Add container visualization for accessibility snapshots#278
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Jan 27, 2026
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drawHierarchy(afterScreenUpdates:true) can trigger safe area layout changes that shift UICollectionView-backed content (e.g. List cells). When parsing happened after rendering, the parser read frames from a different layout state than what the image captured. Fix: parse the accessibility hierarchy before rendering the snapshot image, so drawHierarchy captures the same layout state the parser read. Also updates the test helper to accept a configuration parameter and adds iOS 26.4 to tested device configs. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
When showContainers is enabled in the configuration, the legend renders a hierarchical view that groups elements by their accessibility containers using dashed borders and container badges. New files: - HierarchyColorAssignment: assigns color indices to hierarchy nodes - ContainerLegendEntryView: dashed-border legend entry with badge - HierarchyLegendView: recursive hierarchical legend renderer - ContainerDemo: demo using SemanticGroupWrapper for real UIKit containers Changes: - AccessibilitySnapshotConfiguration: add showContainers flag - ParsedAccessibilityData: add hierarchy tree (not just flat markers) - SwiftUIAccessibilitySnapshotView: swap legend based on showContainers - SwiftUIAccessibilitySnapshotContainerView: pass hierarchy through The snapshot area (image + overlays) is identical regardless of showContainers — only the legend content changes. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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drawHierarchyInRect renders content with safe area offsets applied, causing a ~68pt misalignment between overlay positions and rendered content. renderLayerInContext renders the layer tree directly without safe area effects, producing correctly aligned overlays. Also updates HierarchyColorAssignment to use traversal-order-based element indexing so legend colors match overlay colors, and re-records all iOS 26.4 reference images with the corrected rendering mode. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Container badges now display the container's label, type, or identifier instead of just a number. Semantic groups show "label: value" when both are present, or just the label/value/identifier individually. Other container types show their type name (List, Landmark, Tab Bar, etc.). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Supersedes previous container visualization attempts on this branch with a clean rebuild from main.
Summary
showContainersconfiguration flag)Details
Overlay alignment fix
drawHierarchy(afterScreenUpdates:true)can trigger safe area layout changes that shiftUICollectionView-backed content. When parsing happened after rendering, the parser read frames from a different layout state than what the image captured. Fix: parse before rendering.Container legend
When
showContainersis enabled, the legend renders a hierarchical view that groups elements by their accessibility containers using dashed borders and container badges. The snapshot area (image + overlays) is identical regardless ofshowContainers— only the legend content changes.New types:
HierarchyColorAssignment— assigns color indices to hierarchy nodesContainerLegendEntryView— dashed-border legend entry with badgeHierarchyLegendView— recursive hierarchical legend rendererDemo includes
SemanticGroupWrapper— a lightweightUIViewRepresentablethat setsaccessibilityContainerType = .semanticGroupsince SwiftUI has no native equivalent.Test plan
drawHierarchyInRectandrenderLayerInContext🤖 Generated with Claude Code