pod 导入三方框架后报错Linker command failed with exit code 1，如 HandyJSON、MBProgressHUD

pod 倒入 老版本的三方框架后报错，比如 HandyJSON、MBProgressHUD

File not found: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc/libarclite_iphoneos.a

Linker command failed with exit code 1 (use -v to see invocation)

版本兼容问题，修改方法： 在Podfile文件中 target 'x x x' do 的上方 添加以下代码后，重新执行 pod install

#编译兼容老版本  iOS11.0

post_installdo|installer|

  installer.pods_project.targets.eachdo|target|

    target.build_configurations.eachdo|config|

      ifconfig.build_settings['IPHONEOS_DEPLOYMENT_TARGET'].to_f <11.0

        config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] ='11.0'

      end

    end

  end

end