UserDefault 用户首选项读写 swift

//
// ViewController.swift
// 首选项数据读写
//
// Created by mac on 15/7/12.
// Copyright (c) 2015年 fangyuhao. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var btnSave: UIButton!
@IBOutlet weak var inputText: UITextView!
@IBOutlet weak var outputText: UITextView!
var ud:NSUserDefaults!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    ud = NSUserDefaults.standardUserDefaults()
    if let value:AnyObject = ud.objectForKey("data"){
        outputText.text = value as! String
    }else{
        outputText.text = "No value"
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func btnSaveClicked(sender: AnyObject) {
    ud.setObject(inputText.text, forKey: "data")
    println("saved")
}

}