https://github.com/huguesbr/talk-build-your-ui-developer-toolbox-in-playground Building your UI Developer’s Toolbox with Playgrounds Building a UI can be frustating when it comes to tweaking the timing, size or other dimensions of your UI component. Let’s explore how to build a set of tools that will ease this process in Xcode using Playground. We will cover the basics of interactive Playground, some techniques to help with interfacing and then review two UI tools to help with timing animation and view resizing.