In this recipe, we will create a custom container with a
content. When pressing the title, the content will collapse or expand.
We will explore the layout animation API for this example, as it will help us to accomplish our goal in a few steps only.
Let's start by creating a new app, using the React Native CLI. We will call it
CollapsibleApp, but feel free to use any other name.
Once we have created the app, let's create two files at the root of the project,
src/Panel/index.js. These are the only two files we will be working on.
index.ios.jsfile; remove the existing code and add the following to bootstrap the app: