iOS Application Logic and Functionality: Master App Development

Question 1

In iOS application development, what is the fundamental difference between Core Data and SQLite for data storage?

Accepted Answer

Core Data uses an object-oriented data model, while SQLite employs a relational data model.

Answer

Core Data is better suited for handling small datasets, while SQLite is more appropriate for managing large datasets.

Answer

Core Data is only available for iOS platforms, while SQLite can be used on various platforms.

Question 2

Which of the following is NOT a fundamental aspect of iOS application logic and functionality?

Accepted Answer

User interface design

Answer

Event handling

Answer

Data storage

Answer

Networking

Question 3

What is the primary Swift data structure used to store ordered collections of values?

Accepted Answer

Array

Answer

Dictionary

Answer

Set

Answer

Queue

Question 4

Which method in Swift is used to respond to touch events when a finger is lifted from the screen?

Accepted Answer

touchUp

Answer

touchDown

Answer

touchMoved

Answer

touchCancelled

Question 5

What is the primary responsibility of the 'AppDelegate' class in iOS development?

Accepted Answer

Managing the application's lifecycle

Answer

Handling user input

Answer

Performing networking operations

Answer

Storing application data

Question 6

Which networking framework is typically used for asynchronous data transfer in iOS applications?

Accepted Answer

URLSession

Answer

NSURLRequest

Answer

NSURLConnection

Answer

AFNetworking

Question 7

What is the purpose of the '@State' property wrapper in SwiftUI?

Accepted Answer

To store data that can be modified by the view and triggers a UI update

Answer

To define custom view layouts

Answer

To handle user input

Answer

To perform networking operations

Question 8

What is the primary purpose of the 'IBAction' and 'IBOutlet' keywords in iOS development?

Accepted Answer

To connect UI elements to code and handle user actions

Answer

To define custom view controllers

Answer

To store application data

Answer

To perform networking operations

Question 9

What is the primary purpose of using Core Data in iOS applications?

Accepted Answer

To persist and structure data locally

Answer

To handle networking operations

Answer

To manage the user interface

Answer

To optimize app performance

Question 10

What is the purpose of delegates in iOS development?

Accepted Answer

To facilitate communication between objects

Answer

To manage the user interface

Answer

To store application data

Answer

To handle networking requests

Question 11

How do storyboards differ from xib files in iOS?

Accepted Answer

Storyboards design complete user interfaces, while xib files focus on individual views

Answer

Xib files design complete user interfaces, while storyboards focus on individual views

Answer

Storyboards and xib files are interchangeable and serve the same purpose

Answer

Xib files are used in older iOS versions, while storyboards are used in newer versions

Question 12

Which framework is responsible for state management in iOS applications?

Accepted Answer

Combine

Answer

UIKit

Answer

Core Data

Answer

SceneKit

Question 13

What is the main advantage of using auto layout in iOS?

Accepted Answer

Ensuring that user interface elements adapt to various screen sizes

Answer

Handling user input and gestures

Answer

Optimizing app performance

Answer

Storing application data

Question 14

Which class serves as the foundation for creating custom views in iOS?

Accepted Answer

UIView

Answer

UIViewController

Answer

UINavigationController

Answer

UITableViewController

Question 15

What is the primary benefit of using a singleton class in iOS development?

Accepted Answer

Ensuring that only one instance of a class exists

Answer

Facilitating data storage

Answer

Managing networking operations

Answer

Optimizing app performance

Question 16

In Objective-C, what is the primary purpose of the `override` keyword?

Accepted Answer

To override a method inherited from a superclass.

Answer

To define a new method in a subclass.

Answer

To call a method defined in a different class.

Answer

To declare a constant.

Question 17

In iOS development, what is the primary purpose of a storyboard?

Accepted Answer

To design and manage the user interface of an application.

Answer

To handle and respond to user interactions.

Answer

To store and manage application data.

Answer

To perform networking operations.

Question 18

In iOS development, what is the primary purpose of a Singleton class?

Accepted Answer

To ensure that only a single instance of a class exists throughout the application.

Answer

To handle and manage user interactions.

Answer

To store and manage application data.

Answer

To perform networking operations.

Question 19

Which of the following is NOT a valid event handling method in iOS application development using Swift?

Accepted Answer

func viewDidLoad()

Answer

func buttonTapped(sender: UIButton)

Answer

func tableView(_: didSelectRowAt:)

Answer

func prepare(for segue: UIStoryboardSegue, sender: Any?)

Question 20

What is the primary data persistence mechanism used in iOS applications?

Accepted Answer

Core Data

Answer

UserDefaults

Answer

SQLite

Answer

Firebase

Question 21

What is the purpose of the `self` keyword in Swift?

Accepted Answer

To reference the current instance of the class

Answer

To pass the current instance as an argument to a method

Answer

To access static properties and methods of the class

Answer

To create a new instance of the class

Question 22

Which of the following view controllers is used to display a table view?

Accepted Answer

UITableViewController

Answer

UIViewController

Answer

UINavigationController

Answer

UITabBarController

Question 23

What is the purpose of the `viewDidLoad()` lifecycle method in iOS application development?

Accepted Answer

Called once when the view controller's view is loaded into memory

Answer

Called every time the view controller's view appears on screen

Answer

Called every time the view controller's view is dismissed from screen

Answer

Called when the view controller's view is unloaded from memory

Question 24

What is the purpose of the `override` keyword in Swift?

Accepted Answer

To override a method or property from a superclass

Answer

To create a new method or property

Answer

To prevent a method or property from being inherited

Answer

To make a method or property public

Question 25

What is the primary method of handling user input in an iOS application?

Accepted Answer

Target-Action pattern

Answer

Delegate pattern

Answer

NotificationCenter pattern

Answer

Timer pattern

Question 26

Which type of storage is most suited for storing user preferences in an iOS application?

Accepted Answer

UserDefaults

Answer

Core Data

Answer

Property List

Answer

SQLite

Question 27

What is the intended purpose of the `URLSession` class in iOS networking?

Accepted Answer

To make asynchronous network requests

Answer

To parse JSON responses

Answer

To cache network responses

Answer

To secure network connections

Question 28

What is the Swift keyword used to declare a function that executes code concurrently?

Accepted Answer

async

Answer

concurrent

Answer

parallel

Answer

atomic

Question 29

What is the purpose of the `NotificationCenter` class in iOS?

Accepted Answer

To send and receive notifications within the app

Answer

To handle user interface events

Answer

To manage network requests

Answer

To store user preferences

Question 30

What is the purpose of the `@IBOutlet` attribute in Swift?

Accepted Answer

It connects a UI element to a property in your code

Answer

It defines a custom method for event handling

Answer

It specifies the data type of a property

Answer

It marks a property as read-only

Question 31

Which networking framework is used for asynchronous data transfer in iOS?

Accepted Answer

URLSession

Answer

NSURLConnection

Answer

Alamofire

Question 32

What is the main purpose of the AppDelegate class in an iOS application?

Accepted Answer

Manage application state and lifecycle

Answer

Provide access to system resources

Answer

Handle user interface events

Question 33

Which of the following is NOT a component of the Model-View-Controller (MVC) design pattern?

Accepted Answer

Presenter

Answer

Model

Answer

View

Question 34

What is the primary purpose of a storyboard in iOS application development?

Accepted Answer

To create and manage user interface screens

Answer

To handle application logic

Answer

To store user data

Question 35

Which data type is used to store an ordered collection of elements?

Accepted Answer

Array

Answer

Dictionary

Answer

Set

Answer

Tuple

Question 36

What is the primary purpose of the 'UserDefaults' class?

Accepted Answer

To store user preferences and settings

Answer

To handle network requests

Answer

To display UI elements

Answer

To manage app lifecycle

Question 37

Which networking framework is primarily used in iOS applications for sending and receiving data?

Accepted Answer

URLSession

Answer

UIKit

Answer

CoreData

Answer

SystemConfiguration

Question 38

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

Accepted Answer

Classes are reference types, while structs are value types.

Answer

Structs can inherit from classes, but classes cannot inherit from structs.

Answer

Structs are always immutable, while classes can be both mutable and immutable.

Answer

Classes can define custom initializers, while structs cannot.

Question 39

What is the purpose of the `viewDidLoad()` method in a UIViewController?

Accepted Answer

To initialize the view controller's user interface

Answer

To handle user interactions

Answer

To fetch data from the network

Answer

To store user settings

Question 40

Which method is used to present a modal view controller?

Accepted Answer

present(animated:completion:)

Answer

show(animated:completion:)

Answer

push(animated:)

Answer

replace(animated:)

Question 41

What is the purpose of the '@IBOutlet' attribute?

Accepted Answer

To connect UI elements in Interface Builder to code in your project

Answer

To define custom properties

Answer

To handle user events

Answer

To store data

Question 42

Which technology is used to implement declarative UI in iOS applications?

Accepted Answer

SwiftUI

Answer

XML

Answer

JSON

Answer

CoreData

Question 43

In iOS, how do the `UITableViewDataSource` and `UITableViewDelegate` protocols collaborate to manage data in table views?

Accepted Answer

Data source provides data, delegate handles events.

Answer

Delegate sets data source, data source handles events.

Answer

Both protocols handle events, no data source needed.

Answer

Delegate provides data, data source handles events.

Question 44

Which AppDelegate method is called **immediately** after the application is launched and enters the foreground?

Accepted Answer

application(_:didFinishLaunchingWithOptions:)

Answer

applicationWillTerminate(_:)

Answer

applicationWillEnterForeground(_:)

Answer

applicationDidBecomeActive(_:)

Question 45

In a view controller, where should you handle user interactions such as button taps?

Accepted Answer

View controller's target-action method

Answer

AppDelegate

Answer

Storyboard

Answer

Model

Question 46

Which Swift data type is most suitable for storing a collection of unique and unordered elements, without duplicate entries?

Accepted Answer

Set

Answer

Dictionary

Answer

Tuple

Answer

Array

Question 47

In Swift, what is the primary purpose of the `@IBAction` attribute?

Accepted Answer

Connects a user interface control to a specific method in the code

Answer

Defines a view controller

Answer

Stores data in a model

Answer

Handles network requests

Question 48

Which method of the URLSession class is used to make a network request and retrieve data?

Accepted Answer

dataTask(with:completionHandler:)

Answer

request(_:completionHandler:)

Answer

downloadTask(with:completionHandler:)

Answer

uploadTask(with:from:completionHandler:)

Question 49

What is the main responsibility of a delegate in iOS development?

Accepted Answer

Facilitates communication and data exchange between different objects or components in the application

Answer

Handles user input directly

Answer

Stores data in a database

Question 50

Which fundamental difference distinguishes a struct from a class in Swift?

Accepted Answer

Structs are value types, while classes are reference types

Answer

Classes can be mutated, while structs cannot

Answer

Structs can inherit from other types, while classes cannot

Question 51

What is the primary purpose of using the `override` keyword in Swift?

Accepted Answer

Indicates that a method in a subclass overrides a method with the same name and signature in its superclass

Answer

Prevents a method from being overridden in subclasses

Answer

Marks a method as abstract

Question 52

When is the `viewDidLoad()` method called in a view controller?

Accepted Answer

After the view controller's view has been loaded into memory

Answer

When the view controller is initialized

Answer

When the user interacts with the view controller's view