trying to implement [self.delegate.view addSubview:] - objective-c

Question

I am trying to make a reusable class that handles iAds.
In my .h file I do the following:
#import <iAd/iAd.h>
#protocol AdHelperDelegate;
#interface AdHelper:NSObject<ADBannerViewDelegate>
#property (strong) id<AdHelperDelegate> delegate;
#property (nonatomic, strong) ADBannerView *iAdBannerView;
...
#end
#protocol AdHelperDelegate;
#end
Then in my .m file I implement the iAd banner:
-(void)showBanner
{
self.iAdBannerView = [[ADBannerView alloc] initWithFrame:CGRectZero];
self.iAdBannerView.frame = CGRectOffset(self.iAdBannerView.frame, 0, 361);
self.iAdBannerView.requiredContentSizeIdentifiers = [NSSet setWithObject:ADBannerContentSizeIdentifierPortrait];
self.iAdBannerView.currentContentSizeIdentifier = ADBannerContentSizeIdentifierPortrait;
self.iAdBannerView.delegate = self;
[self.delegate.view addSubview:self.iAdBannerView];
}
I of course also implement the delegate method -(void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
I am planing to call up the AdHelper in a UIViewController in my project
with something like:
AdHelper *ah = [[AdHelper alloc] init];
ah.delegate = self;
[ah showBanner];
Problem is that the compiler is saying: Property 'view' not found on object of type 'id<AdHelperDelegate>'
Is there a way for me to access the delegate's view?

Answer 1

You need to manually cast your view controller so that the compiler knows what kind of object you have:
[((MyViewController *)self.delegate).view addSubview:self.iAdBannerView];
You could also change the declaration of the view from id<AdHelperDelegate> to UIViewController<AdHelperDelegate>*, which would eliminate the need for casting in this case.

Answer 2

You need to cast the id to a UIViewController. The compiler has no way of knowing that id has a view property.
[((UIViewController *)self.delegate).view addSubview:self.iAdBannerView];