SwiftTweaks is an open source library that allows tweaking of your user interface on device from Khan Academy. This allows you to try out those changes without needing to recompile.
SwiftTweaks allows you to set up different variables for tweaking which when bring up the Swift Tweak interface you can then tweak those variables to make sure your UI looks right when on device.
SwiftTweaks was inspired by FBTweaks, but was designed specifically for apps written in Swift.
This animation from the readme shows SwiftTweaks in action:
You can find SwiftTweaks on Github here.
A nice time saving library for tweaking user interfaces.
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