ioskevinshah

import LocalAuthentication

/// AuthenticationBlockState
enum AuthenticationBlockState {
    case success
    case failed
    case canceledByUser
    case fallback
    case canceledBySystem
    case passcodeNotSet

ioskevinshah

let kReasonMessage = "Biometeric required your authentication."

/// Biometric Default Reason(s)
let kBiometryNotAvailableReason = "Biometric authentication is not available for this device."

/// Common Message(s)
let kSetPasscode = "Please set device passcode for authentication."

/// TouchID Related Message(s)
let kTouchIdAuthenticationReason = "Confirm your fingerprint to authenticate."

ioskevinshah

/// Change default message as per your need.
fileprivate static var defaultReasonMessage: String {
    return LocalAuthentication.isFaceIdAvailable ? kFaceIdAuthenticationReason : kTouchIdAuthenticationReason
}

ioskevinshah

/// Variable Declaration(s)
class var isFaceIdAvailable: Bool {
    let context: LAContext = LAContext()
    let evaluate = context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil)
    if #available(iOS 11.0, *) {
        return (context.biometryType == .faceID)
    }
    return evaluate
}