Unfortunately it seems that setting the shadow attributes on the layer directly doesn't work:
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)
Setting the NSView.shadow property instead works:
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
But NSShadow doesn't support a custom path. What's the easiest way to set a shadow with a custom path?