swift 之actionSheet 使用

四步曲：

1、创建UIAlertController 警告控制器

2、创建UIAlertAction   警告行为

3、将 UIAlertAction 添加到 UIAlertController

4、present出UIAlertController 警告控制器

直接上代码

import UIKit

class ViewController: UIViewController {

  

  var controller:UIAlertController?

  

  override func viewDidLoad() {

    super.viewDidLoad()

    

    controller = UIAlertController(

      title: "Choose how you would like to share this photo",

      message: "You cannot bring back a deleted photo",

      preferredStyle: .ActionSheet)

    

    let actionEmail = UIAlertAction(title: "Via email",

      style: UIAlertActionStyle.Default,

      handler: {(paramAction:UIAlertAction!) in

        /* Send the photo via email */

      })

    

    let actionImessage = UIAlertAction(title: "Via iMessage",

      style: UIAlertActionStyle.Default,

      handler: {(paramAction:UIAlertAction!) in

        /* Send the photo via iMessage */

      })

    

    let actionDelete = UIAlertAction(title: "Delete photo",

      style: UIAlertActionStyle.Destructive,

      handler: {(paramAction:UIAlertAction!) in

        /* Delete the photo here */

      })

    

    controller!.addAction(actionEmail)

    controller!.addAction(actionImessage)

    controller!.addAction(actionDelete)

    

  }

  

  override func viewDidAppear(animated: Bool) {

    super.viewDidAppear(animated)

    self.presentViewController(controller!, animated: true, completion: nil)

  }

  

}