refactor: add dark theme support for demo app

Author: htmlprogrammist

Example App/EmojiPicker.xcodeproj/project.pbxproj

@@ -16,7 +16,7 @@
 
 /* Begin PBXFileReference section */
 		028AB9FF7F7146CA02C6047E /* Pods-EmojiPicker_Example.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-EmojiPicker_Example.debug.xcconfig"; path = "Target Support Files/Pods-EmojiPicker_Example/Pods-EmojiPicker_Example.debug.xcconfig"; sourceTree = "<group>"; };
-		39C5556144E64B4781AC3E2C /* EmojiPicker.podspec */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text; name = EmojiPicker.podspec; path = ../EmojiPicker.podspec; sourceTree = "<group>"; };
+		39C5556144E64B4781AC3E2C /* EmojiPicker.podspec */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text; name = EmojiPicker.podspec; path = ../EmojiPicker.podspec; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.ruby; };
 		4E7BA306C8344910609AD79B /* LICENSE */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text; name = LICENSE; path = ../LICENSE; sourceTree = "<group>"; };
 		52C75966261C87A105AE3101 /* Pods_EmojiPicker_Example.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_EmojiPicker_Example.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		607FACD01AFB9204008FA782 /* EmojiPicker_Example.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = EmojiPicker_Example.app; sourceTree = BUILT_PRODUCTS_DIR; };

Example App/EmojiPicker.xcworkspace/xcuserdata/egbad.xcuserdatad/UserInterfaceState.xcuserstate

@@ -16,10 +16,6 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
 
         let window = UIWindow(frame: UIScreen.main.bounds)
-        
-        if #available(iOS 13.0, *) {
-            window.overrideUserInterfaceStyle = .light
-        }
         window.rootViewController = ViewController()
         window.makeKeyAndVisible()
         self.window = window

Example App/EmojiPicker/AppDelegate.swift

@@ -34,7 +34,12 @@ class ViewController: UIViewController {
     }
 
     private func setupView() {
-        view.backgroundColor = .white
+        if #available(iOS 13.0, *) {
+            view.backgroundColor = .systemBackground
+        } else {
+            view.backgroundColor = .white
+        }
+        
         view.addSubview(emojiButton)
 
         NSLayoutConstraint.activate([