单独配置podfile macro

Podfile

# Uncomment the next line to define a global platform for your project
platform :ios, '9.0'

target 'demo' do
  # Comment the next line if you're not using Swift and don't want to use dynamic frameworks
  use_frameworks!
end

post_install do |installer|
    installer.pods_project.targets.each do |target|
        if target.name == "MQTTClient" 
            target.build_configurations.each do |config|
                if config.name == 'Debug'
                    config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] = ["COCOAPODS=1"]
                end
            end
        end
    end
end