Accessibility works seamlessly in ways that even UIKit doesn’t provide. When using the powerful optimization features of Layer Backing (.layerBacked) and Subtree Rasterization (.shouldRasterizeDescendants), VoiceOver can access fine-grained metadata about each element. This is pretty amazing: CALayer doesn’t support accessibility, and rasterization reduces everything to a single flat image.

The AsyncDisplayKit team fundamentally believes in Accessibility, and invested the time to create an innovative system to make this possible with zero developer effort. As a bonus, this also allows Automated UI Testing greater access to the interface.

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