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The iOS card always drew a hairline separator, so an app that wants a card outlined in its accent colour had to wrap the card or fork the widget. Both parameters are optional and default to today's rendering. Setting borderColor without a width bumps the hairline to 1.0, so a deliberate colour is actually visible; Android is unchanged, where the border comes from shape.
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The iOS card always draws a hairline separator around itself. An app that wants its cards outlined in the accent colour — a common way to make a card read as tappable or selected — has to wrap the card in another
Containeror fork the widget. We had forked it.Two optional parameters, both defaulting to today's rendering:
Setting
borderColorwithout a width bumps the hairline from 0.5 to 1.0 — at half a point a deliberate colour barely shows, which surprised us when we first tried it. PassingborderWidthexplicitly always wins.Android is untouched: there the border comes from
shape, as before.Demo
card_demo_pagegains a "Custom Border (iOS)" section with both cases, right above the existing "Custom Colors".Testing
flutter analyzeclean for package and example, built and run on an iPhone 17 Pro simulator (iOS 26.2) — screenshot of the new section available if useful.