渐变色

import Cocoa

class BackUpFirstSetVC: NSViewController {

    @IBOutlet weak var topView: NSBox!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do view setup here.
        let gradLayer = CAGradientLayer.init()
        gradLayer.startPoint = CGPoint.init(x: 0.5, y: 0.68)
        gradLayer.endPoint = CGPoint.init(x: 0.5, y: 0.11)
        gradLayer.colors = [NSColor.init(hexColorString: "D8D8D8").cgColor,NSColor.init(hexColorString: "EEEEEE").cgColor]
        gradLayer.locations = [0,1]
        topView.wantsLayer = true
        topView.layer = gradLayer
        view.wantsLayer = true
        view.layer?.backgroundColor = NSColor.white.cgColor
        
        
        
    }
    
}