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class ViewController: UIViewController {
 
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        let str = "Test Message"
        let url = self.getDocumentsDirectory().appendingPathComponent("message.txt")
        
        do {
            try str.write(to: url, atomically: true, encoding: .utf8)
        } catch {
            print(error.localizedDescription)
        }
 
    }
 
    func getDocumentsDirectory() -> URL {
        // find all possible documents directories for this user
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        
        // just send back the first one, which ought to be the only one
        return paths[0]
    }
    
}