building for iOS Simulator, but linking in object file built for iOS

Xcode升级到12.x后，运行低版本RN项目到模拟器中时出现以下报错

building for iOS Simulator, but linking in object file built for iOS

用到其中的解决方案：

第一步

VALID_ARCHS 加上 x86_64

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第二步

Excluded Architecture 加上 arm64
Build Active Architecture Only 设置为 NO

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注意：真机运行和打包时，要去掉VALID_ARCHS中的x86_64和Excluded Architecture中的arm64

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（原文链接：https://www.jianshu.com/p/55d290a204e7）