如何在UIActionSheet中自定义按钮？

let actionSheet = UIActionSheet(title: "自定义按钮", delegate: self, cancelButtonTitle: "取消", destructiveButtonTitle: nil, otherButtonTitles: "按钮1", "按钮2", "按钮3")

actionSheet.actionSheetStyle = .default

actionSheet.setTitle("自定义按钮", forButtonAt: 0)
actionSheet.setTitleColor(.red, for: .normal)

func actionSheet(_ actionSheet: UIActionSheet, clickedButtonAt buttonIndex: Int) {
    switch buttonIndex {
    case 0:
        print("点击了按钮1")
    case 1:
        print("点击了按钮2")
    case 2:
        print("点击了按钮3")
    default:
        break
    }
}

actionSheet.show(in: self.view)