Question

我正在尝试将阴影投射到我的customView上，但未显示。使用window?.addSubview(customView)将此customView添加到窗口中。

到目前为止的实施：

//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)
        ])

我已经遵循了这个post和这个post的建议，但是对于添加到窗口中的视图，它却不会出现。有什么建议吗？谢谢。

Answer 1

是因为这一行：

v.layer.masksToBounds = true

如果想要阴影和圆角倒圆，我建议使用两层，一层具有阴影和masksToBounds = false，另一层是第一层的子层并具有圆角+ masksToBounds = true

Answer 2

设置v.clipsToBounds = true和之后，然后设置v.layer.masksToBounds = false

您的UIView应该如下所示：

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.clipsToBounds = true
    v.layer.masksToBounds = false
    return v
}()

注意：有customView和commentView，请确保您使用的是正确的

。

Swift：将视图添加到窗口时不显示阴影

2 个答案: