I came across a YouTube video of someone explaining how to create an animated tab bar. The final result is really nice but the code is... well, hacky as hacky can be. It lacks structure, it's full of duplicated code, has lots of index-juggling, and calls to DispatchQueue.main.async() to avoid changing the view's state while it's being rendered by SwiftUI. In summary, it's the sort of hack that is unacceptable in a professional setting.
So, I decided to give it a go and try to replicate the effect using well-written code that is easy to read and reasonably easy to understand and maintain. The result appears below.
It doesn't replicate the YouTube video's result exactly but the differences are minor and easily fixable. Basically, I would have to use a shape other than a Circle and animate its motion vertically as well as horizontally.
TabBarExample2 is available under the MIT license. See the LICENSE file for more info.