1. issue

Multiple commands produce '/Users/momo/Library/Developer/Xcode/DerivedData/wellgrower-btcmzmhbolyjgxcjmwpakjebvvxs/Build/Products/Debug-iphonesimulator/wellgrower.app/AntDesign.ttf':

react-native-vector-icons ios 설정을 할 때 xcode와 vscode에 두 군데에 Fonts폴더를 만들어 발생한 오류인 듯하다.

2. solution

https://stackoverflow.com/questions/50718018/xcode-10-error-multiple-commands-produce에 나온대로 다음 과정을 따라하니 해결되었다.

1) Target -> 2)Build Phases 2) Copy Bundle Resources (n items) 3) Remove Copy File.