Touch Id Authentication

LocalAuthTouchId

import UIKit
import LocalAuthentication

func requestFingerprintAuthentication() {
    let context = LAContext()
    var authError: NSError?
    let authenticationReason: String = "To display a message to the user"
    
    if context.canEvaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, error: &authError) {
        context.evaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, localizedReason: authenticationReason, reply: {
            (success: Bool, error: NSError?) -> Void in
            if success {
                print("Success")
            } else {
                print("Unable to Authenticate")
            }
        } as! (Bool, Error?) -> Void)
    }
}


func updateMessageLabel(message: String) {
    
    DispatchQueue.main.async {
        print(message)
    }
}