Did anything change in regards to custom traits in iOS 26?
Asked on 2025-07-03
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In iOS 26, there is a new UI trait called HDRHeadroom Usage that allows developers to monitor when HDR content should fall back to SDR. This is part of the expanded behavior in iOS 26 where UIImageView's intelligent fallback from HDR to SDR is extended to video and custom content. This change allows custom traits to participate in the HDR to SDR fallback process, enhancing the dynamic image experiences in apps. For more details, you can refer to the session What’s new in UIKit (19:41).
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