为迅速

如果你在Xcode 12中使用CocoaPods，那么你可能会看到这个错误:

The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 14.

这是因为对iOS 8的支持已经放弃，但pod的最低部署目标是iOS 8。

在此问题解决之前，您可以将以下内容添加到Podfile中:

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

这将从项目中的所有pod中删除部署目标，并允许它们继承在Podfile顶部指定的项目/工作区部署目标。

对于React Native

删除。/project-root/ios/build文件夹，输入react-native run ios

为科尔多瓦

<preference name="deployment-target" value="8.0" />

对于flutter，这是我在<project_root>/ios/Podfile中使用的

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
  end
  
  installer.pods_project.build_configurations.each do |config|
    config.build_settings["EXCLUDED_ARCHS"] = "armv7"
    config.build_settings.delete 'IPHONEOS_DEPLOYMENT_TARGET'
  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。

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

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

对我有用:

rm ios/Podfile
flutter pub upgrade
flutter pub get
cd ios && pod update
flutter clean && flutter run
sudo arch -x86_64 gem install ffi
arch -x86_64 pod install