Priyanshu Singh

I'm happy to announce that I resigned from my job. Because sometimes, the biggest promotion is choosing yourself 🤌 Here's to new challenges, bigger dreams, and building what's next....

Hot take: AI didn’t make bad developers. It exposed them. If your job was just: “convert requirements → write SwiftUI → call API” Yeah… AI can do that now. The real problem? Most devs never went beyond that. They never learned: → why things break → how systems behave → what happens in production So now it feels like “AI is replacing developers” No. It’s replacing surface-level work. The uncomfortable question: Are you building systems… or just typing code?

Save this before you scroll. This is the ONLY iOS interview questions you actually need. I wasted years thinking every interviewer had their own syllabus… Turns out they all ask the 𝘴𝘢𝘮𝘦 things, just in different accents. So I broke everything down, removed the fluff, and distilled the entire iOS interview world into one clean list. No chaos. No guesswork. Just the exact topics companies repeat in loops. If you can answer these 100 questions, you don’t walk into interviews with confidence… you walk in prepared to win. Swift & Language – 1 to 20 1. What’s the difference between struct and class 2. Value type vs reference type 3. How ARC works 4. What are strong, weak, unowned 5. What causes retain cycles 6. What are property wrappers 7. What is Codable 8. Difference between map, flatMap, compactMap 9. What are generics and why use them 10. What is a protocol 11. Protocol vs class inheritance 12. Associated types in protocols 13. What are extensions used for 14. What are static vs class methods 15. What is a closure 16. Escaping vs non-escaping 17. Autoclosure meaning 18. What is inout 19. What is optional chaining 20. What are computed vs stored properties Concurrency – 21 to 30 1. What is GCD 2. Difference between sync and async 3. Serial vs concurrent queues 4. What is a race condition 5. What is a deadlock 6. How DispatchGroup works 7. What is OperationQueue 8. How async-await works 9. What are actors 10. What the MainActor does Memory Management – 31 to 40 1. How ARC allocates and frees memory 2. What weak references do 3. What unowned references do 4. Strong reference cycles in closures 5. Capture list usage 6. What causes memory leaks 7. How to detect leaks using Instruments 8. Retain cycle examples in MVVM 9. Memory warning handling 10. Reference counting under the hood UIKit & SwiftUI – 41 to 60 1. View lifecycle in UIViewController 2. App lifecycle in iOS 3. Difference between frame and bounds 4. Auto Layout basics 5. Constraints vs frames 6. How table view cell reuse works 7. Diffable data source 8. What is compositional layout 9. SwiftUI view lifecycle 10. @State vs @Binding 11. @ObservedObject vs @StateObject 12. Environment values 13. NavigationStack basics 14. How SwiftUI diff engine works 15. View identity in SwiftUI 16. LazyVStack and LazyHStack 17. Scroll performance best practices 18. Rendering pipeline in SwiftUI 19. UIKit vs SwiftUI architecture differences 20. When to mix SwiftUI + UIKit Networking – 61 to 70 1. URLSession flow 2. DataTask vs DownloadTask 3. Decoding JSON using Codable 4. Handling errors in networking 5. What is HTTP caching 6. What are URLRequests 7. REST vs GraphQL 8. Handling status codes 9. Retry mechanism 10. Debouncing network calls here I reached content limit , check Priyanshu Singh for next part or comment PDF and I'll DM you a detailed PDF link with answers !! #iOS #swift