swift3.0 渐变色

class ViewController: UIViewController {
    
    private var gradientLayer:CAGradientLayer = CAGradientLayer()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.gradientLayer.frame = self.view.bounds
        
        self.gradientLayer.colors = [UIColor .clear.cgColor,UIColor.black.cgColor]
        
        self.gradientLayer.opacity = 1
        
        gradientLayer.locations = [0,1]
        
        gradientLayer.startPoint = CGPoint(x: 0,y: 0.5)
        
        gradientLayer.endPoint = CGPoint(x: 1,y: 0.5)
        
        view.layer.addSublayer(self.gradientLayer)
        
    }
    
    
    
}

var gradientLayer2 = CAGradientLayer()
        gradientLayer2.startPoint = CGPointMake(0.5,1.0)
        gradientLayer2.endPoint = CGPointMake(0.5,0.0)
        gradientLayer2.frame = CGRectMake(0,bounds.size.width,bounds.size.height)
        gradientLayer2.colors = [UIColor.yellowColor().CGColor,UIColor.blueColor().CGColor,UIColor.greenColor().CGColor]
        self.view.layer.addSublayer(gradientLayer2)

（编辑：李大同）

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