To get Parse to work on the playground, you will need to create an Xcode project and enable the Parse structure. Then, within the framework of this project, you can add a playing field and import the frameworks and code written in this project. Hope this helps.
If you are interested, I did this for the structure I created and created a playground within the project workspace. In this, I import Dollar, which is a custom structure, but I assume you can import Parse, and it should work https://github.com/ankurp/Dollar.swift
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