Read and write permission for user selected folder in Mac OS app?

Question

I am developing MAC OS app which have functionality to create file on the behalf of your. First user select folder for storing file (One time at start of app) and then user

Answer 1

I found the best and working answer here - reusing security scoped bookmark

Super simple, easy to understand and does the job pretty well.

The solution was :-

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)")
        }
    }
}