DurationChangeEvent
@objc(THEOplayerDurationChangeEvent)
public class DurationChangeEvent : PlayerEventFired when PlayerEventTypes.DURATION_CHANGE occurs for the THEOplayer.
Remark
- One of the cases where the duration is updated, is when you set a new source.
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                  The new duration of the content, in seconds. DeclarationSwift public private(set) var duration: Double? { get }
 DurationChangeEvent Class Reference
      DurationChangeEvent Class Reference