diff --git a/BiometricAuthentication/BiometricAuthentication/Authentication/AuthenticationErrors.swift b/BiometricAuthentication/BiometricAuthentication/Authentication/AuthenticationErrors.swift
index 3f5316b..e46fc7e 100644
--- a/BiometricAuthentication/BiometricAuthentication/Authentication/AuthenticationErrors.swift
+++ b/BiometricAuthentication/BiometricAuthentication/Authentication/AuthenticationErrors.swift
@@ -75,3 +75,51 @@ public enum AuthenticationError: Error {
         }
     }
 }
+
+@objc public enum AuthenticationErrorOBJC: Int {
+    case failed, canceledByUser, fallback, canceledBySystem, passcodeNotSet, biometryNotAvailable, biometryNotEnrolled, biometryLockedout, other
+    
+    public static func initWithError(_ error: LAError) -> AuthenticationErrorOBJC {
+        switch Int32(error.errorCode) {
+            
+        case kLAErrorAuthenticationFailed:
+            return failed
+        case kLAErrorUserCancel:
+            return canceledByUser
+        case kLAErrorUserFallback:
+            return fallback
+        case kLAErrorSystemCancel:
+            return canceledBySystem
+        case kLAErrorPasscodeNotSet:
+            return passcodeNotSet
+        case kLAErrorBiometryNotAvailable:
+            return biometryNotAvailable
+        case kLAErrorBiometryNotEnrolled:
+            return biometryNotEnrolled
+        case kLAErrorBiometryLockout:
+            return biometryLockedout
+        default:
+           return other
+        }
+    }
+    
+    // get error message based on type
+    public func message() -> String {
+        let authentication = BioMetricAuthenticator.shared
+        
+        switch self {
+        case .canceledByUser, .fallback, .canceledBySystem:
+            return ""
+        case .passcodeNotSet:
+            return authentication.faceIDAvailable() ? kSetPasscodeToUseFaceID : kSetPasscodeToUseTouchID
+        case .biometryNotAvailable:
+            return kBiometryNotAvailableReason
+        case .biometryNotEnrolled:
+            return authentication.faceIDAvailable() ? kNoFaceIdentityEnrolled : kNoFingerprintEnrolled
+        case .biometryLockedout:
+            return authentication.faceIDAvailable() ? kFaceIdPasscodeAuthenticationReason : kTouchIdPasscodeAuthenticationReason
+        default:
+            return authentication.faceIDAvailable() ? kDefaultFaceIDAuthenticationFailedReason : kDefaultTouchIDAuthenticationFailedReason
+        }
+    }
+}
diff --git a/BiometricAuthentication/BiometricAuthentication/Authentication/BioMetricAuthenticator.swift b/BiometricAuthentication/BiometricAuthentication/Authentication/BioMetricAuthenticator.swift
index 89e652f..862751b 100644
--- a/BiometricAuthentication/BiometricAuthentication/Authentication/BioMetricAuthenticator.swift
+++ b/BiometricAuthentication/BiometricAuthentication/Authentication/BioMetricAuthenticator.swift
@@ -26,10 +26,10 @@
 import UIKit
 import LocalAuthentication
 
-open class BioMetricAuthenticator: NSObject {
+@objc open class BioMetricAuthenticator: NSObject {
 
     // MARK: - Singleton
-    public static let shared = BioMetricAuthenticator()
+    @objc public static let shared = BioMetricAuthenticator()
     
     // MARK: - Private
     private override init() {}
@@ -52,10 +52,15 @@ open class BioMetricAuthenticator: NSObject {
 
 // MARK:- Public
 
-public extension BioMetricAuthenticator {
+@objc public protocol BioMetricAuthenticatorController {
+    func biometricResultOK() -> Void;
+    func biometricError(error: AuthenticationErrorOBJC) -> Void;
+}
+
+@objc public extension BioMetricAuthenticator {
     
     /// checks if biometric authentication can be performed currently on the device.
-    class func canAuthenticate() -> Bool {
+    @objc class func canAuthenticate() -> Bool {
         
         var isBiometricAuthenticationAvailable = false
         var error: NSError? = nil
@@ -67,11 +72,25 @@ public extension BioMetricAuthenticator {
     }
     
     /// Check for biometric authentication
-    class func authenticateWithBioMetrics(reason: String, fallbackTitle: String? = "", cancelTitle: String? = "", completion: @escaping (Result<Bool, AuthenticationError>) -> Void) {
+    @nonobjc class func authenticateWithBioMetrics(reason: String, fallbackTitle: String? = "", cancelTitle: String? = "", completion: @escaping (Result<Bool, AuthenticationError>) -> Void) {
+        
+        let reasonString = reason.isEmpty ? BioMetricAuthenticator.shared.defaultBiometricAuthenticationReason() : reason
+        let context = getContext(reason: reason, fallbackTitle: fallbackTitle, cancelTitle: cancelTitle);
+        
+        // authenticate
+        BioMetricAuthenticator.shared.evaluate(policy: .deviceOwnerAuthenticationWithBiometrics, with: context, reason: reasonString, completion: completion)
+    }
+    
+    @objc class func authenticateWithBioMetrics(reason: String, fallbackTitle: String? = "", cancelTitle: String? = "", completion: BioMetricAuthenticatorController) {
         
-        // reason
         let reasonString = reason.isEmpty ? BioMetricAuthenticator.shared.defaultBiometricAuthenticationReason() : reason
+        let context = getContext(reason: reason, fallbackTitle: fallbackTitle, cancelTitle: cancelTitle);
         
+        // authenticate
+        BioMetricAuthenticator.shared.evaluate(policy: .deviceOwnerAuthenticationWithBiometrics, with: context, reason: reasonString, completion: completion)
+    }
+    
+    class func getContext(reason: String, fallbackTitle: String? = "", cancelTitle: String? = "") -> LAContext{
         // context
         var context: LAContext!
         if BioMetricAuthenticator.shared.isReuseDurationSet() {
@@ -86,12 +105,33 @@ public extension BioMetricAuthenticator {
             context.localizedCancelTitle = cancelTitle
         }
         
+        return context;
+    }
+    
+    /// Check for device passcode authentication
+    @nonobjc class func authenticateWithPasscode(reason: String, cancelTitle: String? = "", completion: @escaping (Result<Bool, AuthenticationError>) -> ()) {
+        
+        // reason
+        let reasonString = reason.isEmpty ? BioMetricAuthenticator.shared.defaultPasscodeAuthenticationReason() : reason
+        
+        let context = LAContext()
+        
+        // cancel button title
+        if #available(iOS 10.0, *) {
+            context.localizedCancelTitle = cancelTitle
+        }
+        
         // authenticate
-        BioMetricAuthenticator.shared.evaluate(policy: .deviceOwnerAuthenticationWithBiometrics, with: context, reason: reasonString, completion: completion)
+        if #available(iOS 9.0, *) {
+            BioMetricAuthenticator.shared.evaluate(policy: .deviceOwnerAuthentication, with: context, reason: reasonString, completion: completion)
+        } else {
+            // Fallback on earlier versions
+            BioMetricAuthenticator.shared.evaluate(policy: .deviceOwnerAuthenticationWithBiometrics, with: context, reason: reasonString, completion: completion)
+        }
     }
     
     /// Check for device passcode authentication
-    class func authenticateWithPasscode(reason: String, cancelTitle: String? = "", completion: @escaping (Result<Bool, AuthenticationError>) -> ()) {
+    @objc class func authenticateWithPasscode(reason: String, cancelTitle: String? = "", completion: BioMetricAuthenticatorController) {
         
         // reason
         let reasonString = reason.isEmpty ? BioMetricAuthenticator.shared.defaultPasscodeAuthenticationReason() : reason
@@ -113,7 +153,7 @@ public extension BioMetricAuthenticator {
     }
     
     /// checks if device supports face id authentication
-    func faceIDAvailable() -> Bool {
+    @objc func faceIDAvailable() -> Bool {
         if #available(iOS 11.0, *) {
             let context = LAContext()
             return (context.canEvaluatePolicy(LAPolicy.deviceOwnerAuthenticationWithBiometrics, error: nil) && context.biometryType == .faceID)
@@ -122,7 +162,7 @@ public extension BioMetricAuthenticator {
     }
     
     /// checks if device supports touch id authentication
-    func touchIDAvailable() -> Bool {
+    @objc func touchIDAvailable() -> Bool {
         let context = LAContext()
         var error: NSError?
         
@@ -134,6 +174,7 @@ public extension BioMetricAuthenticator {
     }
 }
 
+
 // MARK:- Private
 extension BioMetricAuthenticator {
 
@@ -155,6 +196,19 @@ extension BioMetricAuthenticator {
         return true
     }
     
+    private func evaluate(policy: LAPolicy, with context: LAContext, reason: String, completion: BioMetricAuthenticatorController) {
+        
+        context.evaluatePolicy(policy, localizedReason: reason) { (success, err) in
+            DispatchQueue.main.async {
+                if success {
+                    completion.biometricResultOK();
+                } else {
+                    completion.biometricError(error: AuthenticationErrorOBJC.initWithError(err as! LAError));
+                }
+            }
+        }
+    }
+    
     /// evaluate policy
     private func evaluate(policy: LAPolicy, with context: LAContext, reason: String, completion: @escaping (Result<Bool, AuthenticationError>) -> ()) {