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Asked: 2026-06-02T19:46:51+00:00

I’m making a marching ants selection frame with Core Animation Layers like in this

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I’m making a “marching ants” selection frame with Core Animation Layers like in this post: MARCHING ANTS WITH CORE ANIMATION.
But the only thing I don’t like is the width of line in CAShapeLayer. I need the width to be exactly 1px, but because of antialiasing the line width is about 2 pixels and a little transparent.

Is there any way to turn off antialiasing?

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1 Answer

  1. Editorial Team

    Based on the docs, it looks like you’re stuck with antialising:

    The CAShapeLayer class draws a cubic Bezier spline in its coordinate
    space. The shape is composited between the layer’s contents and its
    first sublayer.

    The shape will be drawn antialiased, and whenever possible it will be
    mapped into screen space before being rasterized to preserve
    resolution independence. However, certain kinds of image processing
    operations, such as CoreImage filters, applied to the layer or its
    ancestors may force rasterization in a local coordinate space.

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