GMSNavigationCameraMode
enum GMSNavigationCameraMode : NSInteger {}The camera mode which determines the camera following behavior.
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                  Disables camera following. The camera is in this mode when it is being panned by the user. DeclarationSwift case free = 0Objective-C GMSNavigationCameraModeFree = 0
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                  Follows the user location with the current followingPerspective. DeclarationSwift case following = 1Objective-C GMSNavigationCameraModeFollowing
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                  Shows an overview of the remaining route. This is dynamically updated in guidance mode. DeclarationSwift case overview = 2Objective-C GMSNavigationCameraModeOverview