NSView Layer Setup

In AppKit, always set wantsLayer = true before configuring any layer properties. Without it, layer properties are silently ignored.

// Good
let view = NSView()
view.wantsLayer = true
view.layer?.backgroundColor = NSColor.black.cgColor
view.layer?.cornerRadius = 8
view.layer?.masksToBounds = true

// Bad — cornerRadius silently ignored
let view = NSView()
view.layer?.cornerRadius = 8  // no effect

For NSTextField with cornerRadius, also set layer?.masksToBounds = true or the background won’t clip to the rounded corners.