Thank you everyone, I solved my problem.

[ytt123]

i am
macOS 10.13.6
"react-native": "0.56.1"

Share the steps I solved:

1. rm -rf node_modules/ && yarn cache clean && yarn add and rm -rf ~/.rncache
2. cd node_modules/react-native/scripts
3. ./ios-install-third-party.sh
   If your network is slow, you can download the packages separately and move them to the rncache folder
   1. folly-2016.10.31.00
   2. double-conversion-1.1.5
   3. glog-0.3.4
   4. boost_1_63_0
4. cd <Your-Project-Folder>/node_modules/react-native/third-party/glog-0.3.4
5. ./configure
6. Xcode Clean & Build

hope to help friends who have the same problem.

Originally posted by @lyon007 in #14382 (comment)

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