OverlayInterstitial
public protocol OverlayInterstitial : InterstitialThe THEOads interstitial that corresponds with overlay playback.
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                  The url of the image of the overlay. DeclarationSwift var imageUrl: String? { get }
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                  The clickThrough url of the overlay. DeclarationSwift var clickThrough: String? { get }
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                  The position of the overlay. DeclarationSwift var position: OverlayPosition { get }
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                  The size of the overlay. DeclarationSwift var size: OverlaySize { get }
