swift – 重用安全范围的书签

在我的应用程序中,我想访问带有安全范围书签的本地文件目录.
如 App Sandbox Design Guide中所述,我将用户指定的文件夹(NSOpenPanel)存储在安全范围的书签中(作为NSData).

 但是,我发现Swift中不再提供URLByResolvingBookmarkData.

我不知道如何在重新启动应用程序后访问该URL并将权限授予我之前选择的目录.有任何想法吗？

/// OpenPanel and set the folderPath
var folderPath: NSURL? {
    didSet {
        do {
            let bookmark = try folderPath?.bookmarkDataWithOptions(.SecurityScopeAllowOnlyReadAccess, includingResourceValuesForKeys: nil, relativeToURL: nil)

        } catch  {
            print("Set bookMark fails")
        }
    }
}

我用NSUserDefaults想出来了.

var userDefault = NSUserDefaults.standardUserDefaults()
var folderPath: NSURL? {
    didSet {
        do {
            let bookmark = try folderPath?.bookmarkDataWithOptions(.SecurityScopeAllowOnlyReadAccess, includingResourceValuesForKeys: nil, relativeToURL: nil)
            userDefault.setObject(bookmark, forKey: "bookmark")
        } catch let error as NSError {
            print("Set Bookmark Fails: \(error.description)")
        }
    }
}

func applicationDidFinishLaunching(aNotification: NSNotification) {
    if let bookmarkData = userDefault.objectForKey("bookmark") as? NSData {
        do {
            let url = try NSURL.init(byResolvingBookmarkData: bookmarkData, options: .WithoutUI, relativeToURL: nil, bookmarkDataIsStale: nil)
            url.startAccessingSecurityScopedResource()
        } catch let error as NSError {
            print("Bookmark Access Fails: \(error.description)")
        }
    }
}