AI-generated Key Takeaways
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          IMAAdEvent is a simple data class used to transport ad playback information. 
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          It contains properties for the event type, stringified event type, the current ad, and extra data about the ad. 
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          The adproperty is nil except for events where an ad is available (start, quartiles, midpoint, complete, and tap).
IMAAdEvent
@interface IMAAdEvent : NSObjectSimple data class used to transport ad playback information.
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                  Type of the event. DeclarationSwift var type: IMAAdEventType { get }Objective-C @property (nonatomic, readonly) IMAAdEventType type;
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                  Stringified type of the event. DeclarationSwift var typeString: String { get }Objective-C @property (nonatomic, copy, readonly) NSString *_Nonnull typeString;
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                  Extra data about the ad. DeclarationSwift var adData: [String : Any]? { get }Objective-C @property (nonatomic, copy, readonly, nullable) NSDictionary<NSString *, id> *adData;