AI-generated Key Takeaways
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          IMACompanionDelegate receives events from the companion ad slot. 
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          The companionSlot:filled:method is called when the slot is filled or not filled.
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          The companionSlotWasClicked:method is called when the slot is clicked by the user and navigates away.
IMACompanionDelegate
@protocol IMACompanionDelegate <NSObject>Delegate to receive events from the companion ad slot.
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                  Called when the slot is either filled or not filled. DeclarationSwift optional func companionSlot(_ slot: IMACompanionAdSlot, filled: Bool)Objective-C - (void)companionSlot:(nonnull IMACompanionAdSlot *)slot filled:(BOOL)filled;Parametersslotthe IMACompanionAdSlot receiving the event filledis the slot filled or not 
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                  Called when the slot is clicked on by the user and will successfully navigate away. DeclarationSwift optional func companionSlotWasClicked(_ slot: IMACompanionAdSlot)Objective-C - (void)companionSlotWasClicked:(nonnull IMACompanionAdSlot *)slot;Parametersslotthe IMACompanionAdSlot receiving the event