Uncovering and Solving a SwiftUI Text Animation Bug

Introduction

When working with SwiftUI, developers often encounter unexpected behaviors that can be challenging to debug. Recently, my team in klivvr faced an interesting issue with text view animations that led us down a path of discovery and ultimately revealed a long-standing framework bug.

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The Problem

We encountered a situation where text animations weren’t working as expected in SwiftUI. Specifically, the offset animation on Text views wasn’t functioning properly. Here’s what we initially tried:

//To give you more info our app support iOS 15 and above

// Attempt 1: Using traditional animation modifier
Text("Hello, world!")
    .offset(y: animate ? 0 : 100) // Doesn't work
    .animation(.default, value: animate)

// Attempt 3: Using withAnimation
withAnimation {
    // Text animations still failed to work
}

My team memeber Eslam spent considerable time trying different approaches and in the end we…