This repo reproduces a NativeScript issue (GIF on the left) where you need to scroll a ListView item out of view (and back in) to see the updated background color.
The "fix" branch (GIF on the right) suggests a fix that works for me but may not be the best solution.
git clone https://github.com/EddyVerbruggen/nativescript-listview-backgroundcolor-changedetection-issue
cd nativescript-listview-backgroundcolor-changedetection-issue
tns run ios(I've checked in node_modules on purpose since that's where the problem/fix is)