只能使用TouchID吗?

有可能吗?或者使用canEvaluatePolicy我必须同时使用强制性的两种?

context.evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, localizedReason: "Logging in with Touch ID", reply: { (success : Bool, error : NSError? ) -> Void in
        dispatch_async(dispatch_get_main_queue(), {

        if success {
            let alert = UIAlertController(title: "Success", message: "", cancelButtonTitle: "Great!")
            self.presentViewController(alert, animated: true, completion: nil)
        }

        if let error = error {
            var message :String

            switch(error.code) {
            case LAError..AuthenticationFailed:
                message = "There was a problem verifying your identity."
            case LAError..UserCancel:
                message = "You pressed cancel."
            case LAError..UserFallback:
                message = "You pressed password."
            default:
                message = "Touch ID may not be configured"
            }

            let alert = UIAlertController(title: "Error", message: message, cancelButtonTitle: "Darn!")
            self.presentViewController(alert, animated: true, completion: nil)
        }

        context = LAContext()
    })
})