Xcode’s UI testing requires that the target app uses on-screen controls that are visible to iOS’s accessibility infrastructure. I believe React Native uses native controls, which clearly are visible to accessibility, and thus you shouldn’t have problems with this. However, I’m not a React Native expert, so I think it’d be best if you either prototyped this for yourself or raised the issue via the support for that framework.
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
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WWDC runs Mon, 4 Jun through to Fri, 8 Jun. During that time all of DTS will be at the conference, helping folks out face-to-face.