IPHONEOS_DEPLOYMENT_TARGET is set to 8.0, but the range of supported deployment

ここに解決策があります.ここに記録してください.

解決策一(私が使っているのはこの方法):

Code Block 
post_install do |installer|
 installer.pods_project.targets.each do |target|
  target.build_configurations.each do |config|
   config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '9.0'
  end
 end
end

解決方法二:

post_install do |installer|
 installer.pods_project.targets.each do |target|
  target.build_configurations.each do |config|
   config.build_settings.delete 'IPHONEOS_DEPLOYMENT_TARGET'
  end
 end
end