Issue #3: Added Settings class to store selected BlocklistOption. Update system DoH settings, when user selects another blocklist.

dns/Settings.swift

@@ -0,0 +1,24 @@
+//
+//  Settings.swift
+//  dns
+//
+//  Created by Benjamin Erhart on 15.04.26.
+//
+
+import Foundation
+
+class Settings {
+
+    private static let blocklistKey = "blocklist"
+
+    private static let defaults = UserDefaults.standard
+
+    class var blocklist: BlocklistOption {
+        get {
+            BlocklistOption(rawValue: defaults.string(forKey: blocklistKey) ?? BlocklistOption.secure.rawValue) ?? .secure
+        }
+        set {
+            defaults.set(newValue.rawValue, forKey: blocklistKey)
+        }
+    }
+}

dns/ViewModel.swift

@@ -12,21 +12,19 @@ import OSLog
 
 class ViewModel: NSObject, ObservableObject {
 
-    // TODO: Store this in UserDefaults
     @Published
-    var blocklist: BlocklistOption = .secure
+    var blocklist: BlocklistOption = .secure {
+        didSet {
+            Settings.blocklist = blocklist
+
+            toggleDns()
+        }
+    }
 
-    // TODO: Store this in UserDefaults
     @Published
     var isDnsEnabled = false {
         didSet {
-            if !isProgrammaticChange {
+            toggleDns()
-                toggleDns()
-            }
-            else {
-                // Reset, so next one is recognized as coming from the user again.
-                isProgrammaticChange = false
-            }
         }
     }
 
@@ -39,6 +37,13 @@ class ViewModel: NSObject, ObservableObject {
 
 
     func toggleDns() {
+        guard !isProgrammaticChange else {
+            // Reset, so next one is recognized as coming from the user again.
+            isProgrammaticChange = false
+
+            return
+        }
+
         Task {
             if isDnsEnabled {
                 manager.dnsSettings = blocklist.settings