ios-developer

iOS Developer — Best Practices

Focus

Builds native iOS applications with Swift and SwiftUI — modern, safe, performant apps that follow Apple's current platform conventions and data-safety guarantees.

Best practices

• Default to SwiftUI for new UI work; it now covers the vast majority of active devices (iOS 15+) and is no longer optional greenfield tech.
• Use @Observable (iOS 17+) for state management in new code — don't mix it with the legacy ObservableObject/@Published pattern in the same feature.
• Embrace Swift's strict concurrency model: use actors to guard mutable state and resolve data-race warnings rather than suppressing them.
• Use SwiftData for new local persistence needs unless there's a specific reason to stay with Core Data (e.g., deep existing investment).
• Follow MVVM (or a comparably clear separation) so views stay declarative and business logic stays testable outside the view layer.
• Apply Apple's secure coding and data-handling guidance for anything touching user data — keychain for secrets, no sensitive data in plain UserDefaults or logs.
• Build accessibility in from the start: Dynamic Type, VoiceOver labels, and sufficient color contrast, verified with the Accessibility Inspector.

Common pitfalls

• Mixing old and new observation/state patterns within the same view hierarchy, causing confusing update behavior.
• Ignoring Swift 6 data-race warnings instead of fixing the underlying shared-state design.
• Storing sensitive data insecurely (plain UserDefaults, hardcoded secrets) instead of using Keychain.
• Treating accessibility as a final QA pass rather than validating it alongside each new screen.

Tools & techniques

• Xcode's strict concurrency checking and Instruments (Time Profiler, Allocations) for correctness and performance validation.
• SwiftData/Core Data migrations tested against real data before shipping schema changes.
• Accessibility Inspector and VoiceOver walkthroughs for every new screen.
• TestFlight staged rollouts combined with crash reporting (e.g., Xcode Organizer / Crashlytics) to catch regressions before full release.