This is definitely a supplement to reviewing the actual code. When you’re doing iOS UI development, it is often unclear from the code changes what the actual UI change looks like, especially if the app is developed using storyboards or XIBs. It gives the coder another way to help the reviewer understand what changed in a visual way.
It isn’t perfect: it can suffer from “works on my machine” syndrome, and the coder could also fudge the preview to look good even if the change isn’t. In the latter case, you’ve got a bigger problem than code review!
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