Important:UIAlertViewis deprecated in iOS 8. (Note thatUIAlertViewDelegateis also deprecated.) To create and manage alerts in iOS 8 and later,instead useUIAlertControllerwith apreferredStyleofUIAlertControllerStyleAlert.

‍‍在Xcode7中使用UIAlertView会报如下警告:

'UIAlertView'wasdeprecated iniOS9.0: UIAlertViewisdeprecated. UseUIAlertControllerwith apreferredStyleof UIAlertControllerStyleAlert instead‍‍

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

UIAlertController同时替代了UIAlertView和UIActionSheet，从系统层级上统一了 alert 的概念 —— 即以 modal 方式或 popover 方式展示。

//ViewController.swift

importUIKit

classViewController:UIViewController{

overridefuncviewDidLoad(){
super.viewDidLoad()
//Doanyadditionalsetupafterloadingtheview,typicallyfromanib.

//创建一个Button
letbutton=UIButton(type:UIButtonType.Custom)//初始化UIButton
button.frame=CGRectMake(50,100,150,50)//创建一个CGRect,设置位置和大小
button.backgroundColor=UIColor.greenColor()//设置背景色
button.setTitle("点击显示弹窗",forState:UIControlState.Normal)//设置标题
//传递触摸对象(点击事件)
button.addTarget(self,action:"buttonPressed:",forControlEvents:UIControlEvents.TouchUpInside)
self.view.addSubview(button)

}

//Action
funcbuttonPressed(sender:UIButton){

showAlertReset()

}

funcshowAlertDefault(){
letalertController=UIAlertController(title:"弹窗标题",message:"Hello,这个是UIAlertController的默认样式",preferredStyle:UIAlertControllerStyle.Alert)

letcancelAction=UIAlertAction(title:"取消",style:UIAlertActionStyle.Cancel,handler:nil)
letokAction=UIAlertAction(title:"好的",style:UIAlertActionStyle.Default,handler:nil)
letresetAction=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)
}

funcshowAlertReset(){
letalertControl=UIAlertController(title:"弹窗的标题",showAlertReset",preferredStyle:UIAlertControllerStyle.Alert)
letcancelAction=UIAlertAction(title:"取消操作",handler:nil)
alertControl.addAction(cancelAction)
alertControl.addAction(okAction)
self.presentViewController(alertControl,completion:nil)
}

overridefuncdidReceiveMemoryWarning(){
super.didReceiveMemoryWarning()
//DispoSEOfanyresourcesthatcanberecreated.
}


}

参考：

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

http://www.jb51.cc/article/p-dhtbmglj-bgr.html