Checking out an existing iOS app source code from Github into Xcode to practice writing Appium code. Any recommended app to use?

I’d like to checkout an existing iOS app source code from Github into Xcode to practice writing Appium code. Does anyone have a recommended app to use? Could you please provide a Github link?
(I already tried a couple of sample test apps I chose randomly. They are not building in Xcode. That’s why I am asking which test app to choose. :slight_smile: )

I prefer a swift 3 app.

Found a good one myself. https://developer.apple.com/library/content/samplecode/UICatalog/UIKitCatalogiOSCreatingandCustomizingUIKitControls.zip