iOS
Interview
Handbook
A comprehensive guide to cracking your iOS
interview with top interview questions,
roadmap for mastering interview preparation.
Curated By
Swiftable
Table of Contents
Introduction
Chapter 01: Swift Fundamentals Roadmap
Chapter 02: UIKit Fundamentals Roadmap
Chapter 03: Intermediate Roadmap
Chapter 04: Product-Based Roadmap
Chapter 05: Experience Level
Chapter 06: Class, Structure, Actors & Enumeration
Chapter 07: Properties & Initializers
Chapter 08: Functions, Methods & Closures
Chapter 09: Protocol & Delegation
Chapter 10: SOLID Principles
Chapter 11: Generics & Error Handling
Chapter 12: Memory Management
Chapter 13: Combine Framework
Chapter 14: App Security
Chapter 15: Networking
Chapter 16: UIViewController Life-Cycle
Chapter 17: App Performance
Chapter 18: Concurrency
Chapter 19: UIKit Framework
Chapter 20: SwiftUI Framework
Chapter 21: Miscellaneous
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Introduction
iOS Interview Handbook (Your key to unlocking a new career)
In today's competitive job market, having access to quality questions and a
well-defined roadmap can give you a significant advantage over your peers.
It equips you with the tools and knowledge needed to stand out during the
interview process, increasing your chances of securing a good job.
Interview Questions: Dive into an extensive collection of 270+ curated iOS
interview questions, meticulously selected to cover important topics and
difficulty levels.
Preparation Roadmap: Navigate your journey to interview success with our
comprehensive roadmap, meticulously crafted to provide you with a clear
and structured path for interview preparation.
Personalized Session: Gain the exclusive opportunity to discuss your
doubts in a personalized one-to-one session, where you'll receive tailored
guidance, feedback, and strategies from an experienced iOS expert.
In future updates, the goal is to transform this book into the ultimate guide for
iOS developers of all levels, from junior to senior. It will offer comprehensive
guidance tailored specifically for interview preparation.
If you have any doubts or queries, please don't hesitate to reach out to us via
email: devswiftable@gmail.com
Copyright @Swiftable 2024, All Rights Reserved
Chapter 01: Swift Fundamentals Roadmap
All Level
It's essential to practice writing Swift code and understand language-specific
concepts. There are some important topics you should definitely prepare:
Classes, structures, actors, and enums
Properties, methods, and initializers
Inheritance, encapsulation, and polymorphism
Creating generic functions, types, and protocols
Understanding associated types and type constraints
Using generics for code reuse and flexibility
Property observers and computed properties
Extensions and protocol extensions
Type aliases and associated values
Understanding closures as self-contained blocks of functionality
Syntax and capturing values
Using closures as arguments and return types in functions
Working with escaping and non-escaping closures
Understanding the differences between closures, functions, and methods
Understanding access levels: public, internal, fileprivate, and private
Applying access controls to classes, properties, methods, and initializers
Understanding the scope and visibility of different access levels
Note:
Required 1 hour per day to prepare Swift (in depth) for interview
Learn Swift for 1 hour daily for 45 days at least
Keep more focus on week topics and new features released in Swift
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Chapter 02: UIKit Fundamentals Roadmap
All Level
Having a solid understanding of UIKit, one of the core frameworks in iOS
development, is crucial. Here are some important topics to focus on from
UIKit fundamentals:
Understanding the view hierarchy and the role of UIWindow
Life cycle of AppDelegate and ViewController
Adapting user interfaces for different screen sizes and orientations
Implementing custom views and reusable UI controls
Localizing app content for different languages and regions
UITableView/UICollectionView for pagination with good performance and
optimisation
Build user interfaces via programmatically and interface builder
Good understanding of working with navigation controller and its
customization
Implementing different ways to communicate between view controllers
Learn about NSAttributedString for advanced text formatting and styling
Explore UIFont for customizing fonts and font attributes
Best practices for organizing and structuring code to improve maintainability
and readability
How to efficiently populate and customize cells, headers, and footers
Note:
Required 1.5-2 hours per day to prepare for interview.
Remember that, still UIKit is required for cracking the interview.
Make small project every week with different functionality in UIKit.
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Chapter 03: Intermediate Roadmap
Mid & Senior Level
Advanced Swift Language Features:
In-built higher-order functions and how to make custom?
Deep knowledge of memory management, including weak and unowned
references, reference cycles, and manual memory management
techniques.
Architectural Patterns and Design Principles:
In-depth understanding of architectural patterns like MVVM, VIPER, and
Clean Architecture.
Knowledge of design principles and best practices for building scalable,
modular, and maintainable iOS applications.
Experience in designing and implementing complex app architectures,
including separation of concerns, dependency injection, and unit testing.
Good understanding of SOLID Principles and why they are important to
code readability.
Concurrency and Performance Optimization:
Proficiency in multithreading and concurrency concepts, including GCD,
operation queues, and background processing.
Adopting and implementation of modern concurrency in the app.
Familiarity with performance optimization techniques, such as efficient
memory management, lazy loading, and asynchronous programming.
Understanding of profiling and debugging tools to identify and resolve
performance bottlenecks.
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Chapter 03: Intermediate Roadmap
Mid & Senior Level
Core Data and Persistence:
In-depth knowledge of CoreData framework, including data modeling,
relationships, fetch requests, and data migration.
Experience with alternative persistence solutions like Realm,
UserDefaults, Keychain, or Firebase Firestore.
Explore fundamental concepts of SwiftData.
Networking and API Integration:
Expertise in working with RESTful APIs, including authentication,
handling JSON responses, and error handling.
Experience with networking libraries like Alamofire or URLSession, and
familiarity with authentication mechanisms like OAuth or JWT.
Knowledge of advanced networking concepts, such as background
downloads/uploads, caching strategies, and request/response
validation, semaphore.
Testing and Continuous Integration:
Experience with unit testing, integration testing, and UI testing
frameworks like XCTest.
Familiarity with test-driven development (TDD) and behavior-driven
development (BDD) methodologies.
Understanding of continuous integration and deployment practices,
including tools like Jenkins, Fastlane, etc.
Understanding of how protocol oriented programming (POP) helps to
testing.
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Chapter 03: Intermediate Roadmap
Mid & Senior Level
App Security and Data Privacy:
Understanding of secure coding practices and common vulnerabilities in
iOS apps (e.g., input validation, secure data storage, encryption).
Knowledge of user privacy regulations and best practices for handling
sensitive user data (e.g., GDPR).
Leadership and Team Collaboration:
Experience leading iOS development teams, mentoring junior
developers, and driving technical decisions.
Ability to communicate effectively with cross-functional teams, product
managers, and stakeholders.
Strong problem-solving and critical-thinking skills, as well as the ability to
adapt to new technologies and frameworks.
Copyright @Swiftable 2024, All Rights Reserved
Chapter 04: Product-Based Roadmap
All Level
To crack iOS interviews at product-based companies, in addition to technical
knowledge, there are a few key areas you should focus on:
Research the product-based company thoroughly, including its products,
target audience, and industry.
Be prepared to discuss how your skills and experience align with the
company's products and goals.
Familiarize yourself with the product development lifecycle, including
requirements gathering, design, development, testing, and deployment.
Demonstrate an understanding of user-centered design principles and
the importance of a seamless user experience.
Showcase your ability to work collaboratively with designers and UX/UI
teams to deliver exceptional user experiences.
Highlight your expertise in integrating with external APIs and third-party
services to enhance app functionality.
Showcase any relevant experience in data synchronization, offline
capabilities, or real-time updates.
Demonstrate your understanding of designing and developing scalable
iOS applications that can handle large user bases and increasing data
loads.
Showcase your ability to think critically and approach problems from a
product perspective.
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Chapter 05: Experience Level
Include additional topics in the preparation roadmap according to your
experience level:
Junior Level:
Swift, UIKit and SwiftUI Fundamentals
Problem Solving: Basic array operations and string manipulation
Basic Data Structures: Searching, sorting, stack, queue and linked lists
Intermediate Level:
Junior level +
Problem Solving: Practice easy and medium level problems to solve
(refer LeetCode or HackerRank).
Fundamentals of Mobile System Design
Understanding of AppStore guidelines
Familiarize yourself with CI/CD tools
Learn how to write unit tests
Senior Level:
(Junior + Intermediate) +
Strong understanding on Data Structure and Algorithms
Good understanding on Mobile System Design
Learn techniques for optimizing app performance
Deep understanding of concurrency (Traditional + Modern)
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Chapter 06: Class, Struct, Actors & Enums
What are the differences between class and struct?
When would you use class over struct?
What do you understand by value types and reference types? Explain the
difference in terms of passing them further.
Does struct support inheritance? If not, explain why?
What are the actors and how do they help write concurrent code?
How are actors different from classes and structures?
How actors help in preventing data races and ensuring thread safety?
How does memory management work for classes and structs? How can you
optimize memory while using them?
How does ARC affect memory management for class instances?
How does method dispatch differ between classes and structures?
Differentiate between a raw value and an associated value in an enum?
How can you create a custom initializer with associated values in enums?
How is this feature beneficial?
How can you iterate through all cases in enums?
What is recursive enumeration? Explain with a practical use case.
What are the benefits of using enums in your code?
Explain the role of indirect keyword in enums and where they are stored?
Explain the concept of copy-on-write (COW) in respect of structures and
classes. Where COW might introduce performance overhead?
Explain the differences between deep copying and shallow copying, and how
they apply to classes, structs, and enums.
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Chapter 07: Properties & Initializers
What are Type properties? How does Swift manage the memory lifecycle of
Type properties?
What are the differences between stored and computed properties?
What is lazy initialization and discuss the pros and cons of using it?
What are property observers and when can they be useful?
Why is it required to declare a lazy property as a variable?
What is the difference between lazy and computed properties?
Is there any difference between computed properties and functions?
What is a property wrapper? Explain with an example when they are useful.
Why does Swift not provide a member-wise initializer for classes?
What are the designated initializers? Can a class or struct have multiple
designated initializers?
What are convenience initializers?
Explain the concept of initializer delegation. What are the rules Swift applies
for delegation calls between initializers?
What is Two-Phase Initialization? What are the two phases of Two-Phase
Initialization?
What is a failable initializer? When should you use a failable initializer
What is a required initializer? Why would you use a required initializer in a
class?
What happens if a subclass doesn’t provide an implementation of a required
initializer?
How do you add computed properties using extensions? Can you give an
example?
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Chapter 08: Functions, Methods & Closures
Explain with an example how the map function works?
Discuss the performance impacts of using higher-order functions compared
to traditional loop-based approaches.
Write a custom higher order function wrt. a function that takes a closure and
an array of integers and returns the sum of squares of those integers.
What is the difference between escaping and non-escaping closures?
Why do you need escaping closures? Explain with an example.
How can you prevent retain cycles when using escaping closures?
What is a capture list and when would you use it?
What is trailing closure syntax? How does it enhance code readability?
Discuss the concept of capturing self in closure. How can it lead to retain
cycles, and how do you prevent them?
Discuss the performance implications of using closures. When should you be
cautious about closure usage?
How can you create a custom higher-order function to apply multiple
conditions?
Why the == operator is overridden as a static method with Equatable
protocol?
What are autoclosures and how do they differ from regular closures?
Explain the comparison between anonymous functions and named closures.
How would you handle a case where you need to capture an immutable state
in a closure to ensure thread safety?
Explain the difference between weak and unowned references in terms of
capturing self.
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Chapter 09: Protocol & Delegation
How do you provide default implementations for protocol methods using
protocol extensions?
What is a protocol composition? Can you explain how it's related to protocol
extensions?
How does method dispatch work with protocol extensions? Compare it with
class inheritance.
Can you explain the difference between type aliases and associated types in
protocols?
Discuss the differences between using protocols and closures for
communication between objects. When would you choose one over the
other?
What is the @objc attribute, and why might you need to use it when working
with protocols?
What are the advantages of using protocols for delegation instead of
inheritance?
How does protocol inheritance enable code reuse and maintainability?
What are the benefits of using protocol composition over protocol
inheritance?
Discuss the difference between class inheritance and protocol inheritance.
What is a protocol extension with a default implementation? How does it
facilitate backward compatibility and code maintenance?
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Chapter 10: SOLID Principles
Can you explain what the SOLID principles are and why they are important in
iOS development?
How would you refactor a legacy iOS codebase that doesn't adhere to
SOLID principles?
How do you identify if a class violates the Single Responsibility Principle?
Can you provide an example of refactoring code to adhere to SRP?
How can you design iOS classes/modules to be open for extension but
closed for modification?
How do you ensure that subclasses can be substituted for their base classes
without affecting the behavior of the code?
How can you design protocols/interfaces to adhere to ISP?
Explain the Dependency Inversion Principle and its role in writing
maintainable and scalable iOS apps.
How would you convince your team to adopt SOLID principles to embrace
them in the project workflow?
What is the difference between dependency inversion and dependency
injection?
How do SOLID principles contribute to code reusability and modularity?
What are your thoughts on the potential drawbacks or limitations of strictly
adhering to SOLID principles?
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Chapter 11: Generics & Error Handling
Explain the concept of type constraints in generics.
What is type erasure? How can it be useful when working with protocols and
generics?
Discuss the benefits of using generics.
What are associated types in generics? Provide a practical use case where
associated types are beneficial.
Can you explain the difference between using generics and protocols with
associated types?
Explain the concept of "where" clauses in generic functions and types.
Discuss the performance implications of using generics. Are there any best
practices to optimize the performance of code involving generics?
Can you explain how generics are used in the Swift standard library? Provide
examples of standard library types and functions that make use of generics.
Provide an example where you utilize function overloading with generics.
Differentiate between try, try?, and try!.
How would you create a custom error type? Provide an example.
Explain the difference between a fatalError and throwing an error.
Explain how you would handle asynchronous errors in, such as those
occurring in asynchronous operations or networking tasks.
Explain how you would localize error messages for different languages.
In what scenarios would you use defer in error handling code?
Explain the throws, do, try, and catch keywords.
Explain the difference between throw and rethrow keywords?
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Chapter 12: Memory Management
What is a retain cycle, and how does it occur in iOS apps? Can you provide
an example?
How strong references in a closure capturing scenario can lead to memory
leaks?
Discuss the importance of using weak or unowned references when dealing
with delegate protocols.
What are the best practices for managing memory in iOS applications?
How do you debug memory-related issues in your code, such as retain
cycles or unexpected memory usage?
What do you understand by thread safety? Explain with an example.
How Automatic Reference Counting (ARC) manages memory for objects?
What is the importance of the deinit method in classes, and when would you
typically implement it?
Explain the differences between stack and heap memory allocation and how
they work?
Explain how you would optimize memory usage and improve performance in
iOS apps that heavily rely on multimedia content.
What are the impacts that may occur of using third-party libraries and
frameworks in terms of memory management?
What are the things you should consider to prevent memory leaks and
improve performance in singleton implementations?
How would you optimize memory usage when working with large amounts of
datasets?
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Chapter 13: Combine Framework
What are publishers and subscribers in Combine? How do they interact?
Can you explain the concept of operators in Combine? Give examples of
commonly used operators and their purposes.
What is backpressure in Combine, and how can you handle it?
What are subjects in Combine? When would you use them in your code?
What is the difference between Combine and RxSwift or ReactiveSwift?
Describe how error handling is done in Combine. How do you handle errors
gracefully in a Combine pipeline?
How would you integrate Combine with SwiftUI to build reactive user
interfaces?
What is the purpose of the sink method in Combine, and when would you use
it?
Can you describe the role of the AnyCancellable type in Combine?
How would you handle resource cleanup and cancellation in a Combine
subscription?
What is the purpose of the assign operator in Combine, and when would you
use it?
What are some common scenarios where you would use Combine in an iOS
app?
How would you implement debouncing or throttling in a Combine pipeline?
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@Swiftable
Chapter 14: App Security
Discuss the use of Keychain Services for secure data storage.
Explain the concept of HTTPS and its significance in mobile security.
How do you handle sensitive user information such as passwords or
personal data securely in an iOS app?
Discuss the best practices for securely storing and managing API keys and
other secrets.
Explain the role of App Transport Security (ATS) in iOS app security.
How do you handle security updates and patches in a deployment?
How do you handle common network security threats such as man-in-themiddle (MITM) attacks?
Explain the concept of Secure Sockets Layer (SSL) and Transport Layer
Security (TLS) in the context of app security.
Can you explain the differences between symmetric and asymmetric
encryption, and when each might be appropriate for securing data?
How would you handle user sessions securely within an app to prevent
unauthorized access and protect user data?
What steps would you take to securely handle and store user consent for
data collection?
How do you implement logging and monitoring to detect and respond to
security incidents in real-time?
What is certificate pinning, and how does it enhance the security of network
communication?
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Chapter 15: Networking
How can you customize URLSession behavior using different
configurations?
How do you handle errors and responses in URLSession tasks?
When and why would you use background URLSession tasks?
How can you configure caching behavior in URLSession requests?
How do you handle basic authentication and token-based authentication?
How do you handle SSL pinning and secure network communication?
Where you might need to cancel an ongoing network request and how
URLSessionDataTask cancellation is implemented?
How do you ensure that multiple network requests are executed concurrently
without affecting performance or stability?
What are the advantages of using URLSession over other networking
libraries like Alamofire?
Can you explain the difference between data tasks, download tasks, and
upload tasks in URLSession?
What are the things you do to optimize network performance?
How would you implement automatic token refreshing using URLSession to
ensure seamless user authentication?
How would you handle interruptions such as network errors during the
download process of a large file?
How would you implement resumable downloads for large files using
URLSession to allow users to pause and resume the download process?
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Chapter 16: UIViewController Life-Cycle
When are the viewWillLayoutSubviews() and viewDidLayoutSubviews()
methods called during the lifecycle? How are they useful in managing the
layout of subviews?
Explain a situation where you might use the viewWillAppear(_:) and
viewDidAppear(_:) methods together.
What role does viewWillTransition(to:with:) play in handling device
orientation changes?
When is loadView() called during the View Controller Lifecycle?
How does iOS handle memory warnings, and how does it affect view
controllers?
How does the View Controller Lifecycle change when it becomes a child of
another view controller?
How does presenting a view controller modally affect its View Controller
Lifecycle?
Describe the differences between the layoutIfNeeded() and
setNeedsLayout() methods.
What is the role of the viewDidLoad method and what tasks are typically
performed in this method?
Explain the concept of lazy loading related to the view controller lifecycle.
What should you consider when performing UI updates in the
viewWillAppear and viewDidAppear methods?
How can you ensure that a view controller properly removes its notification
observers to prevent memory leaks?
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Chapter 17: App Performance
Can you share any experience you have with implementing caching
mechanisms to improve app performance?
Have you encountered any challenges with image loading and rendering
performance in iOS apps? How did you address them?
In what scenarios would you consider using background processing or
multithreading to improve app performance? Can you provide examples?
Can you discuss your approach to optimizing battery consumption in iOS
apps, especially those running in the background?
How do you ensure smooth scrolling and responsiveness in table views and
collection views?
How do you handle memory management in iOS applications, especially in
scenarios where memory leaks may affect performance?
Have you utilized any specific techniques or libraries to improve app startup
time? Can you elaborate on your experience?
Can you explain the importance of tools like Instruments, Xcode Profiler, and
other performance monitoring tools in iOS development?
How do you manage and optimize the loading and rendering of large data
sets in table views or collection views?
Can you explain the role of lazy loading and prefetching in optimizing the
performance of list-based UI components?
What strategies do you employ to reduce app size and improve
download/install times for iOS applications?
Can you discuss the impact of third-party libraries and dependencies on app
performance?
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Chapter 18: Concurrency
Can you explain the difference between DispatchQueue.main.async and
DispatchQueue.main.sync?
What is the use of actors in Swift concurrency? How do they help in
managing shared mutable states in concurrent code?
Explain the difference between synchronous and asynchronous tasks in
Swift. When would you use each?
Can you give an example where implementing concurrency improved app
performance or responsiveness?
Explain the concept of dispatch queues in GCD. What are the different types
of dispatch queues, and when would you use each?
What is the difference between a serial and a concurrent queue in GCD?
Can you provide a scenario where you would prefer one over the other?
How does Swift's async/await model differ from using GCD?
Discuss the use of DispatchGroup in GCD. Can you provide an example of
how you would use it to manage asynchronous tasks?
What are some common pitfalls or mistakes you might encounter when
working with concurrency in Swift, and how do you avoid them?
Can you explain the async/await pattern introduced in Swift concurrency?
How does it improve on traditional asynchronous programming techniques?
Discuss the concept of task cancellation in Swift concurrency. How do you
cancel asynchronous tasks safely and efficiently?
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Chapter 18: Concurrency
Can you explain how error handling works with async/await, and what are the
best practices for handling errors in asynchronous tasks?
Discuss the concept of structured concurrency in Swift. How does it help in
managing asynchronous tasks more effectively?
What are Swift actors, and how do they differ from traditional concurrency
mechanisms like locks and semaphores?
Can you discuss techniques such as batching, debouncing, throttling, and
prefetching in the context of concurrent programming?
Discuss the purpose of the wait() and signal() methods in
DispatchSemaphore. How do they work to control access to the semaphore?
What are some common use cases for DispatchSemaphore in iOS
development? Can you provide examples where using DispatchSemaphore
improved the performance or reliability of your code?
Explain the role of RunLoop in managing event processing in iOS
applications.
How does RunLoop help in managing asynchronous events such as user
input, timers, and networking tasks?
Explain how RunLoop and DispatchQueue handle task scheduling and
execution differently.
How does Swift decide whether to use static dispatch or dynamic dispatch
for a method call?
What are the performance implications of static dispatch versus dynamic
dispatch in Swift?
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Chapter 19: UIKit Framework
Explain the difference between UIView and CALayer, and when would you
prefer CALayer?
Can you explain the difference between masksToBounds and
clipsToBounds?
What is the difference between frame, bounds, center, and transform
properties when applying transformations?
How does Core Animation enable smooth animations in CALayer?
How does UIKit optimize the rendering process of UIView and CALayer for
performance?
How do you handle conflicts and ambiguity in Auto Layout?
How does the responder chain work, and what role does it play in event
handling?
How do delegate and data source facilitate communication between objects?
What are the different methods of passing data between view controllers?
How do you implement a custom delegate protocol to pass data backward
between view controllers?
Explain about the Responder Chain and how it works?
Why IBOutlets are weak?
What is intrinsic content size, and how does it affect Auto Layout?
How do content hugging and compression resistance priorities influence
layout?
Explain the pros and cons of creating constraints programmatically versus an
Interface Builder.
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Chapter 19: UIKit Framework
How would you implement dynamic cell heights in a UITableView efficiently
with varying content sizes?
How do you test and debug issues related to dynamic cell heights in a
UITableView?
What are the steps involved in adding new language support to your app?
How do you support right-to-left (RTL) languages in the app?
Explain the purpose of the makeKeyAndVisible() method in UIWindow.
How does UIWindow differ from UIView in iOS apps?
How does UINavigationController manage its stack of view controllers?
Explain with an example.
How do you customize the appearance of a UINavigationBar within a
UINavigationController?
What are the benefits of creating reusable UI components in iOS apps?
Can you explain how to make complex UI in a better way to make it reusable
and flexible?
Explain how you can optimize the performance of data fetching and parsing
operations to display it on a view controller.
How would you implement prefetching in UITableView for a smooth user
experience? How can it improve performance?
What is the purpose of prepareForReuse() in UITableViewCell? Why is it
important for improving performance?
How do you implement support for dynamic font sizes while using multiple
custom fonts in your app?
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Chapter 20: SwiftUI Framework
What are the benefits of using the @State property wrapper? Can you explain
scenarios where it's particularly useful?
How do you handle data flow in SwiftUI? Discuss the roles of @Binding,
@ObservedObject, and @EnvironmentObject.
Explain the concept of declarative syntax in SwiftUI. How does it impact the
development process compared to imperative approaches?
What is the role of the View protocol in SwiftUI?
What is the purpose of the @Environment property wrapper in SwiftUI?
How does SwiftUI handle navigation within an application? Compare
techniques such as NavigationLink and NavigationView.
Explain the concept of ViewModifiers in SwiftUI. How do they enhance the
reusability and maintainability of code?
How do you optimize SwiftUI views for better performance?
Explain the purpose of NavigationView and NavigationLink in SwiftUI
navigation.
Describe the role of the ObservableObject protocol in SwiftUI and how it's
used.
What are some advantages of using @FetchRequest in SwiftUI for Core Data
integration?
Describe how GeometryReader is used in SwiftUI layouts.
Discuss the use of @AppStorage and @SceneStorage in SwiftUI for
persistent data storage.
Discuss the advantages and disadvantages of using SwiftUI compared to
UIKit.
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Chapter 20: SwiftUI Framework
How do you implement API calls and parse JSON in SwiftUI?
What is the role of containers in SwiftUI?
Explain how you would troubleshoot issues in SwiftUI’s preview pane.
Why SwiftUI uses struct for view and not class?
What challenges have you faced while working with SwiftUI?
What is the difference between .task() and .onAppear() in SwiftUI?
How do you use UIKit components in a SwiftUI project?
What do you understand by declarative programming and explain how
SwiftUI is based on a declarative approach?
How does an observable object announce changes in SwiftUI?
In SwiftUI, how do you handle localization and internationalization?
Can you explain how SwiftUI manages view updates and rendering
optimizations?
How does SwiftUI support dynamic type and adaptability to different device
sizes?
Can you explain how zIndex() works in SwiftUI for UI rendering?
Can you explain how ViewBuilders work and provide an example of when
you might use them to create custom layout structures in SwiftUI?
Copyright @Swiftable 2024, All Rights Reserved
Chapter 21: Miscellaneous
Discuss the limitations of using extensions.
How do you declare a type alias? What are some common scenarios where
type aliases are particularly useful?
How does the Swift compiler optimize performance when using immutable
collections?
Explain the impact of using the append() and insert() functions on
collections?
What is the difference between a for-in and for-each loop?
How can you customize the encoding and decoding behavior when working
with JSON?
Can Codable handle date formatting? If so, how?
How would you deal with cases where JSON keys don't match your property
names?
How to observe changes to a property using KVO? Provide a practical
example.
Explain how you can unregister KVO observers and why it's important to do
so. Provide examples of scenarios where failure to unregister observers can
lead to issues.
Can you explain how KVO can be used in conjunction with the SwiftUI or
Combine frameworks?
Explain the difference between AppDelegate and SceneDelegate.
Explain the difference between Equatable and Comparable protocols.
How does the use of the final keyword impact method dispatch?
What are some ways to ensure thread safety in Singleton implementations?
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Chapter 21: Miscellaneous
Explain the difference between an array and a set. When using a set, is it a
good choice?
What are tuples? Explain its best usage with an example.
How do you use API availability and handle the fallback condition?
What are the in-out parameters and when are they useful?
Discuss various methods for unwrapping optionals.
Explain forced unwrapping and discuss situations where it's appropriate and
when it should be avoided.
What is the type of optional? Is it a class, a struct or an enum?
Explain the difference between Any, AnyObject and Generic?
How equality (==) is different from identity (===) when using the Equatable
protocol?
Discuss issues like tight coupling, difficulty in testing, and potential
challenges of singletons.
Discuss situations where singletons are appropriate.
What is the difference between self and Self?
What is the use of @DiscardableResult? When are they useful?
How does the open access level differ from the public?
Explain the significance of the internal access level. When is it typically
used?
What is the default access level for properties, methods, and classes?
How does access control impact inheritance?
Discuss scenarios where you might use fileprivate instead of private.
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