Flutter 颤振：Can'；不要创建插件包

我正在尝试创建一个插件包，以便在Android（使用Kotlin）和iOS（使用Swift）中访问一些特定的硬件API。为此，我尝试按照这里的说明进行操作：

我现在只研究问题的快速方面，因此到目前为止所做的工作如下：

1）转到其他Dart软件包所在的目录（它们是非颤振软件包，工作正常），然后运行：

这创建了文档中描述的整个内容，没有报告任何错误

2）然后，如前一个链接中所述，我转到

my_plugin/example

并运行

flatter build ios——无代码设计

，输出如下（显然正常）：

3）因此，现在刚创建的插件试图将其添加到主项目中，因此，在其

pubspec.yaml

文件中插入了以下行（插件位于

。/pkgs

中，与我正在使用的颤振应用程序相关：

dependencies:
  flutter:
    sdk: flutter
  my_plugin:
    path: ../pkgs/my_plugin

4）现在刚刚尝试在物理设备和模拟器中运行颤振应用程序，始终显示以下错误：

Launching lib/main.dart on iPhone Xʀ in debug mode...
CocoaPods' output:
↳
      Preparing
    Analyzing dependencies
    Inspecting targets to integrate
      Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)
    Finding Podfile changes
      A my_plugin
      - Flutter
    Fetching external sources
    -> Fetching podspec for `Flutter` from `.symlinks/flutter/ios`
    -> Fetching podspec for `my_plugin` from `.symlinks/plugins/my_plugin/ios`
    Resolving dependencies of `Podfile`
    Comparing resolved specification to the sandbox manifest
      A Flutter
      A my_plugin
    Downloading dependencies
    -> Installing Flutter (1.0.0)
    -> Installing my_plugin (0.0.1)
      - Running pre install hooks
    [!] Unable to determine Swift version for the following pods:
    - `my_plugin` does not specify a Swift version and none of the targets (`Runner`) integrating it have the `SWIFT_VERSION` attribute set. Please contact the author or set the `SWIFT_VERSION` attribute in at least one of the targets that integrate this pod.
    /usr/local/Cellar/cocoapods/1.6.1/libexec/gems/cocoapods-1.6.1/lib/cocoapods/installer/xcode/target_validator.rb:115:in `verify_swift_pods_swift_version'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/gems/cocoapods-1.6.1/lib/cocoapods/installer/xcode/target_validator.rb:37:in `validate!'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/gems/cocoapods-1.6.1/lib/cocoapods/installer.rb:459:in `validate_targets'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/gems/cocoapods-1.6.1/lib/cocoapods/installer.rb:138:in `install!'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/gems/cocoapods-1.6.1/lib/cocoapods/command/install.rb:48:in `run'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/gems/cocoapods-1.6.1/lib/cocoapods/command.rb:52:in `run'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/gems/cocoapods-1.6.1/bin/pod:55:in `<top (required)>'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/bin/pod:22:in `load'
    /usr/local/Cellar/cocoapods/1.6.1/libexec/bin/pod:22:in `<main>'
Error output from CocoaPods:
↳
        WARNING: CocoaPods requires your terminal to be using UTF-8 encoding.
        Consider adding the following to ~/.profile:
        export LANG=en_US.UTF-8

Error running pod install
Error launching application on iPhone Xʀ.
Exited (sigterm)

（这个想法来源于，是的：我尝试了至少一个不同的版本号）。错误仍然是一样的

生成的插件的pod文件是：

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 parse_KV_file(file, separator='=')
  file_abs_path = File.expand_path(file)
  if !File.exists? file_abs_path
    return [];
  end
  pods_ary = []
  skip_line_start_symbols = ["#", "/"]
  File.foreach(file_abs_path) { |line|
      next if skip_line_start_symbols.any? { |symbol| line =~ /^\s*#{symbol}/ }
      plugin = line.split(pattern=separator)
      if plugin.length == 2
        podname = plugin[0].strip()
        path = plugin[1].strip()
        podpath = File.expand_path("#{path}", file_abs_path)
        pods_ary.push({:name => podname, :path => podpath});
      else
        puts "Invalid plugin specification: #{line}"
      end
  }
  return pods_ary
end

target 'Runner' do
  use_frameworks!

  # Prepare symlinks folder. We use symlinks to avoid having Podfile.lock
  # referring to absolute paths on developers' machines.
  system('rm -rf .symlinks')
  system('mkdir -p .symlinks/plugins')

  # Flutter Pods
  generated_xcode_build_settings = parse_KV_file('./Flutter/Generated.xcconfig')
  if generated_xcode_build_settings.empty?
    puts "Generated.xcconfig must exist. If you're running pod install manually, make sure flutter packages get is executed first."
  end
  generated_xcode_build_settings.map { |p|
    if p[:name] == 'FLUTTER_FRAMEWORK_DIR'
      symlink = File.join('.symlinks', 'flutter')
      File.symlink(File.dirname(p[:path]), symlink)
      pod 'Flutter', :path => File.join(symlink, File.basename(p[:path]))
    end
  }

  # Plugin Pods
  plugin_pods = parse_KV_file('../.flutter-plugins')
  plugin_pods.map { |p|
    symlink = File.join('.symlinks', 'plugins', p[:name])
    File.symlink(p[:path], symlink)
    pod p[:name], :path => File.join(symlink, 'ios')
  }
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['SWIFT_VERSION'] = '4.1'
      config.build_settings['ENABLE_BITCODE'] = 'NO'
    end
  end
end

我做了同样的添加到颤振应用程序的播客文件。另外，指定iOS平台的第一行最初是注释的（这会生成一个警告），因此我还从两个pod文件中取消了该行的注释

这是颤振医生的输出：

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.2.1, on Mac OS X 10.14.3 18D109, locale en-ES)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 10.2)
[✓] Android Studio (version 3.3)
[✓] VS Code (version 1.33.1)
[✓] Connected device (1 available)

• No issues found!

问题是如何使这项工作发挥作用。我甚至没有开始添加我自己的代码，但我仍然坚持使用非常基本的Flitter插件创建工具。另外，我不知道为什么我需要在我的包中包含所有脏的和复杂的

示例
子目录（因此，作为第二个问题，这并不重要：我可以在工作完成后删除它吗？）

编辑：我做了另一个测试：使用VSC的“颤振：新项目”命令（创建“颤振101”增量计数器示例）创建了一个空应用程序。然后再次按照上面描述的步骤创建插件包，并在新创建的项目中包含该包并在iOS模拟器中运行时出现相同的错误。因此，除了将新插件作为依赖项添加到示例应用程序之外，我这里绝对没有任何代码。
尝试使用Xcode打开文件夹
IOS/Runner/Runner.xcworkspac
中的IOS项目。然后在该目录的任意位置创建/添加一个新的Swift文件。然后，Xcode将自动将所需的更改应用到您的Flitter应用程序的swift部分

另一件事可能是您的PodFile被修改了：尝试通过以下链接将其与Google的主PodFile进行比较：
在尝试了几种方法后，我在GitHub线程上发现了以下解决方案：


严格遵循这些步骤后，我们终于成功了

有几件有趣的事是：

我还尝试从Android Studio（而不是从命令行或VSC）创建插件。如果没有上一个链接中描述的步骤，它就无法工作，但这些步骤最终是在Android Studio创建的插件上完成的（因此我不知道这是否适用于VSC创建的插件，我必须说很可能是的，因为我没有看到命令结果上的任何差异）。我之所以提到这一点，是因为这个答案表明，这可能会解决问题：

源代码中有两个Podfile文件：一个用于插件，另一个用于应用程序本身。我修改了这两个项目，并打开了这两个XCode（自动生成的调用）项目

我还在pod文件中添加了以下行：
config.build\u settings['SWIFT\u VERSION']='4.2'
，就在出现以下行之前：
config.build\u settings['ENABLE\u BITCODE']='NO'

在这两个Podfile文件中，取消对
平台：ios，'8.0'
的注释，并将版本号更改为9.0。这并没有解决问题，但在运行
pod install

你是说在我的插件/example/ios/Runner.xcworkspace中？（my_plugin/example/ios/Runner文件夹中没有XCode工作区）是的，相同的目录，但是用XCode程序打开它，而不是用你正在使用的程序来构建你的Flatter应用程序。我在我之前的评论中在工作区中做了这件事，但它不起作用（完全相同的错误）。以防万一，做完这些之后，我转到我的颤振应用程序并运行“颤振包获取”。另外，runner示例在模拟器上运行（只是一个空白屏幕，但这似乎是一个pod问题，而不是XCode问题），您可以粘贴您的pod文件以查看其中的内容吗？谢谢。我编辑这个问题是为了包含插件的podfile（在Flutter应用程序中还有一个）。
config.build_settings['SWIFT_VERSION'] = '4.1'

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 parse_KV_file(file, separator='=')
  file_abs_path = File.expand_path(file)
  if !File.exists? file_abs_path
    return [];
  end
  pods_ary = []
  skip_line_start_symbols = ["#", "/"]
  File.foreach(file_abs_path) { |line|
      next if skip_line_start_symbols.any? { |symbol| line =~ /^\s*#{symbol}/ }
      plugin = line.split(pattern=separator)
      if plugin.length == 2
        podname = plugin[0].strip()
        path = plugin[1].strip()
        podpath = File.expand_path("#{path}", file_abs_path)
        pods_ary.push({:name => podname, :path => podpath});
      else
        puts "Invalid plugin specification: #{line}"
      end
  }
  return pods_ary
end

target 'Runner' do
  use_frameworks!

  # Prepare symlinks folder. We use symlinks to avoid having Podfile.lock
  # referring to absolute paths on developers' machines.
  system('rm -rf .symlinks')
  system('mkdir -p .symlinks/plugins')

  # Flutter Pods
  generated_xcode_build_settings = parse_KV_file('./Flutter/Generated.xcconfig')
  if generated_xcode_build_settings.empty?
    puts "Generated.xcconfig must exist. If you're running pod install manually, make sure flutter packages get is executed first."
  end
  generated_xcode_build_settings.map { |p|
    if p[:name] == 'FLUTTER_FRAMEWORK_DIR'
      symlink = File.join('.symlinks', 'flutter')
      File.symlink(File.dirname(p[:path]), symlink)
      pod 'Flutter', :path => File.join(symlink, File.basename(p[:path]))
    end
  }

  # Plugin Pods
  plugin_pods = parse_KV_file('../.flutter-plugins')
  plugin_pods.map { |p|
    symlink = File.join('.symlinks', 'plugins', p[:name])
    File.symlink(p[:path], symlink)
    pod p[:name], :path => File.join(symlink, 'ios')
  }
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['SWIFT_VERSION'] = '4.1'
      config.build_settings['ENABLE_BITCODE'] = 'NO'
    end
  end
end

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.2.1, on Mac OS X 10.14.3 18D109, locale en-ES)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 10.2)
[✓] Android Studio (version 3.3)
[✓] VS Code (version 1.33.1)
[✓] Connected device (1 available)

• No issues found!