iOS 27 Breaking Changes & Deprecations: Complete Developer Reference

With every major iOS release, Apple retires APIs in favour of modern alternatives. iOS 27, introduced at WWDC 2026, is no exception. This reference collects every deprecated capability from the iOS 27 SDK, organized by impact score, so you can prioritize your migration work before the first public beta.

High-impact deprecations are APIs that appear in many codebases and have no direct drop-in replacement. Low-impact ones are typically niche or already have obvious alternatives in place. Click any entry to see the full detail page including Swift code and gotchas.