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Mobile & games · #xcode
Learn how to diagnose and fix persistent 'Module not found' and linker errors in Xcode by identifying Derived Data corruption and performing a deep cache purge.
Learn how to link a local Swift package into an Xcode app target using filesystem references, validate the build, and recover from common path and resolution errors.
SwiftUI Previews can skip full app deployment, but their build-system subset and environment mocking require careful configuration to avoid misleading iteration.
Learn how to use Xcode Previews and the #Preview macro to isolate SwiftUI components, inject mock state, and simulate environment traits like Dark Mode for faster UI iteration.
A decision guide comparing Xcode’s new and legacy build systems, explaining trade‑offs, and showing how to opt out and verify the change.
Stop duplicating Xcode schemes for every environment. Learn how .xctestplan files let you manage test targets, parallel execution, and sanitizers in a single, maintainable configuration.
Learn how Xcode Test Plans let you lock down test configurations—language, locale, sanitizers, parallelism—so your CI runs behave the same on every machine.
SwiftUI Previews can collapse the compile-run-wait loop for UI work—if you structure views for them. A worked example with dark mode and Dynamic Type variants, plus the limits to respect.
SwiftUI previews fail in ways the simulator never does because they run a minimal, constrained build of your app. Here's why Apple made that trade-off and how to design views that preview well.