Traits from Krzysztof Zablocki is an open source library allowing you to modify the design and behavior of a native iOS app in real time from Xcode.
With traits you can modify the design of your native apps in real time and see the changes without needing to re-compile. Both code and interface builder changes are supported, and all this can be done with minimal code changes within your app.
This animation from the readme shows Traits in action:
You can read more about Traits on the Merowing site.
You can find Traits on Github here.
The new Injection II app is utilized for the live code changes.
A great library to speed up native app development.
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