openFolder.swift

@IBAction func openFolderAction(sender: AnyObject) {
    let rpFilePicker:NSOpenPanel = NSOpenPanel()
    
    rpFilePicker.allowsMultipleSelection = false
    rpFilePicker.canChooseDirectories = true
    rpFilePicker.canChooseFiles = false
    
    rpFilePicker.runModal()
    
    let chosenFile = rpFilePicker.URL
}