如何解决 flutter 中的 iOS 部署目标问题

Question

在为 ios 平台构建 flutter 应用程序时，我遇到了与IPHONEOS_DEPLOYMENT_TARGET相关的这个问题，我无法理解我应该如何纠正它

warning: 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 14.1.99. (in target 'firebase_core' from project 'Pods')
warning: 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 14.1.99. (in target 'firebase_auth' from project 'Pods')
warning: 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 14.1.99. (in target 'firebase_storage' from project 'Pods')
warning: 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 14.1.99. (in target 'firebase_messaging' from project 'Pods')
warning: 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 14.1.99. (in target 'firebase_analytics' from project 'Pods')
warning: 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 14.1.99. (in target 'cloud_functions' from project 'Pods')
warning: 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 14.1.99. (in target 'cloud_firestore' from project 'Pods')
warning: 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 14.1.99. (in target 'Flutter' from project 'Pods')
warning: 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 14.1.99. (in target 'Firebase' from project 'Pods')
warning: 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 14.1.99. (in target 'GoogleAppMeasurement' from project 'Pods')
warning: 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 14.1.99. (in target 'FirebaseAnalytics' from project 'Pods')

我的 ios flutter 项目的 pod 文件在这里

# Uncomment this line to define a global platform for your project
# platform :ios, '9.0'

# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}

def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
  end

  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT\=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

flutter_ios_podfile_setup

target 'Runner' do
  use_frameworks!
  use_modular_headers!

  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

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

在 xcode 中打开项目后，我检查了版本设置，但无法理解我应该如何纠正这个问题。 请指导如何修复 IPHONEOS_DEPLOYMENT_TARGET

Answer 1

取消注释：

# platform :ios, '9.0' 

到

platform :ios, '9.0'

将以下内容替换为

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

经过 ：

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
    target.build_configurations.each do |config|
      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '9.0'
    end
  end
end

执行以下命令：

1. 扑干净
2. 扑扑酒吧得到
3. cd ios && pod 安装
4. 构建项目
5. 关闭并重新打开 Xcode

Answer 2

这是因为所有 pod 都不是针对 iOS 9.0 的。

您可以在Podfile使用此解决方法

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

Answer 3

这些警告显然是无害的。 可以在flutter_additional_ios_build_settings()的源代码中找到以下文档：

当 pod 支持的版本低于 Xcode（Xcode 12 - iOS 9）支持的最低版本时，禁止显示警告。 # 这个警告无害但令人困惑——依赖支持低版本并不是一件坏事。

根据经验，我不建议使用 Flutter 构建环境。 您可以从新的 Flutter 项目更新它，但除非绝对必要（通常​​不需要），否则不要将自定义代码放在那里。