使用UIAlertController彈出消息框

//
//  ViewController.swift
//  HelloWord
//
//  Created by QHS8848 on 15/9/29.
//  Copyright © 2015年 QHS8848. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        //設置背景色爲白色
        self.view.backgroundColor = UIColor.whiteColor()
    }

    @IBAction func buttonClick1(sender: UIButton) {
        
        //alertController--Alert模式
        let alertController = UIAlertController(title: "AlertController", message: "使用UIAlertController來作提示對話框的測試", preferredStyle:.Alert)
        
        //OK按鈕的代碼塊，這裏點擊Ok按鈕之後，再次彈出一個新的Alert
        let okActionHandler = {(action:UIAlertAction!)->Void in
            let alertMessage = UIAlertController(title: "AlertAction", message: "你點擊的是Ok按鈕", preferredStyle: .Alert)
            alertMessage.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
            self.presentViewController(alertMessage, animated: true, completion: nil)
        }
        
        //OKButton
        let okAction = UIAlertAction(title: "OK", style: .Default, handler: okActionHandler)
        
        //Cancel按鈕的事件處理代碼塊
        let cancelActionHander = {(action:UIAlertAction!) -> Void in
            NSLog(" Cancel Button")
        }

        //CancelButton
        let cancelAction = UIAlertAction(title: "Cancel", style: .Default, handler: cancelActionHander)
        
        //將UIAlertAction添加到UIAlertController上面
        alertController.addAction(okAction)
        alertController.addAction(cancelAction)
        
        //顯示
        presentViewController(alertController, animated: true, completion: nil)
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}