FIRInAppMessagingImageOnlyDisplay
@interface FIRInAppMessagingImageOnlyDisplay : FIRInAppMessagingDisplayMessageClass for defining a image-only message for display. This class is unavailable on macOS, macOS Catalyst, and watchOS.
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                  Gets the image for this message DeclarationObjective-C @property (nonatomic, copy, readonly, nonnull) FIRInAppMessagingImageData *imageData;
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                  Gets the action URL for an image-only fiam message. DeclarationObjective-C @property (nonatomic, readonly, nullable) NSURL *actionURL;
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                  Unavailable Unavailable. DeclarationObjective-C - (nonnull instancetype)init;
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                  Exposed for unit testing only, or for use in SwiftUI previews. Don’t instantiate this in your app directly. DeclarationObjective-C - (nonnull instancetype) initWithCampaignName:(nonnull NSString *)campaignName imageData:(nonnull FIRInAppMessagingImageData *)imageData actionURL:(nullable NSURL *)actionURL appData:(nullable NSDictionary *)appData;