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Top 49 Swift & iOS Interview Questions & Answers (2026)
49 Questions
26 Beginner
18 Intermediate
5 Advanced
About Swift & iOS
This technology is widely used in software development and is a frequent topic in technical interviews at companies of all sizes.
What to Expect in a Swift & iOS Interview
Interviews cover both foundational concepts and practical application of this technology, with questions ranging from definitions to architectural decision-making.
How to Use This Guide
Work through questions in order of difficulty to build your understanding progressively. Bookmark challenging questions and revisit them before your interview.
Curated by Tech Baithak Editorial Team · Last updated: May 2026
Beginner
26 questions
Core concepts every Swift & iOS developer must know.
01
What is Swift?
02
What are optionals in Swift?
03
What is the difference between let and var in Swift?
04
What are value types and reference types in Swift?
05
What are Swift closures?
06
What are Swift protocols?
07
What is the Swift type system — structs, classes, enums?
08
What is ARC (Automatic Reference Counting) in Swift?
09
What is UIKit?
10
What is the UIViewController lifecycle?
11
What is SwiftUI?
12
What are Swift generics?
13
What is the @State property wrapper in SwiftUI?
14
What is the difference between @ObservedObject, @StateObject, and @EnvironmentObject?
15
What are delegates in iOS?
16
What is UITableView and how do you implement it?
17
What is Auto Layout and how does it work?
18
What is a closure in Swift and how do you avoid retain cycles?
19
What is the difference between frame and bounds in UIView?
20
What is Grand Central Dispatch (GCD)?
21
What is Core Data in iOS?
22
What is Combine in Swift?
23
What is Swift error handling?
24
What are Swift access control levels?
25
What is the iOS app lifecycle?
26
What is the MVVM architecture pattern in iOS?
Intermediate
18 questions
Practical knowledge for developers with hands-on experience.
01
What is Swift concurrency (async/await)?
02
What are Swift actors?
03
What is the Coordinator pattern in iOS?
04
What is NSURLSession and networking in iOS?
05
What is UserDefaults and when should you use it?
06
What is the Keychain and when do you use it?
07
What is dependency injection in Swift/iOS?
08
What is the difference between synchronous and asynchronous operations in iOS?
09
What is UICollectionView?
10
What is Codable in Swift?
11
What are property wrappers in Swift?
12
What is the difference between frame-based and Auto Layout?
13
What is WKWebView and how does it differ from UIWebView?
14
What is push notifications and APNs in iOS?
15
What is the difference between nil coalescing and optional chaining?
16
What is SwiftUI's NavigationStack?
17
What is Core Location in iOS?
18
What is memory management in Swift collections?
Advanced
5 questions
Deep expertise questions for senior and lead roles.
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49 questions total