AI-generated Key Takeaways
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          GADMediaContent provides information about media content and should be interacted with on the main queue. 
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          You can check if the media content has video using the hasVideoContentproperty and control video playback with thevideoController.
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          The aspectRatioproperty provides the width/height ratio of the media content, returning 0 if unknown or no media content exists.
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          For video content, you can access its durationandcurrentTimein seconds, both returning 0 if there's no video or the information is unknown.
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          Native ads can use the mainImageproperty to display an image when video content is not present.
GADMediaContent
@interface GADMediaContent : NSObjectProvides media content information. Interact with instances of this class on the main queue only.
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                  Controls the media content’s video. DeclarationSwift var videoController: VideoController { get }Objective-C @property (nonatomic, readonly, nonnull) GADVideoController *videoController;
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                  Indicates whether the media content has video content. DeclarationSwift var hasVideoContent: Bool { get }Objective-C @property (nonatomic, readonly) BOOL hasVideoContent;
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                  Media content aspect ratio (width/height). The value is 0 when there’s no media content or the media content aspect ratio is unknown. DeclarationSwift var aspectRatio: CGFloat { get }Objective-C @property (nonatomic, readonly) CGFloat aspectRatio;
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                  The video’s duration in seconds or 0 if there’s no video or the duration is unknown. DeclarationSwift var duration: TimeInterval { get }Objective-C @property (nonatomic, readonly) NSTimeInterval duration;
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                  The video’s current playback time in seconds or 0 if there’s no video or the current playback time is unknown. DeclarationSwift var currentTime: TimeInterval { get }Objective-C @property (nonatomic, readonly) NSTimeInterval currentTime;