ios - 用 CAShapeLayer 添加阴影？
<p><p>我有一个只有底部圆角的<code>CAShapeLayer</code>。我想要的是在底部添加一个阴影，但它不起作用，即使代码看起来显然是正确的。它所做的一切都是围绕底角，但我没有看到阴影。</p>
<pre><code>let shapeLayer = CAShapeLayer()
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: CGSize(width: 20, height: 20)).cgPath
shapeLayer.path = path
shapeLayer.shadowColor = UIColor(r: 233, g: 233, b: 233).cgColor
shapeLayer.shadowOffset = CGSize(width: 0.0, height: 2.8)
shapeLayer.shadowOpacity = 1.0
shapeLayer.shadowRadius = 0.0
shapeLayer.shouldRasterize = true
shapeLayer.rasterizationScale = UIScreen.main.scale
layer.rasterizationScale = UIScreen.main.scale
layer.mask = shapeLayer
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p><code>shapeLayer</code> 将 View 的角变圆，因为它被设置为层的 mask 。您可能希望将其添加为子层。</p>
<p><strong>旧:</strong></p>
<pre><code>layer.mask = shapeLayer
</code></pre>
<p><strong>新:</strong></p>
<pre><code>layer.addSublayer(shapeLayer)
</code></pre>
<p>如果有帮助，我在这里写了另一个关于向圆角 View 添加阴影的答案:<a href="https://stackoverflow.com/a/41475658/6658553" rel="noreferrer noopener nofollow">https://stackoverflow.com/a/41475658/6658553</a> </p></p>
<p style="font-size: 20px;">关于ios - 用 CAShapeLayer 添加阴影？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/43791102/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/43791102/
</a>
</p>
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