Day 2 iOS Technical Questions (Updated for 2025)
- qmshahzad
- Jun 28, 2025
- 3 min read
1. Swift (iOS 18 Update):Q: What’s new in Swift 5.11 and how does it affect your development?A: Swift 5.11 brings better compile-time performance, enhanced ownership model, and early support for Apple’s AI APIs (@Model annotations). You can write cleaner code with better memory efficiency and prepare for AI SDK integration in iOS 18.
2. SwiftUI (iOS 18):Q: What’s new in SwiftUI 6 (iOS 18)?A: SwiftUI 6 introduces:
Built-in AI-assisted modifiers
Enhanced live previews
New layout APIs (GridStack, FlowLayout)
Native support for Material 4 design principles
Real-time design collaboration with Xcode 16 beta
3. UIKit:Q: How do you manage state restoration in UIKit apps?A: Implement application(_:shouldSaveApplicationState:) and application(_:shouldRestoreApplicationState:) in AppDelegate, and override encodeRestorableState(with:)and decodeRestorableState(with:) in view controllers to save and restore UI state.
4. Core Data:Q: What is the difference between NSPersistentContainer and NSManagedObjectContext?A: NSPersistentContainer sets up the Core Data stack and manages the context. NSManagedObjectContext is used for performing fetches, inserts, updates, and deletes. Use .viewContext for main-thread UI operations and newBackgroundContext() for background tasks.
5. NFC:Q: How can iOS apps using NFC be secured against unauthorized reads/writes?A: Use tag-specific security (e.g., password-protected MIFARE tags), validate tag identity with UID or cryptographic methods, and apply app-level logic to prevent unauthorized access. iOS also requires user interaction to start a session.
6. Data Structures:Q: How do you implement a Least Recently Used (LRU) cache in Swift?A: Use a combination of Dictionary for O(1) access and Doubly Linked List for O(1) updates/removals. This data structure is often used in image caching and memory management.
7. In-App Purchases:Q: What’s new in StoreKit 3 and how does it help developers?A: StoreKit 3 (2025) includes:
Simplified APIs
Better support for server notifications
Improved receipt validation
Native subscription offers and churn prediction
8. Notifications:Q: How do you implement notification actions (custom buttons in notifications)?A: Define UNNotificationAction, group them into a UNNotificationCategory, and register it with UNUserNotificationCenter. Then assign the category ID to the notification content.
9. Firebase / Firestore:Q: How do Firestore security rules work with subcollections?A: Firestore rules don’t automatically apply to subcollections. You must explicitly define rules for each path or use wildcards like match /users/{userId}/posts/{postId} to secure nested structures.
10. Storyboard:Q: What’s the best way to manage complex storyboard-based projects?A: Use multiple storyboards (modular structure), reference via Storyboard References, assign unique Storyboard IDs, and load via instantiateViewController(withIdentifier:).
📡 Apple & iOS News — June 2025
iOS 18 Beta: Focus on AI integration, context-aware Siri, and system-wide smart actions
Xcode 16 Beta: Collaborative live previews, new debug timeline for performance tracing
SwiftUI 6: Support for reusable layout definitions and AI-based design assistant
Apple Developer Program now allows limited test deployments via “Private Share Links”
💼 HR Questions
Q: How do you handle feedback you disagree with?A: I listen first, ask clarifying questions, and try to understand the perspective. If I still disagree, I present data or alternatives respectfully and align with team goals.
💡 Personality Question
Q: What’s your personal learning strategy with fast-changing tech like Swift and Firebase?A: I dedicate weekly time for hands-on exploration, follow Apple and Firebase blogs, subscribe to technical newsletters, and contribute to side projects to apply new features.
📁 Project Management
Q: How do you estimate timelines for features you’ve never built before?A: I break the feature into smaller, known components, estimate each part, add buffer time, and validate with the team or spike tasks. I also communicate that it’s an estimate, not a deadline.
🧑🤝🧑 Team Management
Q: How do you balance junior developer growth with project deadlines?A: I assign small production tasks to juniors, review code together, and ensure they shadow seniors during sprints. I avoid putting pressure by pairing them with mentors while meeting client timelines.
Have a mobile app idea or stuck in development?Get expert help with iOS, SwiftUI, Flutter, Firebase, and more — contact me at qmshahzad@yahoo.com.
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