SwiftMonkey is an open source framework for randomly testing an apps user interface from Zalando.
SwiftMonkey is ideal for avoiding unexpected issues with your apps user interface as it will stress test your app with touches and swipes. SwiftMonkey integrates with the Xcode UI testing framework and also allows you to visual the touches.
This animation from the readme shows SwiftMonkey in action:
You can find SwiftMonkey on Github here.
A nice library from random UI testing.