Swift:将 View 添加到窗口时不显示阴影

Question

我正在尝试为我的 customView 转换阴影，但它没有显示。使用 window?.addSubview(customView) 将此 customView 添加到窗口。

到目前为止的实现:

//CustomView setup
lazy var customView: UIView = {
    let v = UIView()
    v.translatesAutoresizingMaskIntoConstraints = false
    v.layer.cornerRadius = 8
    v.layer.shadowColor = UIColor.darkGray.cgColor
    v.layer.shadowOffset = CGSize(width: 0, height: 10)
    v.layer.shadowOpacity = 10.5
    v.layer.shadowRadius = 15.0
    v.layer.masksToBounds = true
    return v
}()

//Adding view to window
window?.addSubview(customView)

NSLayoutConstraint.activate([
    customView.leadingAnchor.constraint(equalTo: window!.leadingAnchor),
    customView.trailingAnchor.constraint(equalTo: window!.trailingAnchor),
    customView.heightAnchor.constraint(equalTo: window!.heightAnchor, multiplier: 1),
    customView.topAnchor.constraint(equalTo: window!.safeAreaLayoutGuide.bottomAnchor, constant: -100)
        ])

我听从了这个 post 的建议还有这个post , 但不知何故它不会显示添加到窗口的 View 。

Answer 1

是因为这一行:

v.layer.masksToBounds = true

如果你想要阴影和圆角，我建议使用两层，一层有阴影和masksToBounds = false，另一层是子层第一个并且有圆角 + masksToBounds = true