自定义按钮无法轻按

默认情况下，在UIImageView实例中禁用用户交互。并且当超级视图的用户交互被禁用时，即使您设置了子视图，其子视图也无法接收用户交互button.isUserInteractiOnEnabled= true

因此，添加imageView.isUserInteractiOnEnabled= true在backgroundImageView关闭

let backgroundImageView: UIImageView = {
    let imageView = UIImageView()
    imageView.isUserInteractiOnEnabled= true
    imageView.translatesAutoresizingMaskIntoCOnstraints= false
    imageView.layer.masksToBounds = true
    return imageView
}()