ios - CAShapeLayer 中的多个路径

Question

我想知道是否有可能让 CAShapeLayer 描边不止一条路径，因为实际上它只需要一条路径作为参数，例如:

CAShapeLayer* myLayer=[CAShapeLayer layer];
myLayer.path=myBezierPath

但是如果我想在该图层上绘制不止一条路径怎么办？

Answer 1

使用

void CGPathAddPath (
  CGMutablePathRef path1,     // The mutable path to change.
  const CGAffineTransform *m, // A pointer to an affine transformation matrix, or NULL if no transformation is needed. If specified, Quartz applies the transformation to path2 before it is added to path1.
  CGPathRef path2             // The path to add.
);

代码示例:

CGMutablePathRef combinedPath = CGPathCreateMutableCopy(path.CGPath);
CGPathAddPath(combinedPath, NULL, path2.CGPath);
CGPathAddPath(combinedPath, NULL, path3.CGPath);
CGPathAddPath(combinedPath, NULL, path4.CGPath);
myLayer.path = combinedPath;