删除角度边框UIButton ios swift

Question

如何在所示按钮的角度周围移除此白色边框？

Answer 1

以这种方式创建按钮：

let button = UIButton(type: UIButtonType.system)
button.titleLabel?.font = UIFont.preferredFont(forTextStyle: UIFontTextStyle.body)
button.setTitleColor(UIColor.black, for: UIControlState.normal)
button.backgroundColor = UIColor.white
button.layer.cornerRadius = 4