内阴影路径斯威夫特2

Question

我无法在Swift中找到内部阴影方法。

这是我试图重新创建的图片：

所以，我创建了一个let shadowPath = UIBezierPath(arcCenter: CGPoint(x: viewRect.maxX-(viewRect.height/2),y: viewRect.height/2), radius: (frame.size.height-6)/2.0, startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true).CGPath let shadowLayer = CAShapeLayer() shadowLayer.fillColor = UIColor.clearColor.CGColor shadowLayer.shadowPath = shadowPath shadowLayer.path = shadowPath shadowLayer.shadowRadius = 6 shadowLayer.shadowOpacity = 1 shadowLayer.shadowColor = UIColor(white: 0, alpha: 1).CGColor shadowLayer.shadowOffset = CGSizeZero 和添加阴影，但它不起作用。

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