iOS项目开发实战(Swift)—Button和Alert学习

来源：互联网发布：arp检测软件编辑：程序博客网时间：2024/05/01 03:10

1.相关代码如下

iOS9.0中，苹果官方推荐使用UIAlertViewController取代之前UIAlertView，使用UIAlertView在Xcode7中会出现警告。

ViewController.swift代码如下：

import UIKitclass ViewController: UIViewController {        override func viewDidLoad() {        super.viewDidLoad()        let button1 = UIButton()        let button2 = UIButton()        button1.frame = CGRectMake(50, 50, 100, 30)        button1.setTitle("Alert", forState: UIControlState.Normal)        button1.backgroundColor = UIColor.blackColor()        button1.addTarget(self, action: "AlertClicked:", forControlEvents: UIControlEvents.TouchUpInside)        self.view.addSubview(button1)                button2.frame = CGRectMake(50, 100, 100, 30)        button2.setTitle("ActionSheet", forState: UIControlState.Normal)        button2.backgroundColor = UIColor.blackColor()        button2.addTarget(self, action: "ActionSheetClicked:", forControlEvents: UIControlEvents.TouchUpInside)        self.view.addSubview(button2)                    }    //UIAlertController和UIAlertAction的使用    func AlertClicked(sender: AnyObject){        let alertcontroller = UIAlertController(title: "Clicked", message: "我是Alert", preferredStyle: UIAlertControllerStyle.Alert)                let okAction = UIAlertAction(title: "确定", style: UIAlertActionStyle.Default, handler: nil)                let cancleAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)                //将action添加到视图控制器中        alertcontroller.addAction(okAction)        alertcontroller.addAction(cancleAction)        //最后要呈现出视图控制器，否则报错error:Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior        self.presentViewController(alertcontroller, animated: true, completion: nil)    }        func ActionSheetClicked(sender: AnyObject){        let alertcontroller = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)                let okAction = UIAlertAction(title: "拍照", style: UIAlertActionStyle.Default, handler: nil)                let selectAction = UIAlertAction(title: "从手机相册选择", style: UIAlertActionStyle.Default, handler: nil)                let cancleAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)                alertcontroller.addAction(okAction)        alertcontroller.addAction(selectAction)        alertcontroller.addAction(cancleAction)        //呈现出视图控制器        self.presentViewController(alertcontroller, animated: true, completion: nil)    }        override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }        }

2.command+R成功运行

点击Alert按钮之后，如下图:

点击ActionSheet按钮之后，如下图:(刚好看到微信修改头像是这种操作，所以做成这样)

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