diff --git a/Example/BarcodeScannerExample/BarcodeScannerExample.xcodeproj/project.pbxproj b/Example/BarcodeScannerExample/BarcodeScannerExample.xcodeproj/project.pbxproj
index 997ff15..7d96d33 100644
--- a/Example/BarcodeScannerExample/BarcodeScannerExample.xcodeproj/project.pbxproj
+++ b/Example/BarcodeScannerExample/BarcodeScannerExample.xcodeproj/project.pbxproj
@@ -102,7 +102,6 @@
 				D50BE3F31C9FE8870000A34C /* Resources */,
 				E090C912AA824DD28A310598 /* [CP] Embed Pods Frameworks */,
 				C6637BE832A43C8F49FCF84D /* 📦 Embed Pods Frameworks */,
-				A8D9BF9C6304351F12DE8E23 /* 📦 Copy Pods Resources */,
 			);
 			buildRules = (
 			);
@@ -126,17 +125,16 @@
 					D50BE3F41C9FE8870000A34C = {
 						CreatedOnToolsVersion = 7.2.1;
 						DevelopmentTeam = XVAH95CHDC;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 1310;
 						ProvisioningStyle = Manual;
 					};
 				};
 			};
 			buildConfigurationList = D50BE3F01C9FE8870000A34C /* Build configuration list for PBXProject "BarcodeScannerExample" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
-				English,
 				en,
 				Base,
 			);
@@ -179,21 +177,6 @@
 			shellScript = "diff \"${PODS_ROOT}/../Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [[ $? != 0 ]] ; then\n    cat << EOM\nerror: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\nEOM\n    exit 1\nfi\n";
 			showEnvVarsInLog = 0;
 		};
-		A8D9BF9C6304351F12DE8E23 /* 📦 Copy Pods Resources */ = {
-			isa = PBXShellScriptBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-			);
-			inputPaths = (
-			);
-			name = "📦 Copy Pods Resources";
-			outputPaths = (
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-			shellPath = /bin/sh;
-			shellScript = "\"${SRCROOT}/Pods/Target Support Files/Pods-BarcodeScannerExample/Pods-BarcodeScannerExample-resources.sh\"\n";
-			showEnvVarsInLog = 0;
-		};
 		BDF82C3FF3E7C5A57E2534BE /* [CP] Check Pods Manifest.lock */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
@@ -406,7 +389,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE = "5429b4c3-def8-4c81-a541-9333e6f69af9";
 				PROVISIONING_PROFILE_SPECIFIER = "Wildcard Development";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -428,7 +411,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE = "";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
diff --git a/Example/BarcodeScannerExample/BarcodeScannerExample/AppDelegate.swift b/Example/BarcodeScannerExample/BarcodeScannerExample/AppDelegate.swift
index 9614d91..f258a44 100644
--- a/Example/BarcodeScannerExample/BarcodeScannerExample/AppDelegate.swift
+++ b/Example/BarcodeScannerExample/BarcodeScannerExample/AppDelegate.swift
@@ -5,7 +5,7 @@ import BarcodeScanner
 class AppDelegate: UIResponder, UIApplicationDelegate {
   var window: UIWindow?
   func application(_ application: UIApplication,
-                   didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+                   didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
     return true
   }
 }
diff --git a/Sources/Controllers/BarcodeScannerViewController.swift b/Sources/Controllers/BarcodeScannerViewController.swift
index 0a166a0..5e9c1db 100644
--- a/Sources/Controllers/BarcodeScannerViewController.swift
+++ b/Sources/Controllers/BarcodeScannerViewController.swift
@@ -31,6 +31,7 @@ import AVFoundation
  - Unauthorized mode
  - Not found error message
  */
+@objcMembers
 open class BarcodeScannerViewController: UIViewController {
   public static var footerHeight: CGFloat = 75
   @objc public var hideFooterView = false
diff --git a/Sources/Controllers/CameraViewController.swift b/Sources/Controllers/CameraViewController.swift
index f5a722d..814201c 100644
--- a/Sources/Controllers/CameraViewController.swift
+++ b/Sources/Controllers/CameraViewController.swift
@@ -2,18 +2,17 @@ import UIKit
 import AVFoundation
 
 /// Delegate to handle camera setup and video capturing.
-protocol CameraViewControllerDelegate: AnyObject {
+@objc protocol CameraViewControllerDelegate: AnyObject {
   func cameraViewControllerDidSetupCaptureSession(_ controller: CameraViewController)
   func cameraViewControllerDidFailToSetupCaptureSession(_ controller: CameraViewController)
   func cameraViewController(_ controller: CameraViewController, didReceiveError error: Error)
   func cameraViewControllerDidTapSettingsButton(_ controller: CameraViewController)
-  func cameraViewController(
-    _ controller: CameraViewController,
-    didOutput metadataObjects: [AVMetadataObject]
+  func cameraViewController(_ controller: CameraViewController, didOutput metadataObjects: [AVMetadataObject]
   )
 }
 
 /// View controller responsible for camera controls and video capturing.
+@objcMembers
 public final class CameraViewController: UIViewController {
   weak var delegate: CameraViewControllerDelegate?
 
@@ -380,7 +379,7 @@ private extension CameraViewController {
     videoPreviewLayer.frame = view.layer.bounds
 
     if let connection = videoPreviewLayer.connection, connection.isVideoOrientationSupported {
-      switch UIApplication.shared.statusBarOrientation {
+      switch UIApplication.interfaceOrientation {
       case .portrait:
         connection.videoOrientation = .portrait
       case .landscapeRight:
@@ -440,3 +439,16 @@ extension CameraViewController: AVCaptureMetadataOutputObjectsDelegate {
     delegate?.cameraViewController(self, didOutput: metadataObjects)
   }
 }
+
+// MARK: - Private
+
+private extension UIApplication {
+
+    static var interfaceOrientation: UIInterfaceOrientation? {
+        if #available(iOS 13.0, *) {
+            return UIApplication.shared.windows.first(where: { $0.isKeyWindow })?.windowScene?.interfaceOrientation
+        } else {
+            return UIApplication.shared.statusBarOrientation
+        }
+    }
+}
diff --git a/Sources/Controllers/HeaderViewController.swift b/Sources/Controllers/HeaderViewController.swift
index 8eb1c9e..4ec10c8 100644
--- a/Sources/Controllers/HeaderViewController.swift
+++ b/Sources/Controllers/HeaderViewController.swift
@@ -1,12 +1,13 @@
 import UIKit
 
 /// Delegate to handle touch event of the close button.
-protocol HeaderViewControllerDelegate: AnyObject {
+@objc protocol HeaderViewControllerDelegate: AnyObject {
   func headerViewControllerDidTapCloseButton(_ controller: HeaderViewController)
 }
 
 /// View controller with title label and close button.
 /// It will be added as a child view controller if `BarcodeScannerController` is being presented.
+@objcMembers
 public final class HeaderViewController: UIViewController {
   weak var delegate: HeaderViewControllerDelegate?
 
diff --git a/Sources/Controllers/MessageViewController.swift b/Sources/Controllers/MessageViewController.swift
index 3fab7ab..ac9a0e2 100644
--- a/Sources/Controllers/MessageViewController.swift
+++ b/Sources/Controllers/MessageViewController.swift
@@ -1,6 +1,7 @@
 import UIKit
 
 /// View controller used for showing info text and loading animation.
+@objcMembers
 public final class MessageViewController: UIViewController {
   // Image tint color for all the states, except for `.notFound`.
   public var regularTintColor: UIColor = .black
diff --git a/Sources/DataStructures/State.swift b/Sources/DataStructures/State.swift
index 4c42de5..a7a2be1 100644
--- a/Sources/DataStructures/State.swift
+++ b/Sources/DataStructures/State.swift
@@ -11,7 +11,7 @@ enum State {
 }
 
 /// State message provider.
-public struct StateMessageProvider {
+public class StateMessageProvider: NSObject {
   public var scanningText = localizedString("INFO_DESCRIPTION_TEXT")
   public var processingText = localizedString("INFO_LOADING_TITLE")
   public var unathorizedText = localizedString("ASK_FOR_PERMISSION_TEXT")