AdWhirl implementation in iPhone Cocoa touch

i'm starting to implement AdWhirl in my application. i follow the instructions which is belong to adwhirl but i cant see any ad in my application.i add the following methods in my viewcontroller class

- (void)viewDidLoad {
    [super viewDidLoad];
 AdWhirlView *adView=[AdWhirlView requestAdWhirlViewWithDelegate:self];
 [self.view addSubview:adView];
}

-(NSString *) adWhirlApplicationKey{
 return @"myAdWhirlKey";
}

-(UIViewController *) viewControllerForPresentingMod开发者_JAVA技巧alView{
 return self;
}

i doesn't display anything. please help how to implement AdWhirl

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you need to see AdWhirl tutorial and you can download it from here Tutorial

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You need to pass the AdWhirl SDK key in adWhirlApplicationKey delegate to work. check the link to get adWhirlkey... http://chandanshetty01.blogspot.com/2011/06/integrating-ads-to-ios-apps-using.html