具有Radius的UIView和UIButton中的渐变颜色阴影

如何解决具有Radius的UIView和UIButton中的渐变颜色阴影

我从SO上尝试了很多方法，但是我无法制作以下类型的渐变阴影。

有人可以帮忙做这个吗？

我尝试了以下代码。

func addGradientShadowTomakeReservation() {
    
    let gradientLayer = CAGradientLayer()

    gradientLayer.colors = [
        UIColor(named: "GradiantColor1")!.cgColor,UIColor(named: "GradiantColor2")!.cgColor,UIColor(named: "GradiantColor2")!.cgColor
    ]

    gradientLayer.frame = CGRect(x: self.viewReservationGradiant.frame.minX - 40,y: self.viewReservationGradiant.frame.minY - 40,width: self.viewReservationGradiant.frame.width + 80,height: self.viewReservationGradiant.frame.height + 80)
    
    gradientLayer.masksToBounds = true
    
    let shadowLayer = CALayer()
    shadowLayer.frame = gradientLayer.bounds
    shadowLayer.shadowColor = UIColor.black.cgColor
    shadowLayer.shadowOpacity = 0.08
    shadowLayer.shadowRadius = 20
    shadowLayer.shadowPath = CGPath(rect: shadowLayer.bounds,transform: nil)
    
    gradientLayer.mask = shadowLayer
    
    self.viewReservationGradiant.clipsToBounds = false
    
    self.viewReservationGradiant.layer.addSublayer(gradientLayer)
}

但是它并没有按预期帮助我。