TrackChangeEvent
@objc(THEOplayerTrackChangeEvent)
public class TrackChangeEvent : NSObject, _TrackEventProtocolFired when TextTrackListEventTypes.CHANGE occurs for a TextTrackList.
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                  The textual representation of the type of event, “change”. 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 Trackwhich has its state just changed.DeclarationSwift @objc(track) public var track_Objc: Track_Objc { get }
