模拟器中的@_dynamicReplacement（for：）错误

问题描述

我使用CocoaPods管理我的私有组件。现在，我有一个组件 Test 。其中一个类的声明如下：

I use CocoaPods to manage my private components. Now I have a component Test. The declaration of one of the classes is as follows:

open class Test {

    open dynamic func test() {
        print("test")
    }
}

我对此组件没有问题，它已经存在于我的私人仓库中

I have no problems with this component, it is already in my private repo

现在我还有一个名为<$ c $的组件c> Test2 。我想在 Test2 中使用 @_ dynamicReplacement（for：）交换 test（） 测试中的方法如下：

Now I have another component called Test2. I want to use @_dynamicReplacement(for:) in Test2 to exchange the test() method in Test as follows:

public extension Test {

    @_dynamicReplacement(for: test())
    public func test2() {
        print("test2")
    }
}

现在我想将Test2打包为Pod组件，例如Test。

Now I want to package Test2 as a pod component, like Test.

但是当我执行 pod spec lint 时，它报告一个错误：

But when I execute pod spec lint, it reports an error:

<unknown>:0: error: fatal error encountered during compilation; please file a bug report with your project and the crash log
<unknown>:0: note: unsupported relocation with subtraction expression, symbol '_$s9MBCRouter6RouterC23MBCNavigationController0cdB010NavigationORszrlE15navigationTest2yyF' can not be undefined in a subtraction expression

---

我发现此问题仅出现在 x86_64上在 i386 上。

我试图创建一个集成了测试和 Test2 。

I tried to create a project that integrates both Test and Test2.

在真实计算机上运行时，效果很好。但是当我在模拟器上运行它时，它会报告错误！

When I run it on a real machine, it works fine. But when I run it on the simulator, it reports an error!

当我将第二段代码放在Test组件中时，

When I placed the second piece of code above in the Test component, it worked without any problems.

因此，我认为需要以下两个条件来重现此错误：

So I think the following two conditions are needed to reproduce this bug:

1. 在 pod B 中，使用 @_ dynamicReplacement（for：）交换其他Pod中的方法组件


2. 在模拟器中运行项目

1. In pod B, use @_dynamicReplacement(for:) to swap methods in other pod components
2. Run the project in the simulator

我发现了这个问题，但是我可以解决不了，任何人都可以帮助解决这个问题吗？

I found this problem, but I can't solve it, can anyone help to solve this problem? thank you very much!

最后，我想谈谈我的开发环境

Finally, I want to talk about my development environment

1. 我使用CocoaPods 1.9.1，Xcode 11.4和Swift 5.2。


2. 仅 use_frameworks！用于podfile


3. Test 和 Test2 <$设置为 static_framework = true

1. I use CocoaPods 1.9.1, Xcode 11.4 and Swift 5.2.
2. Only use_frameworks! is used in the podfile
3. Test and Test2 .podspec files with set static_framework = true

推荐答案

要为模拟器进行构建，您需要在函数声明中添加 @objc 属性，例如：

To build for Simulator you need add @objc attribute to a function declaration e.g:

open class Test {

    open @objc dynamic func test() {
        print("test")
    }
}

更新：更常见的解决方案（包括泛型）-设置编译模式更改为增量，在这种情况下，您根本不需要使用 @objc 模拟器。

UPDATE: More common solution (included Generics) - set Compilation Mode to Incremental in Build Settings and in this case you don't need to use @objc at all for the Simulator.

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