AI-generated Key Takeaways
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          GADAdLoaderDelegate is the base protocol for ad loader delegates. 
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          The adLoader:didFailToReceiveAdWithError:method is called when the ad loader fails to load an ad.
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          The adLoaderDidFinishLoading:method is called after the ad loader has finished loading.
GADAdLoaderDelegate
@protocol GADAdLoaderDelegate <NSObject>Base ad loader delegate protocol. Ad types provide extended protocols that declare methods to handle successful ad loads.
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                  Called when adLoader fails to load an ad. DeclarationSwift func adLoader(_ adLoader: GADAdLoader, didFailToReceiveAdWithError error: any Error)Objective-C - (void)adLoader:(nonnull GADAdLoader *)adLoader didFailToReceiveAdWithError:(nonnull NSError *)error;
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                  Called after adLoader has finished loading. DeclarationSwift optional func adLoaderDidFinishLoading(_ adLoader: GADAdLoader)Objective-C - (void)adLoaderDidFinishLoading:(nonnull GADAdLoader *)adLoader;