Override Xcode Build Settings on Podfile for Unity-iPhone

Unity-iPhonePodfile

target 'Unity-iPhone' do
  
end

target 'Unity-iPhone Tests' do
  
end

pre_install do |installer|
  XCODE_PROJECT_PATH  = './Unity-iPhone.xcodeproj'
  BUILD_CONFIGURATION = 'Release'

  SEARCH_PATH_SETTINGS = ['HEADER_SEARCH_PATHS', 'OTHER_CFLAGS', 'OTHER_LDFLAGS']
  BUILD_PATH_SETTINGS  = ['CONFIGURATION_BUILD_DIR']

  proj = Xcodeproj::Project.open(XCODE_PROJECT_PATH)

  puts "Override Build Settings for #{proj.path}"

  proj.targets.each do |target|
    puts "Override for target:#{target.name}"

    SEARCH_PATH_SETTINGS.each do |key|
      values = [*target.build_configuration_list.get_setting(key)[BUILD_CONFIGURATION]]
      overriden_values = (values.include? '$(inherited)') ? values : ['$(inherited)'] + values
      target.build_configuration_list.set_setting(key, overriden_values)

      puts "Override for key:#{key} from:#{values} to:#{overriden_values}"
    end

    BUILD_PATH_SETTINGS.each do |key|
      value = target.build_configuration_list.get_setting(key)
      overriden_value = '$(BUILD_DIR)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)'
      target.build_configuration_list.set_setting(key, overriden_value)

      puts "Override for key:#{key} from:#{value} to:#{overriden_value}"
    end
  end

  proj.save

  puts "Override saved"
end