iOS Snapshot Testing: Complete Guide for UIKit and SwiftUI Apps

Master visual regression testing, prevent UI bugs, and ship pixel-perfect apps across all iOS frameworks

Let’s be honest for a second. You’ve probably shipped a visual bug this year. Maybe it was a button that disappeared on iPhone SE. Maybe some text got cut off when users cranked up their font size. Or perhaps your beautiful dark mode implementation turned into a black hole of invisible elements. 🕳️

The worst part? Your unit tests were green. Your code review was approved. Everything looked perfect in the simulator. But somewhere out there, a user is trying to tap a button that’s hiding behind another view, muttering “this app is broken” under their breath.

Welcome to the wonderful world of visual bugs! 🎭

Unlike logic bugs that crash your app spectacularly (at least you know they exist), visual bugs are sneaky little gremlins. They don’t throw exceptions. They don’t trigger crash reports. They just… make your app look terrible and frustrate users silently.

Here’s the thing though — we’ve been testing iOS apps all wrong. We obsess over unit testing our business logic (rightfully so!), we write integration tests for our networking layer, but when it comes to the thing users actually see and interact…