从年初开始在项目中引入flutter，用其实现了部分简单的页面。团队中Pod的使用和主流有些不一样，git是不忽略Pods目录的😆。
通过pod引入Flutter module后，Pod中Flutter相关的Targrt中会写入Flutter.xcframework的绝对路径，所以不同的电脑上如果Flutter安装路径不同，就会编译报错，找不到Flutter.xcframework。
有比较简单的解决方案
- Pods文件夹不要上传到git
- 确保各电脑的flutter安装路径统一，比如都是
Users/flutter/
我们想学习下flutter的构建方式，因此决定通过编写脚本的方式解决这个问题
通过分析，看到路径的配置是在xxxxxx/flutter/packages/flutter_tools/bin/podhelper.rb这个脚本中(省略了无关的代码)
def flutter_additional_ios_build_settings(target)
...
artifacts_dir = File.join('..', '..', '..', '..', 'bin', 'cache', 'artifacts', 'engine')
debug_framework_dir = File.expand_path(File.join(artifacts_dir, 'ios', 'Flutter.xcframework'), __FILE__)
release_framework_dir = File.expand_path(File.join(artifacts_dir, 'ios-release', 'Flutter.xcframework'), __FILE__)
...
target.build_configurations.each do |build_configuration|
...
# Skip other updates if it's not a Flutter plugin (transitive dependency).
next unless target.dependencies.any? { |dependency| dependency.name == 'Flutter' }
...
# Profile can't be derived from the CocoaPods build configuration. Use release framework (for linking only).
configuration_engine_dir = build_configuration.type == :debug ? debug_framework_dir : release_framework_dir
Dir.new(configuration_engine_dir).each_child do |xcframework_file|
next if xcframework_file.start_with?('.') # Hidden file, possibly on external disk.
if xcframework_file.end_with?('-simulator') # ios-arm64_x86_64-simulator
build_configuration.build_settings['FRAMEWORK_SEARCH_PATHS[sdk=iphonesimulator*]'] = "\"#{configuration_engine_dir}/#{xcframework_file}\" $(inherited)"
elsif xcframework_file.start_with?('ios-') # ios-arm64
build_configuration.build_settings['FRAMEWORK_SEARCH_PATHS[sdk=iphoneos*]'] = "\"#{configuration_engine_dir}/#{xcframework_file}\" $(inherited)"
# else Info.plist or another platform.
end
end
...
end
end
如果能够修改这里脚本写入的路径，比如debug_framework_dir = File.join("$(Flutter_Install_Path)", 'bin', 'cache', 'artifacts', 'engine', 'ios', 'Flutter.xcframework')，然后只需要在xcconfig中定义不同的Flutter_Install_Path就可以解决问题了。
但是修改flutter中的脚本是比较危险的操作，因此决定通过编写脚本再次修改掉flutter写入的Flutter.xcframework路径。
方案还是比较简单的，下面直接给出步骤：
-
在Podfile同级目录创建一个文件
Flutter_Path.xcconfig，写入自己电脑上Flutter安装路径kv （这个文件是不需要加入git的)Flutter_Install_Path = /Users/dadadongl/flutter -
修改Podfile中的脚本
# 修改前 post_install do |installer| flutter_post_install(installer) if defined?(flutter_post_install) end修改后
post_install do |installer| # 先执行flutter正常的脚本 flutter_post_install(installer) if defined?(flutter_post_install) # 注入环境变量 & 修改flutter默认写入的framework search path # 遍历Pod中的Targets installer.pods_project.targets.each do |target| # 修改flutter.xcframework的引用路径配置 （后面这段脚本基本是基于flutter的脚本修改的，做到改动最少） # 跳过没有依赖'Flutter'的target next unless target.dependencies.any? { |dependency| dependency.name == 'Flutter' } # 构造使用了环境变量$(Flutter_Install_Path)"的search path debug_framework_dir = File.join("$(Flutter_Install_Path)", 'bin', 'cache', 'artifacts', 'engine', 'ios', 'Flutter.xcframework') release_framework_dir = File.join("$(Flutter_Install_Path)", 'bin', 'cache', 'artifacts', 'engine', 'ios-release', 'Flutter.xcframework') # 解析自定义的xcconfig文件，为了拿到Flutter安装路径 xcconfig = Xcodeproj::Config.new("./Flutter_Path.xcconfig") flutter_DIR = xcconfig.attributes["Flutter_Install_Path"] # 拿到Flutter的安装绝对路径 full_debug_framework_dir = File.join(flutter_DIR, 'bin', 'cache', 'artifacts', 'engine', 'ios', 'Flutter.xcframework') full_release_framework_dir = File.join(flutter_DIR, 'bin', 'cache', 'artifacts', 'engine', 'ios-release', 'Flutter.xcframework') # 遍历Target下的配置环境（Debug 、Release） target.build_configurations.each do |build_configuration| # 追加自定义环境变量到 Pod 库的 .xcconfig 文件，为了编译时能够识别$(Flutter_Install_Path) xcconfig_path = build_configuration.base_configuration_reference.real_path # 这里导入时相对pod.debug.xcconfig的路径 File.write(xcconfig_path, "#include \"../../../Flutter_Path.xcconfig\"", mode: 'a') # 修改 FRAMEWORK_SEARCH_PATHS configuration_engine_dir = build_configuration.type == :debug ? debug_framework_dir : release_framework_dir full_configuration_engine_dir = build_configuration.type == :debug ? full_debug_framework_dir : full_release_framework_dir Dir.new(full_configuration_engine_dir).each_child do |xcframework_file| next if xcframework_file.start_with?('.') # Hidden file, possibly on external disk. if xcframework_file.end_with?('-simulator') # ios-arm64_x86_64-simulator build_configuration.build_settings['FRAMEWORK_SEARCH_PATHS[sdk=iphonesimulator*]'] = "\"#{configuration_engine_dir}/#{xcframework_file}\" $(inherited)" elsif xcframework_file.start_with?('ios-') # ios-arm64 build_configuration.build_settings['FRAMEWORK_SEARCH_PATHS[sdk=iphoneos*]'] = "\"#{configuration_engine_dir}/#{xcframework_file}\" $(inherited)" # else Info.plist or another platform. end end end end end 重新执行Pod install
通过上述步骤后，就会把Flutter_Install_Path = /Users/dadadongl/flutter注入各Pod Target，然后修改后的framework search path就可以找到正确的路径，并成功编译。
