将flutter module打包成framework文件

1、flutter_module目录下执行以下命令

//选择不签名
flutter build ios --release --no-codesign
//构建模拟器的
flutter build ios --simulator

该命令会在build目录下iOS文件夹中生成.framework文件。
我这边使用了一个脚本，可参考如下：

#!/bin/zsh
#把生产的framework迁移出来好方便拷贝,路径是放在项目的script目录下,所以稍有调整
#先到脚本所在目录,为了无论执行脚本的目录在哪里都一样定位
BASEDIR=$(dirname $0)
cd $BASEDIR
cd '..'

build_dir=build/ios/Release-iphoneos
#build_dir=build/ios/Debug-iphoneos
target_path=ios_framework

mkdir -p $target_path
echo "clean build and target path:${target_path}"
find $target_path -name '*.framework' | xargs rm -rf

#echo "=========build======="
flutter build ios --release --no-codesign

echo "=========copy build to target========"
find $build_dir -maxdepth 2 -name '*.framework' |xargs -I F cp -r -fi "F" $target_path
#echo "=========delete duplicate files========"
cd $target_path
rm -rf 'Pods_Runner.framework'

上述脚本会在项目目录下生成一个ios_framework文件夹，并将.framework拷贝到这里。

2、将生成的.framework文件copy到另一个文件夹下，并配置一个podspec文件

参考如下：
我这边是copy到一个TestFlutterFrameWork文件夹下，并将framework放在xc_output/Release文件夹下

Pod::Spec.new do |spec|

  spec.name         = "TestFlutterFrameWork"
  spec.version      = "1.0.10"
  spec.summary      = "A short description of TestFlutterFrameWork."
  spec.description  = <<-DESC
This is xcframeworks for Flutter for TestiOSFlutter
                   DESC

  spec.homepage     = "http://EXAMPLE/TestiOSFlutter"
  spec.license      = { :type => "MIT", :file => "FILE_LICENSE" }
  spec.author             = { "xxx" => "xxxxx@xx.cn" }

  spec.source       = { :git => "https://xxxxxxxxx.git", :branch => "xxxx_1.0" }
  #, :tag => "#{spec.version}"

  # spec.source_files  = "Classes", "Classes/**/*.{h,m}"
  # spec.exclude_files = "Classes/Exclude"

  # spec.public_header_files = "Classes/**/*.h"

  spec.vendored_frameworks = 'xc_output/Release/*.framework'

end

3、回到原生iOS项目下，配置podfile文件

参考如下：

# Uncomment the next line to define a global platform for your project
 platform :ios, '13.0'

FLUTTER_DEV_MODE = "false"
print "FLUTTER_DEV_MODE=", FLUTTER_DEV_MODE, "\n"

if FLUTTER_DEV_MODE == "true"
  print "当前为flutter开发模式\n"
  flutter_application_path = '../flutter_test_module'
  load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
else
  print "当前为flutter内嵌模式\n"
end

target 'testApp' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!
  
  
  if FLUTTER_DEV_MODE == "true"
    install_all_flutter_pods(flutter_application_path)
  else
    pod 'TestFlutterFrameWork', :path => '../TestFlutterFrameWork'
  end
  # Pods for testApp

post_install do |installer|
  if FLUTTER_DEV_MODE == "true"
      flutter_post_install(installer) if defined?(flutter_post_install)
  end
end

end

定义一个变量FLUTTER_DEV_MODE控制是本地集成，还是framework集成。
再将TestFlutterFrameWork以本地文件夹的形式引入pod

pod 'TestFlutterFrameWork', :path => '../TestFlutterFrameWork'

4、执行pod install

完成

遇到一个问题，就是没有生成FlutterPluginRegistrant.framework，后来发现，在flutter项目中随便引入一个插件库就可以了