如果有人在更新到最新的react本机时遇到问题，请尝试更新pod文件

  use_flipper!
  post_install do |installer|
    flipper_post_install(installer)
    installer.pods_project.targets.each do |target|
      target.build_configurations.each do |config|
        config.build_settings.delete 'IPHONEOS_DEPLOYMENT_TARGET'
      end
    end
   end

无需在pod安装后指定部署目标，您可以为每个pod删除pod部署目标，这将导致部署目标从Podfile继承。

您可能需要运行pod install以使效果发生。

platform :ios, '12.0'

  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

迭代Tao-Nhan Nguyen的答案，计算每个pod的原始值集，只在它不大于8.0时调整它……在Podfile中添加以下内容:

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      if Gem::Version.new('8.0') > Gem::Version.new(config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'])
        config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '8.0'
      end
    end
  end
end

首先将部署更改为您所选择的:例如'11.0' 并将此步骤添加到pod文件的最后

end
post_install do |installer|
 installer.pods_project.targets.each do |target|
  target.build_configurations.each do |config|
   config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '11.0'
  end
 end
end

我解决了这个问题，我把build system从New build system改为Legacy build system

在Xcode v10+中，选择文件>项目设置

在之前的Xcode中，选择File > Workspace Settings

将Build System从New Build System更改为Legacy Build System—>单击Done。

您所需要做的就是取消下面这一行的注释

# platform :ios, '8.0'

OR

# platform :ios, '9.0'

等等……

然后打开终端的iOS文件夹，传递这些命令:

% pod repo update
% pod install