title: AdWhirl implementation in iPhone Cocoa touch
body: <p>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</p>
  
  <pre><code>- (void)viewDidLoad {
      [super viewDidLoad];
   AdWhirlView *adView=[AdWhirlView requestAdWhirlViewWithDelegate:self];
   [self.view addSubview:adView];
  }
  
  -(NSString *) adWhirlApplicationKey{
   return @"myAdWhirlKey";
  }
  
  -(UIViewController *) viewControllerForPresentingModalView{
   return self;
  }
  </code></pre>
  
  <p>i doesn't display anything. please help how to implement AdWhirl</p>