If you have one .podspecfor your library, you can use cocoapods-playgrounds to create a playground that should work.
$ gem install cocoapods-playgrounds
$ pod playgrounds Restofire.podspec
It seems that the plugin has preliminary support for Carthage projects.
The plugin creates a new folder inside the project folder with the following structure:
RestofirePlayground
├── Podfile
├── Podfile.lock
├── Pods
│ ├── Alamofire
│ ├── Headers
│ ├── Local\ Podspecs
│ │ └── Restofire.podspec.json
│ ├── Manifest.lock
│ ├── Pods.xcodeproj
│ └── Target\ Support\ Files
│ ├── Alamofire
│ ├── Pods-TidalPlayground
│ └── Restofire
├── Restofire.playground
├── Restofire.xcodeproj
└── Restofire.xcworkspace
, , , RestofirePlayground, .