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A few subpaths are added to a mutable graphics path:
CGPathAddPath(path, NULL, subpath1);
// ...
CGPathAddPath(path, NULL, subpath2);
// ...
CGPathAddPath(path, NULL, subpath3);
How can I remove some/all subpaths from path?
You can’t, you are responsable to keep the data required to redraw the path (or part of it) if needed (you basically have to create a new path containing only the subpaths you want to keep).