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Which of the following methods is called when a view is about to appear on the screen?

  • viewDidLoad
  • viewWillAppear
  • viewDidAppear
  • viewWillDisappear
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How do you create a computed property in Swift?

  • var computedProperty: Int { return 1 }
  • let computedProperty: Int { return 1 }
  • computed computedProperty: Int { return 1 }
  • def computedProperty: Int { return 1 }
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What is used to handle background tasks in iOS?

  • NSBackground
  • BGTask
  • BackgroundWorker
  • URLSession
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What is the primary design pattern used in iOS development?

  • Singleton
  • Observer
  • MVC
  • MVVM
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What is the file extension for a Swift source file?

  • .java
  • .kt
  • .swift
  • .py
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Which tool is used for debugging and analyzing performance in Xcode?

  • Android Monitor
  • Instruments
  • Debug Console
  • Logcat
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Which of the following is used to build user interfaces in iOS applications?

  • XML
  • HTML
  • Interface Builder
  • SwiftUI
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What is the purpose of the ?guard? statement in Swift?

  • Declare a variable
  • Ensure a condition is true
  • Handle errors
  • Create a loop
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Which type is used to represent text in Swift?

  • String
  • str
  • text
  • Txt
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Which tool can be used for managing multiple Xcode versions?

  • xcode-select
  • xcode-manager
  • xcode-switcher
  • xcode-choose
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Which framework is primarily used for handling data persistence in iOS apps?

  • Core Data
  • Room
  • SQLite
  • Core Storage
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Which method is called when an app receives a memory warning?

  • didReceiveMemoryWarning
  • memoryWarningReceived
  • handleMemoryWarning
  • onMemoryWarning
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What is the purpose of the ?lazy? keyword in Swift?

  • Declare a variable that is computed only once
  • Declare a variable that can be nil
  • Declare a variable that is mutable
  • Declare a variable that is immutable
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What does the '?' operator signify in Swift?

  • Optional
  • Constant
  • Variable
  • Closure
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How do you define a function in Swift?

  • def myFunction() {}
  • func myFunction() {}
  • function myFunction() {}
  • function() myFunction {}
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What is a closure in Swift?

  • A type of array
  • A reference to a function
  • An anonymous function
  • A type of constant
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What is the root class of most UIKit classes?

  • UIView
  • UIResponder
  • NSView
  • UIObject
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Which protocol is used for table view data sources?

  • UITableViewDataSource
  • UITableViewDelegate
  • UITableViewSource
  • UITableViewHandler
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What method is used to remove an observer in NotificationCenter?

  • removeObserver
  • deleteObserver
  • unregisterObserver
  • clearObserver
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Which class represents the app?s main event loop and high-level app behaviors?

  • UIApplication
  • UIAppController
  • AppDelegate
  • AppController
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Which method is used to add a subview to a view in UIKit?

  • addSubView
  • appendView
  • insertSubView
  • addSubview
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How do you handle errors in Swift?

  • try-catch
  • catch-try
  • do-try-catch
  • do-catch
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How do you handle asynchronous code in Swift?

  • async-await
  • promise-then
  • dispatch-async
  • queue-async
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What is the entry point of an iOS application?

  • Main.storyboard
  • AppDelegate
  • ViewController
  • SceneDelegate
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Which of these is a valid way to unwrap an optional in Swift?

  • if let
  • try catch
  • unwrap
  • guard let
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Which keyword is used to define an enumeration in Swift?

  • class
  • struct
  • enum
  • type
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Which method is used to animate views in UIKit?

  • animate
  • performAnimation
  • UIView.animate
  • UIView.performAnimation
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