Swift 按钮阴影

Question

我有两个简单的按钮，都有阴影，并且都对这些阴影使用相同的参数。是否可以将这些参数合并在一起？感觉这样控制起来会简单很多...

这些是按钮：

@IBOutlet weak var locationButton: UIButton!
@IBOutlet weak var infoButton: UIButton!

这是影子的代码：

    locationButton.layer.shadowColor = UIColor.black.cgColor
    locationButton.layer.shadowOffset = CGSize(width: -1, height: 2)
    locationButton.layer.shadowRadius = 1.8
    locationButton.layer.shadowOpacity = 0.3

    infoButton.layer.shadowColor = UIColor.black.cgColor
    infoButton.layer.shadowOffset = CGSize(width: -1, height: 2)
    infoButton.layer.shadowRadius = 1.8
    infoButton.layer.shadowOpacity = 0.3

再一次，代码运行没有任何问题，我只是想减少同时控制两层的行数。谢谢！

Answer 1

添加扩展

extension UIView {
  func addShadow() {
    self.layer.shadowColor = UIColor.black.cgColor
    self.layer.shadowOffset = CGSize(width: -1, height: 2)
    self.layer.shadowRadius = 1.8
    self.layer.shadowOpacity = 0.3
  }
}

然后调用它

locationButton.addShadow()

您还可以创建一个 UIButton 子类

Swift 按钮阴影

Swift button shadows

xcode

button

layer

shadow

swift