低于错误，
Analyzing dependencies
Fetching podspec for `DoubleConversion` from `../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec`
Pre-downloading: `ExpoKit` from `http://github.com/expo/expo.git`, tag `ios/2.13.0`
Fetching podspec for `Folly` from `../node_modules/react-native/third-party-podspecs/Folly.podspec`
Fetching podspec for `glog` from `../node_modules/react-native/third-party-podspecs/glog.podspec`
[!] Unable to find a specification for `React-Core` depended upon by `UMReactNativeAdapter`
You have either:
* out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.
* mistyped the name or version.
* not added the source repo that hosts the Podspec to your Podfile.
我试过，
pod setup
pod install
pod install --repo-update
另外，我卸载/安装了
cocoapods再次，但仍然出现上述错误。
最佳答案
您可以更改您的 UMReactNativeAdapter podspec 文件，
s.dependency 'React-Core'
看看这个类似的问题。
https://github.com/joltup/rn-fetch-blob/issues/402#issuecomment-513077800
关于xcode - 无法找到 `React-Core` 依赖的规范 `UMReactNativeAdapter`，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60846443/