AuthError.swift

func showError(error: LAError) {
        var message: String = ""
        switch error.code {
        case LAError.authenticationFailed:
            message = "Authentication was not successful because the user failed to provide valid credentials. Please enter password to login."
            break
        case LAError.userCancel:
            message = "Authentication was canceled by the user"
            break
        case LAError.userFallback:
            message = "Authentication was canceled because the user tapped the fallback button"
            break
        case LAError.touchIDNotEnrolled:
            message = "Authentication could not start because Touch ID has no enrolled fingers."
            break
        case LAError.passcodeNotSet:
            message = "Passcode is not set on the device."
            break
        case LAError.systemCancel:
            message = "Authentication was canceled by system"
            break
        default:
            message = error.localizedDescription
            break
        }
        self.showPopupWithMessage(message)
    }