我写的UIButton的点击事情为啥会报错啊求教？

Question

//删除按钮

    deleteButton = UIButton(frame: CGRect(x: 290, y: 80, width: 30, height: 20))
    deleteButton.setTitle("X", for: .normal)
    deleteButton.setTitle("Y", for: .selected)
    deleteButton.backgroundColor = UIColor.lightGray

    deleteButton.addTarget(self, action: #selector(deleteButtonClick), for: .touchUpInside)
    
    

提示错误：Use of unresolved identifier 'deleteButtonClick'

不写点击事件就可以运行

Answer 1

没有实现这个按钮的点击事件

@objc func deleteButtonClick() {
      /**
       *  To Do Some Thing ...
       */
}