Important: The iOS SDK is coming soon. It is not available yet, and there is nothing to install today. Until it ships, use the Delivery API from your own server.
The iOS SDK will be a Swift library for iOS apps. It will fetch your workspace's published face lenses and screen effects and draw them in your app. It will follow the same format and drawing rules as the studio's live preview, so it is meant to draw what your designers see in the editor.
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Details may change before the first release. This page will say when the SDK is available.
You can build on the delivery API today:
Swift's Codable ignores fields it doesn't know, which is what you want for the delivery API's answers: new fields can appear at any time.
Codable