make it work

Mac/Components/Preferences/CoverArtPrefsController.swift

@@ -18,6 +18,16 @@ class CoverArtPrefsController: NSViewController {
     } else {
       fetchMissingArtworkFromInternet.state = .off
     }
+    
+    if App.store.state.preferencesState.fetchArtworkFromCustomURL {
+      customArtworkURLButton.state = .on
+    } else {
+      customArtworkURLButton.state = .off
+    }
+    
+    if let urlString = App.store.state.preferencesState.customArtworkURL?.absoluteString {
+        customArtworkURLTextField.stringValue = urlString
+    }
 
     preferredContentSize = NSMakeSize(view.frame.size.width, view.frame.size.height)
   }
@@ -43,6 +53,12 @@ class CoverArtPrefsController: NSViewController {
         UpdateCustomArtworkURLToggle(useCustomArtworkURL: sender.state == .on)
     )
   }
+    
+  @IBAction func updateCustomArtworkURL(_ sender: NSTextField) {
+    App.store.dispatch(
+        UpdateCustomArtworkURL(customArtworkURL: sender.stringValue)
+    )
+  }
 
   @IBAction func clearAlbumArtCache(_ sender: NSButton) {
     KingfisherManager.shared.cache.clearDiskCache()

Mac/Components/Window/Base.lproj/Main.storyboard

@@ -580,6 +580,9 @@
                                                 <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
                                                 <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
                                             </textFieldCell>
+                                            <connections>
+                                                <action selector="updateCustomArtworkURL:" target="3C9-vU-zjZ" id="I5e-oc-cN6"/>
+                                            </connections>
                                         </textField>
                                     </gridCell>
                                     <gridCell row="g4x-Bc-qT7" column="y6E-R8-zfP" id="LTx-vQ-fTR">

Shared/State/Actions/PreferencesActions.swift

@@ -24,4 +24,8 @@ struct UpdateCustomArtworkURLToggle: Action {
   var useCustomArtworkURL: Bool
 }
 
+struct UpdateCustomArtworkURL: Action {
+  var customArtworkURL: String
+}
+
 struct SavePreferences: Action {}

Shared/State/Reducers/PreferencesReducer.swift

@@ -22,6 +22,9 @@ func preferencesReducer(action: Action, state: PreferencesState?) -> Preferences
   
   case let action as UpdateCustomArtworkURLToggle:
     state.fetchArtworkFromCustomURL = action.useCustomArtworkURL
+    
+  case let action as UpdateCustomArtworkURL:
+    state.customArtworkURL = URL(string: action.customArtworkURL)
 
   case is SavePreferences:
     state.save()