airbnb/lottie-ios
Reviewed against Rams quality heuristics: accessibility, color, typography, spacing, components, motion, UX, and craft.
12 files reviewed·July 29, 2026
Top fix
Keep enforcing strict layer separation as new renderers are added
More findings
- Public API surface stays minimal with no leaked internals
- No debug scaffolding or dead code found across reviewed files
Verdict
A rendering library with zero visual opinions of its own, and that restraint is exactly the point. The only risk is invisible: nothing here forces future contributors to keep the API this clean.
Files Rams reviewed
Sources/Private/EmbeddedLibraries/EpoxyCore/Views/ViewType.swift
Example/Example/AnimationListView.swift
Example/Example/AnimationPreviewView.swift
Example/Example/ControlsDemoView.swift
Example/Example/LottieViewLayoutDemoView.swift
Example/Example/SwiftUIInteroperabilityDemoView.swift
Sources/Private/EmbeddedLibraries/EpoxyCore/SwiftUI/EpoxyableView+SwiftUIView.swift
Sources/Private/EmbeddedLibraries/EpoxyCore/SwiftUI/SwiftUIView.swift
Sources/Private/EmbeddedLibraries/EpoxyCore/SwiftUI/UIView+SwiftUIView.swift
Sources/Private/EmbeddedLibraries/EpoxyCore/SwiftUI/UIViewConfiguringSwiftUIView.swift
script/test-carthage/CarthageTest/ContentView.swift
Example/Example/LottieSwitchRow.swift
Working well
- The rendering-engine and loop-mode menus use native `Menu`/`Picker`-style option lists with a checkmark on the selected value, which gives VoiceOver correct selection semantics for free instead of hand-rolling toggle buttons.
- Using .frame(maxWidth:) / .frame(maxHeight:) / .resizable() / automatic sizing side by side in one HStack is a clear, minimal way to demonstrate layout modes for a component library.
- Using List with navigationTitle is the idiomatic SwiftUI pattern for a settings/demo catalog screen, giving free large-title collapse and correct safe-area handling.
- Using @ViewBuilder content in the generic Demo wrapper keeps the show/hide toggle reusable across both demo sections without duplicating layout code.
Scored July 29, 2026 with Rams Engine v0.0.3 · Engine changelog
This page is an automated design review of airbnb/lottie-ios’s UI code: 12 files read against 258 versioned rules covering accessibility, color, typography, spacing, components, UX, motion, and craft. The score is out of 100; any confirmed critical issue caps it at 59.
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