Can the Podfile generation better handle logical blocks

从 lib/services/cocoapods-platform-manager.ts 开始，重点查看 selectPlatformDataFromProjectPodfile 及其平台匹配表达式。跟踪 Podfile 行是如何被提升的，以及未加引号的 Ruby 表达式和 hooks 外部的代码是如何处理的。完成的标准是，所请求的基于变量的 deployment target 和前置条件行仍可使用，且不会被剥离。

Is your feature request related to a problem? Please describe.

I wish I could apply variable logic when defining iOS deployment target in the application Podfile.

To set the IPHONEOS_DEPLOYMENT_TARGET we must define the platform version in two separate files to ensure both the target application and all dependencies meet our minimum desired version.

1. App_Resources/iOS/build.xcconfig
   IPHONEOS_DEPLOYMENT_TARGET=16
2. App_Resources/iOS/Podfile
   platform :ios, '16.0'

As suggested in the troubleshooting documentation, to ensure that all dependencies are also configured to this target it is suggested that we do the following... which works fine.

platform :ios, '13.0'

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '13.0'
    end
  end
end

*See https://docs.nativescript.org/troubleshooting#cocoapods-could-not-find-compatible-versions-for-pod-higher-minimum-deployment-target

This makes 3 places where I need to update the target version for iOS.

Inspired by this answer, if I try to apply any kind of logic in the application Podfile, it is either stripped by the CocoaPodsPlatformManager or ignored altogether.

Doing this:

app_ios_deployment_target = Gem::Version.new('16.0')
platform :ios, app_ios_deployment_target.version

Results in this:

platform :ios, 

It looks like the Regex is trying to match a platform within quotes('") only.
^\\s*?#\\s*?(platform\\b\\s*?\\:\\s*?ios\\b(?:,\\s*?['"](.+)['"])?)

Ruby will also complain the variable app_ios_deployment_target does not exist, which is true because only the line matched by the Regex above is hoisted above any post_install hooks and all other code blocks are lost.

Describe the solution you'd like

It would be great if CocoaPodsPlatformManager.selectPlatformDataFromProjectPodfile could be expanded to match other expressions.

It would also be great if all other lines that are not the platform definition and are outside of hooks are hoisted first, so that variables could be used.

This could mean that we can have one source of truth when defining the iOS target. Which could be in App_Resources/iOS/build.xcconfig and the read from the Podfile, or better yet an environment variable.

Describe alternatives you've considered

No response

Anything else?

No response

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