您是否已取消选中并行化构建选项并在构建目标中首先列出React？

Do you have Parallelize build option unchecked and React listed first in your build targets?

您可以在Xcode中找到此窗口=>运行按钮附近的项目图标=>编辑方案=>构建选项卡

You can find this window in Xcode => Your project icon near the run button => Edit scheme => Build tab