个人还是更喜欢以前的UIAlertView的创建方法，更新后的UIAlertController虽然说将UIAlertView和UIActionSheet的功能和作用以一种模块化替换的方式来代替，但是却给人一种多此一举的感觉，原先一步到位变成了现在就连一个取消或者“OK”按钮都需要通过Add来添加才能实现，说是画蛇添足也不为过。
import UIKit
class ViewController: UIViewController {
var tapfun: UIButton!
override func viewDidLoad() {
self.tapfun = UIButton()
self.tapfun.frame = CGRectMake(50, 270, 200, 200)
self.tapfun.backgroundColor = UIColor.redColor()
self.tapfun.addTarget(self, action: "alert", forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(self.tapfun)
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
func alert(){
let alertView = UIAlertController(title: "123", message: "222", preferredStyle: UIAlertControllerStyle.Alert)
alertView.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alertView, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
原文：http://www.cnblogs.com/LeoMabi/p/5086999.html