[Swift]UIKit學習之警告框:UIAlertController和UIAlertView

Important: UIAlertView is deprecated in iOS 8. (Note that UIAlertViewDelegate is also deprecated.) To create and manage alerts in iOS 8 and later, instead use UIAlertController with a preferredStyle ofUIAlertControllerStyleAlert.

‍‍在Xcode7中使用UIAlertView會報以下警告: 

'UIAlertView' was deprecated in iOS 9.0: UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead‍‍

Alert Views ： Alert views display a concise and informative alert message to the user.

UIAlertController 同時替代了 UIAlertView 和 UIActionSheet，從系統層級上統一了 alert 的概念 —— 即以 modal 方式或 popover 方式展現。 

//  ViewController.swift

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        //建立一個Button
        let button = UIButton(type: UIButtonType.Custom) //初始化UIButton
        button.frame = CGRectMake(50, 100, 150, 50) //建立一個CGRect, 設置位置和大小
        button.backgroundColor = UIColor.greenColor() //設置背景色
        button.setTitle("點擊顯示彈窗", forState: UIControlState.Normal) //設置標題
        //傳遞觸摸對象(點擊事件)
        button.addTarget(self, action: "buttonPressed:", forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(button)
        
    }

    // Action
    func buttonPressed(sender: UIButton) {

        showAlertReset()
   
    }
    
    func showAlertDefault(){
        let alertController = UIAlertController(title: "彈窗標題", message: "Hello, 這個是UIAlertController的默認樣式", preferredStyle: UIAlertControllerStyle.Alert)
        
        let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
        let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default, handler: nil)
        let resetAction = UIAlertAction(title: "重置", style: UIAlertActionStyle.Destructive, handler: nil)
        
        alertController.addAction(resetAction)
        
        alertController.addAction(cancelAction)
        alertController.addAction(okAction)
        
        self.presentViewController(alertController, animated: true, completion: nil)
    }
    
    func showAlertReset(){
        let alertControl = UIAlertController(title: "彈窗的標題", message: "Hello,showAlertReset ", preferredStyle: UIAlertControllerStyle.Alert)
        let cancelAction = UIAlertAction(title: "取消操做", style: UIAlertActionStyle.Destructive, handler: nil)
        let okAction     = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default, handler: nil)
        alertControl.addAction(cancelAction)
        alertControl.addAction(okAction)
        self.presentViewController(alertControl, animated: true, completion: nil)
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

參考：

http://www.jianshu.com/p/86f933850df8

http://blog.csdn.net/xiaowenwen1010/article/details/40108097