Is this a bug report?

no

Have you read the Bugs section of the How to Contribute guide?

yes

Environment

1. react-native -v:react-native: 0.46.4
2. node -v:v8.1.0
3. npm -v:none
4. yarn --version:0.24.6

• Target Platform:iOS

• Development Operating System:MacOs

• Build tools:Xcode

Steps to Reproduce

1.open the xcode
2.click the run button

then the xcode report that:
Users/zty/Library/Developer/Xcode/DerivedData/iMetric-efzaxfdglbsyddhglsclbqijircq/Build/Intermediates/iMetric.build/Release-iphonesimulator/iMetric.build/Script-00DD1BFF1BD5951E006B06BC.sh: line 3: ../node_modules/react-native/packager/react-native-xcode.sh: No such file or directory