
    // start vungle publisher library
    [VGVunglePub startWithPubAppID:[Prefs pubAppIDGet] userData:data];
}

// somewhere else in your app code
    [VGVunglePub playIncentivizedAd:vungleViewController animated:TRUE showClose:TRUE userTag:@"user123"];