为什么链接器链接有错误的静态库？IOS

Why linker link static libraries with errors? iOS

提问by Yaroslav Skachkov

I have a problem with linking my mixed language framework to a project.

我在将混合语言框架链接到项目时遇到问题。

1) I create a framework with Swift and Objective-C classes.

1) 我用 Swift 和 Objective-C 类创建了一个框架。

2) The main logic was stored in the Swift file. For example the class with a method that calls NSLog("Swift log was called").

2) 主要逻辑存储在 Swift 文件中。例如具有调用 NSLog("Swift log was called") 方法的类。

3) Objective-C file has a class that has a method in which I create an instance of Swift class and call Swift-log method.

3）Objective-C 文件有一个类，该类有一个方法，我在其中创建 Swift 类的实例并调用 Swift-log 方法。

4) I link this framework with my Objective-C project, I can call all that I need in this project, but when I want to build this project I receive error "linker command failed with exit code 1 (use -v to see invocation)"

4) 我将这个框架与我的 Objective-C 项目联系起来，我可以在这个项目中调用我需要的所有东西，但是当我想构建这个项目时，我收到错误“ linker command failed with exit code 1 (use -v to see invocation)”

And warnings:

和警告：

ld: warning: Could not find auto-linked library 'swiftFoundation'

ld: warning: Could not find auto-linked library 'swiftFoundation'

ld: warning: Could not find auto-linked library 'swiftDarwin'

ld: warning: Could not find auto-linked library 'swiftDarwin'

ld: warning: Could not find auto-linked library 'swiftCoreFoundation'

ld: warning: Could not find auto-linked library 'swiftCoreFoundation'

ld: warning: Could not find auto-linked library 'swiftCore'

ld: warning: Could not find auto-linked library 'swiftCore'

ld: warning: Could not find auto-linked library 'swiftCoreGraphics'

ld: warning: Could not find auto-linked library 'swiftCoreGraphics'

ld: warning: Could not find auto-linked library 'swiftObjectiveC'

ld: warning: Could not find auto-linked library 'swiftObjectiveC'

ld: warning: Could not find auto-linked library 'swiftDispatch'

ld: warning: Could not find auto-linked library 'swiftDispatch'

ld: warning: Could not find auto-linked library 'swiftSwiftOnoneSupport'

ld: warning: Could not find auto-linked library 'swiftSwiftOnoneSupport'

I also saw the solution with importing empty Swift-file, but it necessary to make a project without any trash.

我也看到了导入空 Swift 文件的解决方案，但有必要制作一个没有任何垃圾的项目。

回答by Hussam Kurd

1. Open ios/YourAppName.xcodeproj in Xcode
2. Right-click on Your App Name in the Project Navigator on the left, and click New File…
3. Create a single empty Swift file to the project (make sure that Your App Name target is selected when adding)
4. when Xcode asks, press Create Bridging Header and do not remove Swift file then. re-run your build.

1. 在 Xcode 中打开 ios/YourAppName.xcodeproj
2. 在左侧的项目导航器中右键单击您的应用程序名称，然后单击新建文件...
3. 为项目创建一个空的 Swift 文件（确保在添加时选择了 Your App Name 目标）
4. 当 Xcode 询问时，按 Create Bridging Header，然后不要删除 Swift 文件。重新运行你的构建。

This should fix the problem

这应该可以解决问题

回答by Nathan

Apparently for pure objective-c projects you will need to add this $(TOOLCHAIN_DIR)/usr/lib/swift/$(PLATFORM_NAME)to the library search pathsof your target. This worked for me when I was including a library written in swift to a project in objective-c

显然，对于纯objective-c 项目，您需要将其添加$(TOOLCHAIN_DIR)/usr/lib/swift/$(PLATFORM_NAME)到目标的库搜索路径中。当我将一个以 swift 编写的库包含在 Objective-c 的项目中时，这对我有用

回答by AlVelig

In my case it was a React-Native project after adding a Swift Pods library. Maybe just the step 2 can work:

就我而言，它是添加 Swift Pods 库后的 React-Native 项目。也许只有第 2 步可以工作：

1. Adding a new Swift file and a Brigde header:

1. 添加一个新的 Swift 文件和一个 Brigde 头文件：

1) File -> New -> File

1) File -> New -> File

2) Select Swift File

2) 选择 Swift File

3) Confirm Create Bridging Header

3) 确认 Create Bridging Header

1. Go to Build Settingsand set Always Embed Swift Standard Librariesto YES

2. 转到Build Settings并设置Always Embed Swift Standard Libraries为YES

回答by Aleksey Gotyanov

For XCode 11 beta 4 Library Search Pathsshould be:

对于 XCode 11 beta 4库搜索路径应该是：

$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)

回答by SudoPlz

Try this workaround https://stackoverflow.com/a/50495316/1658268

试试这个解决方法https://stackoverflow.com/a/50495316/1658268

Basically just add a dummy swift file in your project, and re-run your build.

基本上只需在您的项目中添加一个虚拟的 swift 文件，然后重新运行您的构建。

回答by Ralf Ebert

I've got the same errors when accidentally compiling a project with a Swift 5.0 Snapshot configured in the Xcode preferences ? Components ? Toolchain.

使用 Xcode 首选项中配置的 Swift 5.0 快照意外编译项目时，我遇到了相同的错误？成分 ？工具链。

回答by Jimmy Sorza

if you come from lottie-react-native install instructionsjust add use_frameworks!to podFile #536 (comment)

如果您来自lottie-react-native 安装说明，只需添加use_frameworks!到 podFile #536（评论）

回答by hakiko

https://stackoverflow.com/a/56187043/1848929works like a charm.

https://stackoverflow.com/a/56187043/1848929就像一个魅力。

Just create empty swift file on your project then build your project. Thats it.

只需在您的项目上创建空的 swift 文件，然后构建您的项目。就是这样。

回答by leolmq

@AlVelig 's answer worked for me.

@AlVelig 的回答对我有用。

My case is a Flutter Project, and I add a package (searchable_dropdown), which is write by Swift.

我的案例是一个 Flutter 项目，我添加了一个包（searchable_dropdown），它是由 Swift 编写的。

The output warning is:

输出警告是：

Could not find auto-linked library 'swiftObjectiveC'

找不到自动链接库“swiftObjectiveC”

Could not find auto-linked library 'swiftCore'

找不到自动链接的库“swiftCore”

......

......

回答by Amir Ardalan

I only forget to Add the new Framework to my pod file :)

我只是忘记将新框架添加到我的 pod 文件中:)

 target 'Data' do
inherit! :search_paths
 pod 'AlamofireObjectMapper', '~> 5.2'

end

结尾