[Swift]UIKit学习之警告框:UIAlertController和UIAlertView

概述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 o

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.swiftimportUIKitclassVIEwController:UIVIEwController{overrIDefuncvIEwDIDLoad(){super.vIEwDIDLoad()//DoanyadditionalsetupafterloadingthevIEw,typicallyfromanib.//创建一个buttonletbutton=UIbutton(type:UIbuttonType.Custom)//初始化UIbuttonbutton.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d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)}//Actionfuncbuttonpressed(sender:UIbutton){showAlertreset()}funcshowAlertDefault(){letalertController=UIAlertController(Title:"d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:"d窗的标题",showAlertreset",preferredStyle:UIAlertControllerStyle.Alert)letcancelAction=UIAlertAction(Title:"取消 *** 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

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