enum PlaybackStateEnumPlayback states.
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                  The media is currently playing, fast-forwarding, or rewinding. DeclarationSwift case playing
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                  The media is currently paused. DeclarationSwift case paused
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                  The media is not currently playing. DeclarationSwift case notPlaying
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                  The media is not currently buffering, playback will start when buffer is filled. DeclarationSwift case buffering
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                  Creates a new instance with the specified raw value. If there is no value of the type that corresponds with the specified raw value, this initializer returns nil. For example:enum PaperSize: String { case A4, A5, Letter, Legal } print(PaperSize(rawValue: "Legal")) // Prints "Optional(PaperSize.Legal)" print(PaperSize(rawValue: "Tabloid")) // Prints "nil"DeclarationSwift init?(rawValue: UInt64)ParametersrawValueThe raw value to use for the new instance.