feat: snackbar UIKit implementation

[daniel-dumortier]

Changes description

Implementation of the Vitamin snackbar for UIKit

Context

The snackbar is a component that allows to display a short message on the screen, this PR aims to provide this component. fixes #21

It provides two way of displaying a Snackbar :

• by building it, and placing it on the screen
• by using an extension of ÙIViewController that will ease the display by handling the placement and the unicity of snackbar

Checklist

• [x] Make sure you are requesting to pull a topic/feature/bugfix branch. Please, don't request directly from your main!
• [x] Check commits & PR names matches our requested structure. It must follow the https://www.conventionalcommits.org pattern.
• [x] Check your code additions will fail neither code linting checks.
• [x] I have reviewed the submitted code.
• [x] I have tested on an iPhone device/simulator.
• [x] I have tested on an iPad device/simulator.
• [x] If it includes design changes, please ask for a review with a core team designer.

Does this introduce a breaking change?

• No

Screenshots

iPhone

iPad

Other information

This component has been asked by Domyos team for an upcoming feature

[daniel-dumortier]

Sorry, after re-reading the doc, I noticed my implementation lacked a feature : optional action should be triggerable when tapping the snackbar. I added that in this last commit. Can you just review this last point ? (I hope I did not made new typos, I carefully read my comments and docs, sorry in advance if i missed again some typos) Thanks !

[daniel-dumortier]

Sorry, but after further testing, noticed that the maxWidth did not work properly.

Furthermore, with the new signature on UIViewController's extension, the declaration of maxWidth was not clear, because it could be done on VitaminSnackbar or as method parameter, and both had not the same meaning, so purpose of each maxWidth was not really clear.

I changed :

• the way constraints are defined and applied
• maxWidth declaration and storage to make it optional
• messageLabel preferredMaxLayoutWidth refreshing when maxWidth changes
• UIViewController's method signature to remove maxWidth parameter
• README to reflect changes

After that, I needed to rearrange the code, to remain under the limit of 400 lines per file, to please Swiflint ;)

Hope this will be the last version, sorry for all this back and forth ;)

[sonarcloud[bot]]

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