Objective-C NS_ENUM not recognized in Swift - objective-c

Question

I am using the google VR SDK external framework in my swift project.
In my Bridging-Header.h I am importing the framework header
#import "GVRCardboardView.h"
In GVRCardboardView.h there is this:
typedef NS_ENUM(NSInteger, GVRUserEvent) {
kGVRUserEventBackButton,
kGVRUserEventTilt,
kGVRUserEventTrigger,
};
In my swift code
#objc func cardboardView(_ cardboardView: GVRCardboardView!, didFire event: GVRUserEvent) {
switch (event) {
case kGVRUserEventBackButton:
print("User pressed back button");
break;
case GVRUserEvent.kGVRUserEventTilt:
print("User performed tilt action");
break;
case .kGVRUserEventTrigger:
print("User performed trigger action");
break;
}
}
But I get compiler errors. You can see I'm trying three different ways to access the enum values in my switch case, and they all give errors. First,
Use of unresolved identifier 'kGVRUserEventTilt'
When I searched other similar questions online, I saw the solution was to include the name of the enum, like you see in the second case of my switch statement. But that gives me this error:
Type 'GVRUserEvent' has no member 'kGVRUserEventTilt'
And the third case gives this:
Pattern cannot match values of type 'GVRUserEvent'
Anyone know why? It recognizes GVRUserEvent as something -- I don't get errors in the argument line.
Thanks for any help!