Added 'Save Artwork' toolbar button

TagTunes/Preferences.swift

@@ -30,12 +30,12 @@ import Cocoa
     
         static let saveArtworkKey = "Save Artwork"
         
+        static let artworkTargetKey = "Artwork Target"
+        
         static let keepSearchResultsKey = "Keep Search Results"
         
         static let removeSavedAlbumsKey = "Remove Saved Albums"
         
-        static let artworkTargetKey = "Artwork Target"
-        
         static let useCensoredNamesKey = "Use Censored Names"
         
         static let caseSensitive = "Case Sensitive"
@@ -43,6 +43,7 @@ import Cocoa
         static let tagSavingBehaviorsKey = "Tag Saving Behaviors"
     }
     
+    /// Specifies the way a tag is saved to iTunes.
     public enum TagSavingBehavior: String {
         
         /// Sets the tag's value to the value returned from the Search API.
@@ -79,10 +80,7 @@ import Cocoa
             }
             tagSavingBehaviors = savingBehaviors
         }
-        let initialArtworkFolder = NSURL.fileURLWithPath(NSFileManager.defaultManager().URLsForDirectory(.DownloadsDirectory, inDomains: .UserDomainMask)[0].filePathURL!.path!, isDirectory: true)
-        if NSUserDefaults.standardUserDefaults().URLForKey(UserDefaultsConstants.artworkTargetKey) == nil {
-            artworkTarget = initialArtworkFolder
-        }
+        artworkTarget = nil
     }
     
     // MARK: General Preferences
@@ -101,12 +99,12 @@ import Cocoa
     /// The URL of the folder album artwork is saved to.
     ///
     /// The URL must be a valid file URL pointing to a directory.
-    public dynamic var artworkTarget: NSURL {
+    public dynamic var artworkTarget: NSURL? {
         set {
             NSUserDefaults.standardUserDefaults().setURL(newValue, forKey: UserDefaultsConstants.artworkTargetKey)
         }
         get {
-            return NSUserDefaults.standardUserDefaults().URLForKey(UserDefaultsConstants.artworkTargetKey)!
+            return NSUserDefaults.standardUserDefaults().URLForKey(UserDefaultsConstants.artworkTargetKey)
         }
     }