GCExtendedGamepad(SteamController)
@interface GCExtendedGamepad (SteamController)Extension to GCExtendedGamepad to support additional buttons in the Steam Controller.
For a non-steam controller, the additional buttons will return nil.
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                  The left pointing button to the left of the Steam button. DeclarationObjective-C @property (nonatomic, readonly, nullable) GCControllerButtonInput *steamBackButton;Swift var steamBackButton: GCControllerButtonInput? { get }
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                  The right pointing button to the right of the Steam button. DeclarationObjective-C @property (nonatomic, readonly, nullable) GCControllerButtonInput *steamForwardButton;Swift var steamForwardButton: GCControllerButtonInput? { get }
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                  The Steam button. DeclarationObjective-C @property (nonatomic, readonly, nullable) GCControllerButtonInput *steamSteamButton;Swift var steamSteamButton: GCControllerButtonInput? { get }
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           GCExtendedGamepad(SteamController) Category Reference
      GCExtendedGamepad(SteamController) Category Reference