iOS 27.1

Developer Updates

Xcode 27.1: Catalyst Build Errors and Simulator Gaps

Xcode 27.1 ships Swift 6.4 and the iOS 27.1 SDKs. See the Mac Catalyst compile errors, missing run destinations, iPhone Duo Simulator…

October 28, 2026

Independent, tested fixes for Xcode errors, Swift & SwiftUI, App Store Connect, iOS and macOS problems. Built from real error messages and Apple’s own release notes.

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iOS 27.1

Xcode 27.1: Catalyst Build Errors and Simulator Gaps