Regarding http://indiestack.com/2017/06/evergreen-images/

AppDelegate.swift

// Regarding http://indiestack.com/2017/06/evergreen-images/
// Could evergreenImage() be rewritten like this?

private func evergreenImage() -> NSImage {
    let imageSize = NSSize(width: 64, height: 64)
    let image = NSImage.init(size: imageSize, flipped: false) { (rect) -> Bool in
        let fontAttributes = [NSFontAttributeName: NSFont.systemFont(ofSize: 60)]
        NSString(string: "🌲").draw(in: rect, withAttributes: fontAttributes)
        return true
    }
    image.setName("NSApplicationIcon")
    return image
}

func applicationDidFinishLaunching(_ note: Notification) {
    NSApplication.shared().applicationIconImage = evergreenImage()
  
    // Rest of applicationDidFinishLaunching() goes here...
}