SnapKit VS FlexLayout

I’ve been using Xcode for the last 13 years or so, and my advice is - us whatever is comfortable and makes sense to you. I use all 3: code*, storyboard and interface builder (xib). They all have their strengths and weaknesses. Storyboards are nice for quick simple screens with table/collection views and cell templates, but sucks when working in a team (merge conflicts on xml files is not fun). Interface builder has the advantage of being really quick for standalone viewcontrollers and views (after some code that takes away the boilerplate part of loading views from nibs) and minimized the git issues. And code is fun when you’re using anchors and frameworks like snapkit (https://github.com/SnapKit/SnapKit) but even when I was doing visual constrains using strings it was fine. Anyway, just try to learn a bit of everything and see what resonates with you. There are no right answers, just preferences.

If you need to use Auto Layout, I recommend using a wrapper SDK like SnapKit https://github.com/SnapKit/SnapKit that is less verbose and less error-prone and assigns translatesAutoResizingMaskIntoConstraints and isActive automatically.

With a library like SnapKit, you can still have the terse, declarative coding style of UIKit. Hell, I once wrote my own poor-man's version of SnapKit on a whim because writing out constraint code manually got tedious.

SnapKit (19k⭐️) has been providing almost the same thing for years. It is already a standard for many companies.

With something like SnapKit (I actually rolled my own poor man's version in like 10 minutes, before learning that SnapKit existed), SwiftUI no longer appeals to me because of it's declarative-style DSL.

SnapKit - Autolayout DSL for iOS & OS X

This. And if you want to learn AutoLayout without the verbosity/complexity of Apple's own APIs, I would look into using SnapKit.

SnapKit - A Swift Autolayout DSL. Language: Swift.

We still wanted to leverage a layout engine that could be performant and easy-to-use. After doing some performance testing with native UIKit, Autolayout, and a few other third-party options, we ended up bringing FlexLayout into the mix, which is a Swift implementation of Facebook’s Yoga layout engine. All RPL components utilize FlexLayout in order to lay out content fast and efficiently. While we’ve enjoyed using it, we’ve found a few touch points to be mindful of. There are some rough edges we’ve found, such as utilizing stack views with subviews that use FlexLayout, that often come at odds with both UIKit and FlexLayout’s layout engines.