added live logic for checking/saving app version to clear cache

Signed-off-by: Matt Bruce <mbrucedogs@gmail.com>

EmployeeDirectory/SceneDelegate.swift

@@ -11,6 +11,25 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 
     var window: UIWindow?
 
+    let keyAppVersion = "savedAppVersion"
+    
+    func getAppVersion() -> String {
+        if let version = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String,
+           let build = Bundle.main.infoDictionary?["CFBundleVersion"] as? String {
+            return "\(version) (\(build))"
+        }
+        return "Unknown Version"
+    }
+    
+    // Retrieve saved version
+    func getSavedAppVersion() -> String? {
+        return UserDefaults.standard.string(forKey: keyAppVersion)
+    }
+    
+    func saveAppVersion(_ version: String) {
+        UserDefaults.standard.set(version, forKey: keyAppVersion)
+        UserDefaults.standard.synchronize()
+    }
 
     func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
         
@@ -25,13 +44,19 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         let navigationController = UINavigationController(rootViewController: employeeListVC)
         window.rootViewController = navigationController
         
-        let appVersion = 1.5// get app version
-        let currentVersion = 1.0 //cached version
+        // get app version
+        let currentAppVersion = getAppVersion()
         
-        if appVersion != currentVersion {
+        // get app cached version
+        let savedAppVersion = getSavedAppVersion() ?? "none"
+        
+        // check to see if there is a diff and if so clear cache
+        if savedAppVersion != currentAppVersion {
             EmployeeCacheService.shared.clear()
+            // save the current app version for next run
+            saveAppVersion(currentAppVersion)
         }
-                
+        
         // Set the window to the scene
         self.window = window
         window.makeKeyAndVisible()