iOS 引用 ReactiveUI 7.4 时启动错误

Question

我有一个 Xamarin Forms 项目，其中包含一个包含所有代码的 .Net Standard 1.4 核心库。我在核心项目和 iOS 项目中都引用了 ReactiveUI 7.4。但是当我在 iOS 模拟器上编译和运行时，应用程序启动时出现以下错误：

2017-08-24 13:39:39.040 TestProject.iOS[25074:307385] Could not register the assembly 'ReactiveUI': System.Reflection.ReflectionTypeLoadException: The classes in the module cannot be loaded.
  at (wrapper managed-to-native) System.Reflection.Assembly:GetTypes (System.Reflection.Assembly,bool)
  at System.Reflection.Assembly.GetTypes () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/10.12.0.20/src/mono/mcs/class/corlib/System.Reflection/Assembly.cs:410 
  at Registrar.DynamicRegistrar.CollectTypes (System.Reflection.Assembly assembly) [0x00000] in /Users/builder/data/lanes/4991/80b8487d/source/xamarin-macios/src/ObjCRuntime/DynamicRegistrar.cs:237 
  at Registrar.Registrar.RegisterAssembly (System.Reflection.Assembly assembly) [0x00056] in /Users/builder/data/lanes/4991/80b8487d/source/xamarin-macios/src/ObjCRuntime/Registrar.cs:1978 


Loaded assembly: /Library/Frameworks/Xamarin.Interactive.framework/Versions/Current/Agents/iOS/Xamarin.Interactive.iOS.dll [External]
Loaded assembly: /Library/Frameworks/Xamarin.Interactive.framework/Versions/Current/Agents/iOS/Xamarin.Interactive.dll [External]
Unhandled Exception:

System.BadImageFormatException: <Timeout exceeded getting exception details>

和

Unhandled Exception:
System.BadImageFormatException: Could not resolve field token 0x040000fd
File name: 'ReactiveUI'
  at TestProject.iOS.AppDelegate..ctor () [0x00008] in C:\TestProject\TestProject.iOS\AppDelegate.cs:24 
  at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/4991/80b8487d/source/xamarin-macios/src/UIKit/UIApplication.cs:79 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/4991/80b8487d/source/xamarin-macios/src/UIKit/UIApplication.cs:63 
  at TestProject.iOS.Application.Main (System.String[] args) [0x00001] in C:\TestProject\TestProject.iOS\Main.cs:17 
2017-08-24 13:39:46.074 TestProject.iOS[25074:307385] Unhandled managed exception:

有人收到过这个错误吗？？

更新：

这是 link 在 iOS 上重现的错误：

https://github.com/assassin316/ReactiveUIError

Answer 1

所以我认为发生了一些事情，项目设置不正确

1) 您需要将 reactiveui nuget 安装到所有平台项目中

现在你只在 iOS 项目中安装了 reactiveui-core 你还需要安装 ReactiveUI

https://github.com/assassin316/ReactiveUIError/blob/master/ReactiveUIErrorTest/ReactiveUIErrorTest.iOS/packages.config

2) System.Reactive 库根本没有被 iOS 项目本身引用 https://github.com/assassin316/ReactiveUIError/blob/master/ReactiveUIErrorTest/ReactiveUIErrorTest.iOS/ReactiveUIErrorTest.iOS.csproj

所以它们只存在于packages.config文件中从 packages.config 文件中删除 Rx-* 条目并使用包管理器控制台手动安装它们

Install-Package Rx-Main -Version 2.2.5
Install-Package Rx-PlatformServices -Version 2.2.5
Install-Package Rx-Core -Version 2.2.5

或者只是将其添加到 iOS 项目的 csproj 文件中

<Reference Include="System.Reactive.Core, Version=2.2.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
  <HintPath>..\..\packages\Rx-Core.2.2.5\lib\portable-windows8+net45+wp8\System.Reactive.Core.dll</HintPath>
</Reference>
<Reference Include="System.Reactive.Interfaces, Version=2.2.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
  <HintPath>..\..\packages\Rx-Interfaces.2.2.5\lib\portable-windows8+net45+wp8\System.Reactive.Interfaces.dll</HintPath>
</Reference>
<Reference Include="System.Reactive.Linq, Version=2.2.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
  <HintPath>..\..\packages\Rx-Linq.2.2.5\lib\portable-windows8+net45+wp8\System.Reactive.Linq.dll</HintPath>
</Reference>
<Reference Include="System.Reactive.PlatformServices, Version=2.2.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
  <HintPath>..\..\packages\Rx-PlatformServices.2.2.5\lib\portable-windows8+net45+wp8\System.Reactive.PlatformServices.dll</HintPath>
</Reference>

或将 iOS 项目转为使用 PackageReferences

3) Reactiveui-xamforms 也需要安装到平台项目中

此时我能够运行你的项目

您对问题的最佳提示是在您发布的例外情况之上

2017-09-02 12:57:43.983 Sekuence.iOS[86898:37039424] Could not find System.Reactive.Core referenced by assembly ReactiveUI,Version=7.4.0.0, Culture=neutral, PublicKeyToken=null.

2017-09-02 12:57:43.985 Sekuence.iOS[86898:37039424] Could not find System.Reactive.Interfaces referenced by assembly ReactiveUI, Version=7.4.0.0, Culture=neutral, PublicKeyToken=null.

2017-09-02 12:57:43.986 Sekuence.iOS[86898:37039424] Could not find System.Reactive.Linq referenced by assembly ReactiveUI, Version=7.4.0.0, Culture=neutral, PublicKeyToken=null.

2017-09-02 12:57:43.986 Sekuence.iOS[86898:37039424] Could not find System.Reactive.PlatformServices referenced by assembly ReactiveUI, Version=7.4.0.0, Culture=neutral, PublicKeyToken=null.

2017-09-02 12:57:44.029 Sekuence.iOS[86898:37039424] Could not find System.Reactive.Core referenced by assembly ReactiveUIErrorTest.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.

2017-09-02 12:57:44.030 Sekuence.iOS[86898:37039424] Could not find ReactiveUI.XamForms referenced by assembly ReactiveUIErrorTest.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.

所以基本上是说它找不到任何这些 DLL。我查看了 iOS 项目的 bin 文件夹，果然 none 在那里。所以我只是重新安装了所有这些软件包，然后一切正常

iOS 引用 ReactiveUI 7.4 时启动错误

iOS launch error when referencing ReactiveUI 7.4

xamarin

xamarin.ios

xamarin.forms

reactiveui