How to use frameworks imported with carthage in swift playground

This stopped working at some point. Sigh

What I do now is

• Create a macOS > Command Line Tool.
• Create a Cartfile with github "ReactiveX/RxSwift" and run carthage update --platform iOS
• Go to the command line tool target and add the frameworks from Carthage/Build/iOS in Linked frameworks and Libraries
• Add the playground files.

At this point I’m able to run the playground files.

🤷🏻‍♂️

A playground has access to external frameworks if it is part of a workspace that builds a target configured to access those frameworks.

If you want to add a playground to an existing carthage project, you only need to save the project as a workspace (File > Save as Workspace…), build the target, and you are done.

If you just want to distribute a playground with third party frameworks, you need to create a dummy workspace. Here is a step by step example for a playground with the RxSwift framework:

1. Create a new Xcode project of type Cross-platform > Other > Empty. Name it RxPlayground.
   This will create this structure RxPlayground/RxPlayground.xcodeproj and open a blank Xcode.

2. Download RxSwift with Carthage

   • Create a Cartfile with this line: github "ReactiveX/RxSwift" "swift4.0"
   • Run Carthage with carthage update --platform iOS.

3. Add a playground to the project.

   • Click File > New > Playground…
   • Choose the iOS > Blank template and name it Rx.playground
   • Right click the project node and choose “Add Files to RxPlayground”.
   • Select the Rx.playground and add it.

4. Create a workspace

   • Click File > Save as Workspace…
   • Save as Rx.xcworkspace

5. Copy the frameworks to the products directory.

   • Close the project and open the Rx.xcworkspace
   • Create a Cross-platform > Other > Aggregate. Name it RxAggregate
   • Create a New Run Script Phase with the following content:

    cp -rv "${SRCROOT}/Carthage/Build/iOS/" "${BUILT_PRODUCTS_DIR}/${FRAMEWORKS_FOLDER_PATH}"

At this point, Xcode and the Finder look like this:

Note that Carthage/ and Cartfile.resolved appear when you run Carthage, Without them, your playground will be only a few Ks.

Lastly, build the project (⌘B). Now you can use the framework in your playground:

//: Playground - noun: a place where people can playimport RxSwift_ = Observable<Void>.empty()    .subscribe(onCompleted: {        print("Completed")    })

Sometimes the first time you build (⌘B) Xcode doesn’t notice the new framework (sigh). What I do is click on the target and back to a source file, or re-open the project. I don’t have an explanation why this happens.

In order for the framework to work within a playground, the project that produces the framework must be included in the workspace for your project. So to make this work you need to follow these steps:

1. If your project is not inside a workspace, create a workspace for your project by choosing File > Save As Workspace in Xcode.
2. Drag the .xcodeproj file from the Carthage/Checkouts folder into your workspace.
3. Run the build action on your framework target.

I solved it by copying the built frameworks to the Built Products Directory, where Playgrounds in the workspace also searches for frameworks.Note: you also need to run lipo and strip away unused architectures from the FAT binaries.

See more here:https://github.com/richardnees/CarthagePlaygrounds