Top 93 Interview Question Swift5.


Top 93 Swift 5 Interview Questions



1. Introduction


This is a curated list of the top 93 interview questions for Swift 5. These questions cover beginner to advanced topics, including Swift basics, advanced programming concepts, SwiftUI, and iOS development techniques.


2. General Swift Basics

1. What is Swift, and why is it used?

2. What are the key features of Swift?

3. What is the difference between var and let in Swift?

4. Explain optionals in Swift.

5. What is a closure in Swift?

6. What is a tuple in Swift?

7. What are lazy properties in Swift?

8. Explain the concept of computed properties.

9. What are extensions in Swift, and how are they used?

10. What is a protocol in Swift?

11. What is delegation in Swift?

12. What is the difference between a class and a struct in Swift?

13. What are higher-order functions in Swift?

14. Explain the concept of type inference in Swift.

15. What is the difference between guard and if in Swift?


3. Advanced Swift Concepts

16. What is an enum in Swift, and how is it used?

17. What is an initializer in Swift?

18. What are failable initializers in Swift?

19. Explain error handling in Swift.

20. What is a deinitializer in Swift?

21. What is ARC (Automatic Reference Counting) in Swift?

22. What is the difference between weak and unowned in Swift?

23. Explain the concept of optional chaining.

24. What are Swift literals?

25. What are subscripts in Swift?

26. What is a typealias in Swift?

27. What is a generic in Swift?

28. What is the static keyword in Swift?

29. Explain access control in Swift.

30. What is the difference between open and public in Swift?


4. SwiftUI and Combine Framework

31. Explain the concept of SwiftUI.

32. What is the Combine framework in Swift?

33. What is the difference between @State and @Binding in SwiftUI?

34. What is Codable in Swift?

35. What is the difference between Decodable and Encodable?

36. What is the difference between Any and AnyObject in Swift?

37. What is KeyPath in Swift?

38. What is the use of DispatchQueue in Swift?

39. What are async and await in Swift?

40. Explain the difference between synchronous and asynchronous tasks.


5. Multithreading and Concurrency

41. What is the difference between GCD and OperationQueue?

42. What is a result type in Swift?

43. What are property wrappers in Swift?

44. What is the use of @Published in SwiftUI?

45. Explain the concept of MVVM architecture in SwiftUI.

46. What is the difference between @EnvironmentObject and @ObservedObject?

47. What is Combine’s Publisher and Subscriber?

48. What is the difference between foreground and background threads?


6. Memory Management and Performance

49. Explain the concept of runtime polymorphism in Swift.

50. What is the difference between static and dynamic dispatch?

51. What are nested functions in Swift?

52. What is a memory leak, and how do you avoid it in Swift?

53. Explain the concept of associated types in protocols.

54. What is the use of defer in Swift?

55. What is the difference between @escaping and non-escaping closures?

56. What is the purpose of autoreleasepool in Swift?

57. What is dynamic member lookup in Swift?

58. What are Swift’s Result Builders?


7. Data Persistence and Networking

59. What is the difference between pass-by-value and pass-by-reference?

60. What is the role of Codable in networking?

61. What is URLSession in Swift?

62. What is Swift Package Manager (SPM)?

63. What is the difference between target and module in Swift?

64. Explain the role of @discardableResult.

65. What is a thread-safe operation in Swift?

66. What is Keychain in iOS?

67. What is CoreData in iOS?

68. What is the difference between CoreData and Realm?


8. Design Patterns in Swift

69. What is a singleton in Swift, and how is it implemented?

70. What are @available and @deprecated annotations in Swift?

71. What is a Bridging Header in Swift?

72. Explain the difference between NotificationCenter and Delegation.

73. What are the different ways to persist data in iOS?

74. What is Combine’s flatMap and switchToLatest?


9. UIKit and iOS Architecture

75. What is the difference between a View and a ViewController?

76. What is a SceneDelegate in iOS?

77. What is the difference between UITableView and UICollectionView?

78. What is a Coordinator pattern in iOS?

79. What is the difference between @MainActor and @GlobalActor?


10. Protocol-Oriented and Functional Programming

80. What are the benefits of protocol-oriented programming in Swift?

81. What is a capture list in closures?

82. What is @autoclosure in Swift?


11. Miscellaneous

83. Explain the importance of AppDelegate in an iOS application.

84. What is an asset catalog in iOS?

85. What is Swift’s ABI stability?

86. What is the use of Swift’s @objc attribute?

87. What is a concurrent queue in Swift?

88. Explain Swift’s Dictionary and Set operations.

89. What is the difference between a Playground and an Xcode project?

90. What is the difference between implicit and explicit unwrapping?

91. What is the role of the SceneKit framework in iOS?

92. What is XCTest in Swift?

93. What is the use of Instruments in Xcode?


12. Final Notes


This list of questions provides a solid foundation for preparing for Swift 5 interviews. Make sure to practice coding and explore related frameworks (e.g., UIKit, SwiftUI) to excel in your interviews.



• Swift 5 interview questions

• iOS developer interview preparation

• Common Swift programming questions

• Advanced Swift interview questions

• Top Swift coding questions

• Swift technical interview tips

• Swift 5 Q&A for developers

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