如何在Swift中绘制不带边框的矩形(MacOS)

import Cocoa

class MyView: NSView {
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        let path = NSBezierPath(rect: dirtyRect)
        NSColor.clear.setFill()
        path.fill()
    }
}

// 创建一个自定义的视图并将其添加到窗口中
let frame = NSRect(x: 0, y: 0, width: 200, height: 200)
let view = MyView(frame: frame)

let window = NSWindow(contentRect: frame, styleMask: [.titled, .closable, .miniaturizable, .resizable], backing: .buffered, defer: false)
window.contentView = view
window.makeKeyAndOrderFront(nil)

// 运行程序
NSApplication.shared.run()