Swift - 操作表（UIActionSheel）的用法，也叫底部警告框

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class ViewController: UIViewController,UIActionSheetDelegate {

    override func viewDidLoad() {

        super.viewDidLoad()

        var actionSheet=UIActionSheet()

        //actionSheet.title = "请选择操作"

        actionSheet.addButtonWithTitle("取消")

        actionSheet.addButtonWithTitle("动作1")

        actionSheet.addButtonWithTitle("动作2")

        actionSheet.cancelButtonIndex=0

        actionSheet.delegate=self

        actionSheet.showInView(self.view);

    }

    func actionSheet(actionSheet: UIActionSheet!,clickedButtonAtIndex buttonIndex:Int){

            println("点击了："+actionSheet.buttonTitleAtIndex(buttonIndex))

    }

}

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actionSheet.showInView(self.view);  //一般情况

actionSheet.showFromToolbar(self.navigationController.toolbar)  //工具条的情况下

actionSheet.showFromTabBar(self.tabBar)  //标签条的情况下