<ul data-eligibleForWebStory="true"><li>Apple has introduced automatic observation tracking in UIKit and AppKit in iOS 18/macOS 15 to enable views to update when properties change.</li><li>The feature, akin to SwiftUI's automatic view updates, can be enabled with a simple plist entry.</li><li>Key UIKit and AppKit methods supporting this feature include viewWillLayoutSubviews(), layoutSubviews(), viewWillLayout(), and layout().</li><li>Developers can now use @EnvironmentObject-like behavior in UIKit to easily access objects throughout the app.</li><li>The keys for enabling this tracking are UIObservationTrackingEnabled and NSObservationTrackingEnabled.</li><li>It automatically observes changes to object properties and triggers view updates accordingly.</li><li>However, it seems limited to fixed sets of objects in views and might require additional handling for dynamic content.</li><li>Comparisons to KVO suggest that changes impacting displayed objects' eligibility may need manual observation implementation.</li></ul>

Automatic Observation Tracking in UIKit and AppKit

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