https://www.mikegopsill.com/categories/debugging/ Recent content in Debugging on Mike Gopsill Hugo -- 0.157.0 en Fri, 16 May 2025 09:00:00 +0000 https://www.mikegopsill.com/posts/setnscolor-crash-uikit/ Fri, 16 May 2025 09:00:00 +0000 https://www.mikegopsill.com/posts/setnscolor-crash-uikit/ <h2 id="tldr">TL;DR</h2> <p>I recently encountered a crash on <code>SetNSColor(CGContext*, void const*)</code> with<br> <code>[__SwiftValue CGColor]: unrecognized selector sent to instance</code>. It took a while to find the root cause as the stack trace lacked a lot of detail. Ultimately it was a <strong>SwiftUI <code>Color</code></strong> in a <strong>UIKit</strong> API that expects a <code>UIColor</code> (or raw <code>CGColor</code>).</p> <p>In this case I passed a SwiftUI <code>Color</code> via the <code>.foregroundColor</code> attribute of an <code>NSAttributedString</code> that UIKit then rendered.</p>