创建多目标 Xamarin.Forms NuGet 包

Question

我正在尝试构建可安装在 Xamarin.Android、Xamarin.iOS、Xamarin.UWP 和 Xamarin.Forms (.NET Standard) 项目中的单个 NuGet 包。我无法使用 .NET Standard，因为我的 Android 项目需要自定义 Activity，iOS 项目需要自定义 AppDelegate，我的 iOS 项目需要自定义 MainPage UWP项目。在启动器中，我想使用 ServiceCollection 作为 DI 提供程序。

在文档中他们仍然提到 Portable Class Library (explicitly mentioned legacy, doesn't exist anymore in VS), or Manually Creating Packages（不知道在这里做什么），然后你也有提到 Xamarin.Forms Plugin 的网站，它也不再存在了.

我已经为所有 4 个项目制定了解决方案，但我不知道如何为所有 4 个项目（所有 3 个目标平台）创建一个 NuGet 包。

有谁知道我们如何构建包含 Android、iOS 和 UWP 代码的多目标 NuGet 包，就像 Xamarin.Forms NuGet package 一样？

我也看到过这样的讨论：，但我不确定这是否仍然相关，因为 build.props 和 build.targets 不再存在于MvvmCross 回购。

Answer 1

起点是https://github.com/onovotny/MSBuildSdkExtras

一年前，我做了一个样本（并收集了一些文档和参考资料），这可能对这个主题有启发：https://github.com/ZeProgFactory/MSBuildSdkExtrasTest

并且https://github.com/ZeProgFactory/MediaPlayer正在使用它

最后，您应该在 https://github.com/jamesmontemagno

查看 James Montemagno 组件的存储库

有了这些参考资料，您应该可以开始了。但是所有这些都与您的方法有很大的不同：

他们正在使用一个项目（通过 MSBuildSdkExtras），
为所有平台构建
最后，二进制文件被组装在一个 NuGet 中。

也许你可以只做这最后一步。无论如何，这种方法至少是一种选择。希望这会有所帮助……

Answer 2

我已将工作版本推送到 https://github.com/MintPlayer/MintPlayer.MVVM

csproj 文件

<Project Sdk="MSBuild.Sdk.Extras/2.0.41">

  <!-- You must have the Android 8.0 SDK installed through the Android SDK manager -->

  <PropertyGroup>
    <AssemblyName>MintPlayer.MVVM</AssemblyName>
    <RootNamespace>MintPlayer.MVVM</RootNamespace>
    <TargetFrameworks>netstandard2.0;Xamarin.iOS10;MonoAndroid80;uap10.0.16299</TargetFrameworks>
    <_WriteTelemetryProperties>false</_WriteTelemetryProperties>
    <Authors>Pieterjan De Clippel</Authors>
    <Company>MintPlayer</Company>
    <Product>MintPlayer.MVVM</Product>
    <IncludeSymbols>true</IncludeSymbols>
    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
    <Description>This package allows you to implement ViewModel Navigation and Dependency Injection in a Xamarin.Forms project</Description>
    <Version>1.0.0</Version>
    <Copyright />
    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
    <PackageProjectUrl>https://github.com/MintPlayer/MintPlayer.MVVM</PackageProjectUrl>
    <RepositoryUrl>https://github.com/MintPlayer/MintPlayer.MVVM</RepositoryUrl>
    <PackageTags>Xamarin.Forms, Viewmodel navigation, Dependency Injection</PackageTags>
    <PackageReleaseNotes>This package is still under construction</PackageReleaseNotes>
  </PropertyGroup>

  <ItemGroup>
    <Compile Remove="Platforms\**\*.cs" />
    <None Include="Platforms\**\*.cs" />
    <None Include="Resources\*.cs" />
    <Compile Remove="Resources\*.cs" />
  </ItemGroup>

  <ItemGroup Condition=" $(TargetFramework.StartsWith('uap')) ">
    <Compile Include="Platforms\UAP\**\*.cs" />
    <Compile Include="Platforms\Common\**\*.cs" />
  </ItemGroup>

  <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard')) ">
    <Compile Include="Platforms\Common\**\*.cs" />
  </ItemGroup>

  <ItemGroup Condition=" $(TargetFramework.StartsWith('Xamarin.iOS')) ">
    <Compile Include="Platforms\iOS\**\*.cs" />
    <Compile Include="Platforms\Common\**\*.cs" />
  </ItemGroup>

  <ItemGroup Condition=" $(TargetFramework.StartsWith('MonoAndroid')) ">
    <Compile Include="Platforms\Android\**\*.cs" />
    <Compile Include="Platforms\Common\**\*.cs" />
    
    <AndroidResource Include="Resources\**\*.xml" SubType="Designer" Generator="MSBuild:UpdateAndroidResources" />
    <AndroidResource Include="Resources\**\*.axml" SubType="Designer" Generator="MSBuild:UpdateAndroidResources" />
  </ItemGroup>

  <ItemGroup>
    <None Remove="Platforms\Common\MintPlayerMvvmExtensions.cs" />
    <None Remove="Platforms\Common\NavigationService.cs" />
    <None Remove="Platforms\Common\Platform.cs" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="3.1.6" />
    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.6" />

    <!--<PackageReference Include="Xamarin.Forms" Version="4.5.0.495" />-->
    <PackageReference Include="Xamarin.Forms" Version="3.1.0.697729" />
  </ItemGroup>

</Project>

Directory.build.props

<Project>
  <PropertyGroup>
    <Company>MintPlayer</Company>
    <Copyright>Copyright © MintPlayer</Copyright>
    <RepositoryUrl>https://github.com/MintPlayer/MintPlayer.MVVM</RepositoryUrl>
    <Authors>Pieterjan De Clippel</Authors>
    <Owners>MintPlayer</Owners>
    <PackageReleaseNotes />
    <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
    <PublishRepositoryUrl>true</PublishRepositoryUrl>
    <RepositoryType>git</RepositoryType>
    <Product>$(AssemblyName) ($(TargetFramework))</Product>
    <NeutralLanguage>en</NeutralLanguage>
    
    <LangVersion>latest</LangVersion>
    <NoWarn>$(NoWarn);1591;1701;1702;1705;VSX1000;NU1603</NoWarn>
    <GenerateDocumentationFile Condition=" '$(Configuration)' == 'Release' ">true</GenerateDocumentationFile>
    <GeneratePackageOnBuild Condition=" '$(Configuration)' == 'Release' and '$(IsTestProject)' != 'true'">true</GeneratePackageOnBuild>
    
    <Platform>AnyCPU</Platform>
    <DebugType>portable</DebugType>
    <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
    <EmbedUntrackedSources>true</EmbedUntrackedSources>
    
    <IsTestProject>$(MSBuildProjectName.Contains('UnitTests'))</IsTestProject>
  </PropertyGroup>
</Project>

Directory.build.targets

<Project>
  <PropertyGroup Condition="$(TargetFramework.StartsWith('netstandard'))">
    <DefineConstants>$(DefineConstants);NETSTANDARD;PORTABLE</DefineConstants>
  </PropertyGroup>
  <PropertyGroup Condition="$(TargetFramework.StartsWith('Xamarin.iOS'))">
    <DefineConstants>$(DefineConstants);MONO;UIKIT;COCOA;IOS</DefineConstants>
  </PropertyGroup>
  <PropertyGroup Condition="$(TargetFramework.StartsWith('MonoAndroid'))">
    <DefineConstants>$(DefineConstants);MONO;ANDROID</DefineConstants>
    <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
    <AndroidResgenClass>Resource</AndroidResgenClass>
    <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
  </PropertyGroup>
</Project>

您必须将以下内容添加到您的 .sln 文件

Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{7004E39A-BAF2-4F2F-B505-CC3DEC393CB6}"
    ProjectSection(SolutionItems) = preProject
        Directory.build.props = Directory.build.props
        Directory.build.targets = Directory.build.targets
    EndProjectSection
EndProject

创建多目标 Xamarin.Forms NuGet 包

Create multi-target Xamarin.Forms NuGet package

c#

xamarin.forms

nuget-package

class-library

multitargeting