Unable to find a specification for `React-Core` depended upon by `RNCPicker` 1.6.0 with React Native 0.59

Question

I was getting this error when running pod install for RNCPicker of version 1.6.0 with React Native 0.59

Analyzing dependencies
[!] Unable to find a specification for `React-Core` depended upon by `RNCPicker`

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 * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.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.

In my case I have to use these specific versions. How do I get rid of this error?

Answer 1

React-Core is outdated and has been renamed to React

I have added the following lines to the bottom of my Podfile under ios.

def change_lines_in_file(file_path, &change)
  print "Fixing #{file_path}...\n"
  
  contents = []
  
  file = File.open(file_path, 'r')
  file.each_line do | line |
    contents << line
  end
  file.close
  
  File.open(file_path, 'w') do |f|
    f.puts(change.call(contents))
  end
end

change_lines_in_file('../node_modules/@react-native-community/picker/RNCPicker.podspec') do |lines|
  lines.map { |line| line.include?("s.dependency 'React-Core'") ? "s.dependency 'React'" : line}
end

In this way, everytime when I am trying to run pod install, it finds my outdated RNCPicker and replace the React-Core dependency name to React