TrackUpdateEvent
@objc(THEOplayerTrackUpdateEvent)
public class TrackUpdateEvent : NSObject, _TrackEventProtocolFired when one or more properties of a track have been updated.
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                  The textual representation of the type of event, “update”. DeclarationSwift public private(set) var type: String { get }
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                  The date at which the event occurred. DeclarationSwift public private(set) var date: Date { get }
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                  The track that has been updated. DeclarationSwift public private(set) var track: Track { get }
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                  The track that has been updated. DeclarationSwift @objc(track) public var track_Objc: Track_Objc { get }
