Flutter The iOS deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0,

在ios->podFile文件,打开platform :ios, '9.0'；

将下面

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
  end
end

改成

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
    flutter_additional_ios_build_settings(target)
 end
end