Actual interview questions may vary, and it's always a good idea to research and prepare for a wide range of topics.
Set A
1. Explain the concept of dependency injection and how it is used in iOS development.
2. What is the purpose of the Core Animation framework in iOS?
3. How do you handle background location updates in an iOS app?
4. What is the purpose of the NSNotificationCenter class in iOS?
5. Explain the concept of Swift's generics and how they are used.
6. How do you implement biometric authentication (such as Touch ID or Face ID) in an iOS app?
7. What is the difference between synchronous and asynchronous networking in iOS?
8. Explain the concept of Core Graphics and how it is used for drawing and rendering in iOS.
9. How do you handle deep linking and universal links in an iOS app?
10. What is the purpose of the URLSession class in iOS?
11. Explain the concept of Core Data relationships and how they are defined.
12. How do you handle background audio playback in an iOS app?
13. What is the purpose of the Core Motion framework in iOS?
14. How do you implement custom transitions between view controllers in iOS?
15. Explain the concept of Core Location and how it is used for location-based services in iOS.
16. How do you implement a custom interactive transition in iOS?
17. What is the purpose of the Core Animation layer and how is it different from UIView?
18. Explain the concept of Core Bluetooth and how it is used for Bluetooth communication in iOS.
19. How do you implement an in-app purchase in an iOS app?
20. What is the purpose of the AVFoundation framework in iOS?
21. Explain the concept of Core Image and how it is used for image processing in iOS.
22. How do you implement custom push notification handling in an iOS app?
23. What is the purpose of the AVAudioPlayer class in iOS?
24. Explain the concept of Core Text and how it is used for advanced text layout in iOS.
25. How do you implement a custom UICollectionViewLayout in iOS?
26. What is the purpose of the AVPlayer class in iOS?
27. Explain the concept of Core Animation timing functions and how they are used.
28. How do you implement a custom UISearchBar in iOS?
29. What is the purpose of the AVAudioRecorder class in iOS?
30. Explain the concept of Core Graphics blend modes and how they affect rendering.
31. How do you implement bi-directional communication between a watchOS app and an iOS app?
32. What is the purpose of the AVSpeechSynthesizer class in iOS?
33. Explain the concept of Core Graphics coordinate systems and transformations.
34. How do you implement dynamic type for accessible text in iOS?
35. What is the purpose of the Core Graphics path and how is it used for drawing shapes?
36. Explain the concept of Core Data migrations and how they are handled.
37. How do you implement 3D touch in an iOS app?
38. What is the purpose of the Core Graphics context and how is it used for drawing?
39. Explain the concept of Core Animation keyframe animations and how they are defined.
40. How do you implement a custom UIPageControl in iOS?
41. What is the purpose of the Core Graphics mask and how is it used for image masking?
42. Explain the concept of Core Animation layer transforms and how they affect visual properties.
43. How do you implement an interactive map view in an iOS app using MapKit?
44. What is the purpose of the Core Graphics gradient and how is it used for color blending?
45. Explain the concept of Core Animation CAEmitterLayer and how it is used for particle effects.
46. How do you implement a custom UIActivityIndicatorView in iOS?
47. What is the purpose of the Core Graphics pattern and how is it used for texture fills?
48. Explain the concept of Core Animation CAReplicatorLayer and how it is used for repeating animations.
49. How do you implement a custom camera view in an iOS app?
50. What is the purpose of the Core Graphics clipping path and how is it used for masking?
Set B
1. What is the purpose of the UIApplicationDelegate protocol?
2. Explain the concept of Keychain in iOS.
3. What is the difference between a push notification and a local notification?
4. How do you implement data persistence using Core Data?
5. What is the purpose of the AppDelegate class in iOS?
6. Explain the concept of Swift's Optionals and how they are used.
7. What is the difference between a nonatomic and an atomic property in Objective-C?
8. How do you handle background fetch and silent push notifications in iOS?
9. Explain the concept of Interface Builder Outlets and Actions.
10. What is the purpose of a storyboard in iOS development?
11. How do you handle device orientation changes in an iOS app?
12. What are the different types of storage options available in iOS?
13. How do you perform network requests and handle asynchronous data loading in iOS?
14. Explain the concept of view recycling and why it is used in UITableView.
15. What is the purpose of the Core Location framework in iOS?
16. How do you implement a custom animation in iOS?
17. Explain the concept of Key-Value Coding (KVC) in iOS.
18. What is the purpose of Core Graphics framework in iOS?
19. How do you handle user authentication and authorization in an iOS app?
20. What is the purpose of the NSNotificationCenter class in iOS?
21. How do you implement data encryption and decryption in iOS?
22. Explain the concept of Interface Segues in iOS.
23. What is the purpose of the Asset Catalog in Xcode?
24. How do you implement multi-threading and concurrent programming in iOS?
25. Explain the concept of method swizzling in Objective-C.
26. What is the difference between a push segue and a modal segue in iOS?
27. How do you implement a custom gesture recognizer in iOS?
28. Explain the concept of App Extensions in iOS.
29. What is the purpose of the NSFileManager class in iOS?
30. How do you implement Core Animation transitions and effects in iOS?
31. Explain the concept of In-App Purchases in iOS.
32. What is the purpose of the Core Motion framework in iOS?
33. How do you handle user interface localization in iOS?
34. Explain the concept of Auto Layout and how it is used to create adaptive interfaces.
35. What is the purpose of the AVFoundation framework in iOS?
36. How do you implement a custom UIView subclass in iOS?
37. Explain the concept of method dispatch in Objective-C.
38. What is the purpose of the UIPanGestureRecognizer class in iOS?
39. How do you handle memory leaks and retain cycles in iOS?
40. Explain the concept of the Keychain Services API in iOS.
41. What is the purpose of the UIPageViewController class in iOS?
42. How do you implement Core Image filters and effects in iOS?
43. Explain the concept of URLSession and how it is used for network requests.
44. What is the purpose of the UIActivityViewController class in iOS?
45. How do you implement background audio playback in an iOS app?
46. Explain the concept of Core Bluetooth framework in iOS.
47. What is the purpose of the UIStackView class in iOS?
48. How do you implement drag and drop functionality in iOS?
49. Explain the concept of Core Text framework in iOS.
50. What is the purpose of the AVAudioPlayer class in iOS?
Set C
1. What is the difference between atomic and nonatomic properties in Objective-C?
2. Explain the concept of method swizzling and its potential use cases.
3. How do you handle memory management in iOS, and what are the differences between manual memory management and Automatic Reference Counting (ARC)?
4. What is the purpose of the UIApplicationDelegate protocol, and what are some of its methods?
5. Explain the concept of KVO (Key-Value Observing) and how it is used in iOS development.
6. What is the difference between synchronous and asynchronous network requests, and when would you use each approach?
7. How do you implement data persistence in iOS, and what are the differences between Core Data and Realm?
8. What is the purpose of GCD (Grand Central Dispatch), and how do you use it for concurrent programming?
9. Explain the concept of protocol-oriented programming (POP) in Swift and its advantages over traditional inheritance.
10. How do you handle multithreading in iOS, and what are the common thread synchronization techniques?
11. What is the purpose of the NotificationCenter in iOS, and how do you use it for inter-component communication?
12. Explain the concept of generics in Swift and provide an example of how they are used in practice.
13. What are the benefits of using Codable for JSON serialization and deserialization in Swift?
14. How do you handle localization and internationalization in an iOS app?
15. What is the purpose of the Keychain in iOS, and how do you use it for secure data storage?
16. Explain the concept of deep linking and how it can be implemented in an iOS app.
17. How do you handle background tasks and background execution in iOS?
18. What is the purpose of Auto Layout, and how do you use it to create adaptive user interfaces?
19. Explain the concept of view recycling and how it is used in UITableView and UICollectionView.
20. How do you handle user input and gestures, such as taps, swipes, and pinches, in iOS?
21. What are the different types of app extensions available in iOS, and how do you implement them?
22. Explain the concept of Core Animation and its key components, such as CALayer and CABasicAnimation.
23. How do you implement push notifications in an iOS app, and what are the requirements for sending and receiving them?
24. What is the purpose of the Core Graphics framework, and how do you use it for custom drawing and rendering?
25. Explain the concept of NSURLSession and its different session configurations.
26. How do you implement user authentication and authorization in an iOS app?
27. What are the different methods for handling data transfer between view controllers in iOS?
28. Explain the concept of Core Data, its main components, and how you can perform CRUD operations.
29. How do you implement user interfaces programmatically without using Interface Builder?
30. What are the different types of storage options available in iOS, such as UserDefaults, File System, and Key-Value Store?
31. Explain the concept of dependency injection and its benefits in iOS development.
32. How do you handle app states, such as foreground, background, and suspended, in iOS?
33. What is the purpose of the AVFoundation framework, and how do you use it for multimedia playback and recording?
34. Explain the concept of NSURLSessionDataTask and NSURLSessionDownloadTask, and when would you use each of them?
35. How do you handle user interface testing and automation in iOS using frameworks like XCTest and UI Testing?
36. What is the purpose of Core Location, and how do you use it for accessing the device's location services?
37. Explain the concept of image caching and lazy loading in iOS, and how do you implement them?
38. How do you implement a custom transition between view controllers using UIViewControllerTransitioningDelegate?
39. What is the purpose of Core Animation keyframe animations, and how do you define and animate them?
40. Explain the concept of Core Bluetooth, and how do you use it for Bluetooth communication between devices?
41. How do you implement unit testing in iOS using frameworks like XCTest and Quick/Nimble?
42. What is the purpose of Core Image, and how do you use it for image filtering and manipulation?
43. Explain the concept of JSON Web Tokens (JWT) and how they are used for authentication and authorization in iOS apps.
44. How do you handle local notifications in iOS, and what are the different types of triggers available?
45. What is the purpose of Core Text, and how do you use it for advanced text layout and rendering?
46. How do you implement asynchronous image loading and caching using libraries like SDWebImage or Kingfisher?
47. Explain the concept of Core Graphics blend modes and how they affect color blending and composition.
48. How do you implement dark mode support in an iOS app, and what are the best practices for adapting the user interface?
49. What are the differences between a framework and a library in iOS development?
50. Explain the concept of Core Graphics coordinate systems and transformations, such as scaling, rotation, and translation.
Set D
1. Explain the concept of Core Animation layer hierarchy and how it affects the rendering of views in iOS.
2. How do you implement custom transitions between tabs in a UITabBarController?
3. What is the purpose of Core Graphics shadowing and how do you apply shadows to views or shapes?
4. Explain the concept of view controller containment and how it is used in iOS app architecture.
5. How do you implement gesture recognizers in iOS, and what are some common gestures you can recognize?
6. What is the purpose of Core Graphics PDF generation, and how do you generate PDFs programmatically?
7. Explain the concept of function currying in Swift and provide an example of its usage.
8. How do you handle background downloads or uploads in an iOS app using URLSession?
9. What are the different types of concurrency models available in iOS, and when would you use each one?
10. How do you implement a custom collection view layout in iOS, with custom item sizes and arrangements?
11. Explain the concept of Core Graphics masking and how it is used to reveal or hide portions of an image or view.
12. What is the purpose of Core Data NSFetchedResultsController, and how do you use it to fetch and display data?
13. How do you implement a custom interactive transition between view controllers using UIPercentDrivenInteractiveTransition?
14. Explain the concept of Core Graphics blend modes and how they affect the blending of colors and shapes.
15. What are the different types of notifications available in iOS, and how do you handle them using NotificationCenter?
16. How do you handle user location updates in an iOS app using Core Location, and what are some best practices?
17. What is the purpose of Core Graphics pattern and how do you create custom pattern fills for shapes or views?
18. Explain the concept of Core Data NSManagedObjectModel and NSPersistentStoreCoordinator, and their roles in data persistence.
19. How do you implement an image picker controller in iOS, allowing users to select photos or videos from their device?
20. What are the differences between a frame and a bounds of a view, and when would you use each one?
21. Explain the concept of Core Animation CAEmitterLayer, and how you can create particle-based animations.
22. How do you implement dynamic typography in iOS, adapting the font size based on user accessibility preferences?
23. What is the purpose of Core Graphics gradients, and how do you create linear or radial gradients in iOS?
24. Explain the concept of Core Animation implicit and explicit animations, and how they differ in their usage.
25. How do you implement in-app purchases in an iOS app, allowing users to unlock premium content or features?
26. What is the purpose of Core Graphics bitmap context, and how do you perform custom image or graphics rendering?
27. How do you handle keyboard input and manage the keyboard appearance in an iOS app?
28. Explain the concept of Core Graphics data types, such as CGPoint, CGSize, and CGRect, and how they are used for coordinate and size calculations.
29. What is the purpose of Core Data NSManagedObject, and how do you perform CRUD operations on managed objects?
30. How do you implement a custom interactive animation using UIViewPropertyAnimator or UIView.animateKeyframes?
31. Explain the concept of Core Graphics transformation matrices, and how you can apply scaling, rotation, and translation to views or shapes.
32. What are the different types of gestures available in iOS, and how do you handle multi-touch gestures?
33. How do you implement data synchronization between devices using CloudKit or other cloud-based services?
34. What is the purpose of Core Graphics text rendering, and how do you draw formatted text with custom attributes?
35. Explain the concept of Core Animation CAKeyframeAnimation, and how you can create complex animations with keyframes.
36. How do you implement biometric authentication (such as Face ID or Touch ID) in an iOS app?
37. What is the purpose of Core Graphics context stack, and how do you manage the state of the graphics context?
38. Explain the concept of Core Animation timing functions, and how you can customize the pacing of animations.
39. How do you implement a custom push/pop transition between navigation controller view controllers?
40. What are the different types of storage options available in iOS, and when would you use each one?
41. Explain the concept of Core Graphics image interpolation, and how you can control the quality of image scaling.
42. How do you implement text-to-speech functionality in an iOS app using AVSpeechSynthesizer?
43. What is the purpose of Core Graphics clipping paths, and how do you create non-rectangular shapes or masks?
44. Explain the concept of Core Data managed object contexts, and how you use them to manage object lifecycle.
45. How do you implement dynamic theming in an iOS app, allowing users to switch between light and dark modes?
46. What is the purpose of Core Graphics blend modes, and how do you use them to create visual effects?
47. How do you implement custom push notifications in an iOS app, allowing for personalized and interactive notifications?
48. Explain the concept of Core Graphics coordinate systems, and how you can convert between different coordinate spaces.
49. What is the purpose of Core Animation CAReplicatorLayer, and how can you use it to create repeating patterns or effects?
50. How do you implement a custom presentation controller for modal or popover-style presentations in iOS?