Allow Swift 5 Subclassing

Package.swift

@@ -0,0 +1,26 @@
+// swift-tools-version:5.3
+import PackageDescription
+
+let package = Package(
+    name: "SwiftPhoneNumberFormatter",
+    platforms: [.iOS(.v9)],
+    products: [
+        .library(
+            name: "PhoneNumberFormatter",
+            targets: ["PhoneNumberFormatter"]),
+    ],
+    dependencies: [
+    ],
+    targets: [
+        .target(
+            name: "PhoneNumberFormatter",
+            dependencies: [],
+            path: "PhoneNumberFormatter/Sources"
+        ),
+        .testTarget(
+            name: "PhoneNumberFormatterTests",
+            dependencies: ["PhoneNumberFormatter"]
+        ),
+    ],
+    swiftLanguageVersions: [.v5]
+)

PhoneNumberFormatter.podspec

@@ -0,0 +1,13 @@
+Pod::Spec.new do |s|
+  s.name           = "PhoneNumberFormatter"
+  s.version        = "1.5.rc.1"
+  s.summary        = "PhoneNumberFormatter for iOS"
+  s.homepage       = "https://github.com/Nixon506E/PhoneNumberFormatter"
+  s.license        = 'MIT'
+  s.author         = { "Sergei Shatunov" => "sshatunov@gmail.com" }
+  s.source         = { :git => "https://github.com/Nixon506E/PhoneNumberFormatter.git", :tag => s.version.to_s }
+  s.platform       = :ios, '9.0'
+  s.swift_versions = ['5.0']
+  s.source_files   = 'PhoneNumberFormatter/Sources/**/*.{swift}'
+  s.requires_arc   = true
+end

PhoneNumberFormatter/Sources/PhoneFormattedTextField.swift

@@ -11,7 +11,7 @@ import UIKit
 /**
  UITextField subclass to handle phone numbers formats
 */
-public class PhoneFormattedTextField: UITextField {
+open class PhoneFormattedTextField: UITextField {
 
     private let formatProxy: FormattedTextFieldDelegate
     private let formatter: PhoneFormatter