在 NSView 上使用自定义影子路径-解网

问：

不幸的是，直接在图层上设置阴影属性似乎不起作用：

let shadowView = NSView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
shadowView.wantsLayer = true
shadowView.layer!.backgroundColor = .white
shadowView.layer!.shadowRadius = 50
shadowView.layer!.shadowColor = .black
shadowView.layer!.shadowOffset = CGSize(width: 0, height: -30)
shadowView.layer!.shadowPath = CGPath(roundedRect: shadowView.bounds, cornerWidth: 25, cornerHeight: 25, transform: nil)

设置 NSView.shadow 属性会起作用：

let shadowView = NSView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))let shadow = NSShadow()
shadow.shadowBlurRadius = 50
shadow.shadowColor = .black
shadow.shadowOffset = CGSize(width: 0, height: -30)
shadowView.shadow = shadow
shadowView.wantsLayer = true
shadowView.layer!.backgroundColor = .white

但不支持自定义路径。使用自定义路径设置阴影的最简单方法是什么？NSShadow

可可 Calayer NSview查看

class ViewController: NSViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let shadowView = NSView(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
        view.addSubview(shadowView)
        
        shadowView.wantsLayer = true
        
        shadowView.layer!.backgroundColor = .white
        shadowView.layer!.shadowRadius = 50
        shadowView.layer!.shadowColor = .black
        shadowView.layer!.shadowOffset = CGSize(width: 0, height: -30)
        shadowView.layer!.shadowPath = CGPath(roundedRect: shadowView.bounds, cornerWidth: 25, cornerHeight: 25, transform: nil)
        
        // need these two properties set
        shadowView.layer!.masksToBounds = false
        shadowView.layer!.shadowOpacity = 1.0  // set as desired
        
    }
    
}

结果：

在 NSView 上使用自定义影子路径

Using custom shadow path on NSView

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