GMSNavigationNavState
enum GMSNavigationNavState : NSInteger {}The state of navigation.
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                  Error or unspecified state. DeclarationSwift case unknown = 0Objective-C GMSNavigationNavStateUnknown = 0
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                  Actively navigating. Information about the upcoming maneuver step is available. DeclarationSwift case enroute = 1Objective-C GMSNavigationNavStateEnroute = 1
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                  Actively navigating but searching for a new route. The upcoming maneuver step is not yet available. DeclarationSwift case rerouting = 2Objective-C GMSNavigationNavStateRerouting = 2
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                  Navigation has ended. DeclarationSwift case stopped = 3Objective-C GMSNavigationNavStateStopped = 3