本文介绍了UIImage作为CAShapeLayer的内容的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
如果我创建一个仅显示背景颜色的CAShapeLayer，但如果我将内容设置为图像，则不会显示任何内容。
If I create a CAShapeLayer with just a background color it shows up, but if i set the content to an image, nothing shows.
CAShapeLayer* leftDot = [CAShapeLayer layer];
leftDot.opacity = 1.0;
leftDot.frame = CGRectMake(leftRef.CGPointValue.x, leftRef.CGPointValue.y, 2 * radius, 2 * radius);
leftDot.position = CGPointMake(leftRef.CGPointValue.x + 4, leftRef.CGPointValue.y + 4);
leftDot.cornerRadius = radius;
[leftDot setContents:[UIImage imageNamed: @"glow.png"]];
[self.layer addSublayer: leftDot];
推荐答案
CAShapeLayer无法正常工作。您可以创建一个普通的CALayer，将图像作为其内容，然后使用形状图层作为该图层的蒙版，以达到您所追求的效果。
CAShapeLayer doesn't work that way. You would create a normal CALayer with the image as its content and then use the shape layer as the mask of that layer to achieve the effect you are after.
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