var sheet = UIActionSheet(title: nil, delegate: self, cancelButtonTitle: nil, destructiveButtonTitle: nil)

            sheet.addButton(withTitle: "按键学习")

            sheet.addButton(withTitle: "扫码学习")

            sheet.addButton(withTitle: "取消")

            sheet.cancelButtonIndex = 2

            sheet.show(in: self.view)

 

实现UIActionSheetDelegate

func actionSheet(_ actionSheet: UIActionSheet, clickedButtonAt buttonIndex: Int) {

         print(buttonIndex)

    }

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