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iOS 27 gives AsyncImage more control over remote image loading with URLRequest support for custom headers, cache policies, and timeouts, plus the ability to provide a custom URLSession across a SwiftUI view hierarchy.

Reorder items within and between custom SwiftUI containers, and build selection-aware multi-item drag and drop interactions with the new APIs in iOS 27.

SwiftUI now includes CrossFadeNavigationTransition, a built-in cross-fade navigation transition, and AnyNavigationTransition, a type-erased wrapper that allows transitions to be selected dynamically at runtime.

iOS 27 extends support for swipe actions beyond List to any scroll container using the new swipeActionsContainer() modifier.

SwiftUI's @State changes from a property wrapper to a macro in Xcode 27, gaining lazy evaluation of the initial value and fixing unnecessary @Observable model initialization on view recreation.