26. The Android equivalent of SwiftUI is:
- Fragments
- Jetpack Compose
- XML Views
- Gradle
Answer: B) Jetpack Compose
Explanation: Both are modern declarative UI toolkits.
MCQs / Computer Science / iOS: Architecture and Framework
iOS: Architecture and Framework MCQs — Computer Science (page 2)
47 multiple-choice questions on iOS: Architecture and Framework from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
27. The Security framework and keychain are part of the:
- Core OS layer
- Cocoa Touch layer
- App layer
- Media layer
Answer: A) Core OS layer
Explanation: Low-level security services are in Core OS.
28. Interface Builder files used to visually design several UIKit screens and their transitions are called:
- Bundles
- Storyboards
- Manifests
- Plists
Answer: B) Storyboards
Explanation: Storyboards contain scenes and segues for UIKit apps.
29. Apple recommends that developers use:
- The highest-level framework that meets their needs
- Only the Core OS layer
- Only Objective-C
- Assembly language
Answer: A) The highest-level framework that meets their needs
Explanation: Higher layers are easier, safer and more efficient for most tasks.
30. An iOS app in the foreground but not receiving events (e.g. during an incoming call alert) is:
- Suspended
- Active
- Inactive
- Not running
Answer: C) Inactive
Explanation: Inactive means foreground without receiving events.
31. In UIKit, an @IBOutlet is used to:
- Import a library
- Handle a button tap
- Declare a database table
- Reference a storyboard UI element from code
Answer: D) Reference a storyboard UI element from code
Explanation: Outlets connect UI elements to properties in code; actions connect events to methods.
32. Which UIKit class shows a scrolling list of rows?
- UIStepper
- UISwitch
- UITableView
- UILabel
Answer: C) UITableView
Explanation: UITableView displays rows in a single column list.
33. SwiftUI is described as a:
- Declarative UI framework
- Imperative networking library
- Database framework
- Kernel extension
Answer: A) Declarative UI framework
Explanation: In SwiftUI you declare the UI for a given state.
34. The Apple Developer Program fee for publishing apps is:
- Free forever
- USD 25 one time
- USD 10 per app
- USD 99 per year
Answer: D) USD 99 per year
Explanation: Apple charges USD 99 per year.
35. Which is the HIGHEST layer of the iOS architecture?
- Core Services
- Media
- Core OS
- Cocoa Touch
Answer: D) Cocoa Touch
Explanation: Cocoa Touch is the top layer that apps interact with most.
36. In SwiftUI, which container arranges views vertically?
- List only
- HStack
- VStack
- ZStack
Answer: C) VStack
Explanation: VStack stacks child views vertically.
37. The iOS kernel is called:
- Windows NT
- XNU (part of Darwin)
- Linux
- Mach-Linux
Answer: B) XNU (part of Darwin)
Explanation: XNU, a hybrid of Mach and BSD, is the kernel of Darwin used by iOS and macOS.
38. Which SwiftUI property wrapper stores local mutable state of a view?
- @State
- @IBOutlet
- @main
- @objc
Answer: A) @State
Explanation: @State holds view-local state; changing it re-renders the view.
39. Apple's OS for the Vision Pro headset is:
- XROS-Android
- visionOS
- watchOS
- tvOS
Answer: B) visionOS
Explanation: visionOS runs on Apple Vision Pro.
40. Xcode runs on:
- macOS only
- Android
- Windows
- Linux
Answer: A) macOS only
Explanation: Xcode is available only for macOS.
41. Which UIViewController method is called once after the view is loaded into memory?
- viewDidLoad()
- viewWillAppear()
- viewDidDisappear()
- deinit
Answer: A) viewDidLoad()
Explanation: viewDidLoad is the usual place to set up the UI, like Android's onCreate.
42. How many main layers are in the classic iOS architecture?
- Two
- Four
- Five
- Three
Answer: B) Four
Explanation: Core OS, Core Services, Media and Cocoa Touch.
43. The iOS app package uploaded to the store is a/an:
- IPA
- DEX
- AAB
- APK
Answer: A) IPA
Explanation: iOS apps are packaged as IPA files.
44. Which Xcode tool profiles memory, CPU and energy usage?
- Simulator
- Instruments
- Interface Builder
- TestFlight
Answer: B) Instruments
Explanation: Instruments is Xcode's performance profiling tool.
45. Which iOS framework is used to show maps inside an app?
- MapKit
- Core Image
- Accelerate
- PhotoKit
Answer: A) MapKit
Explanation: MapKit embeds maps and annotations.
46. In UIKit, each screen is usually managed by a:
- UIWindowDelegate
- NSManagedObject
- UIViewController
- UIApplication
Answer: C) UIViewController
Explanation: A view controller manages one screen's views and events.
47. Swift Package Manager and CocoaPods are used to:
- Add third-party libraries (dependencies)
- Encrypt the IPA
- Design icons
- Test on Android
Answer: A) Add third-party libraries (dependencies)
Explanation: They are dependency managers for iOS projects.
Previous Page 2 of 2
Practise iOS: Architecture and Framework MCQs
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