Swift & iOS Online Test

Q: What are the main iOS development tests?

We offer several iOS-related tests: iOS Online Test Swift Online Test Appium (iOS) Test

The Swift iOS Test is designed to assess the candidate's knowledge of Swift programming language and its application in iOS development. The test uses scenario-based MCQs to evaluate the candidate's proficiency in key areas like syntax, memory management, protocols, and frameworks like UIKit, Foundation, and Core Data. The test also includes a coding question to evaluate hands-on programming skills.

Covered skills:

Swift Syntax
Memory management in Swift
Error handling in Swift
Data structures in Swift
Networking in iOS
User Interface design in iOS
Core Data framework
Concurrency in iOS
Swift Programming

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About the Swift & iOS Test

The Swift & iOS Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Understanding and applying Swift syntax effectively
Managing memory in Swift efficiently
Handling exceptions and errors in Swift accurately
Working with various data structures in Swift
Implementing networking in iOS applications
Designing user interfaces in iOS effectively
Utilizing the Core Data framework for data management
Understanding and implementing concurrency in iOS
Proficient in Swift programming

1200+ customers in 80 countries

Use Adaface tests trusted by recruitment teams globally. Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

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Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this Swift & iOS Test will be non-googleable.

🧐 Question
Medium Data Provider DispatchQueue Closures Asychronous operations.	Solve
Consider the following code snippet: What will be printed after the code execution?
Medium Property Observers OOPs	Solve
Consider the following Swift code snippet: What does the code print after execution? A) 800, -100, 80, 80 B) 800, 800, 80, 72 C) 1000, 800, 100, 72 D) 800, 800, 80, 80 E) 800, 0, 80, 80
Medium Class Destructor OOPs Memory Management Object-oriented Programming	Solve
What does the following Swift code output?
Easy Defer blocks	Solve
What does the following Swift code output?
Easy Lazy Variables	Solve
What does the following Swift code output?
Medium Completion Handlers Views Animations Ios (Swift) View Lifecycle	Solve
Consider the following iOS (Swift) code snippet: What will happen when this view controller appears? A) The squareView will move 100 points to the right instantly and then change its background color to blue. B) The squareView will not move, and its background color will not change. C) The squareView will change its background color to blue instantly and then move 100 points to the right over 1 second. D) The squareView will move 100 points to the right and change its background color to blue simultaneously over 1 second. E) The squareView will move 100 points to the right over 1 second, and the background color will change to blue after 1 second.
Medium UI Responder Chain UI Views Interaction.	Solve
Consider the following iOS (Swift) code snippet: When the user taps on the CustomButton, what will be the output? Note that UIButton is a subclass of UIControl by default. A) Only "CustomButton touchesBegan" will be printed. B) "CustomButton touchesBegan" and "CustomView touchesBegan" will be printed. C) "CustomButton touchesBegan", "CustomView touchesBegan", and "ViewController touchesBegan" will be printed. D) "CustomButton touchesBegan" and "ViewController touchesBegan" will be printed. E) No output will be printed.
Medium ViewController Buggy Code Code Review Ios Development	Solve
Here's two different ways to write the same code in iOS (Swift): Which of the following statements are correct?
Easy Registration Queue Logic Queues Sorting By Custom Order	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
Medium Visitors Count Strings Logic String Parsing Character Counting	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Medium Data Provider DispatchQueue Closures Asychronous operations.	3 mins Swift	Solve
Consider the following code snippet: What will be printed after the code execution?
	Medium Property Observers OOPs	2 mins Swift	Solve
Consider the following Swift code snippet: What does the code print after execution? A) 800, -100, 80, 80 B) 800, 800, 80, 72 C) 1000, 800, 100, 72 D) 800, 800, 80, 80 E) 800, 0, 80, 80
	Medium Class Destructor OOPs Memory Management Object-oriented Programming	2 mins Swift	Solve
What does the following Swift code output?
	Easy Defer blocks	2 mins Swift	Solve
What does the following Swift code output?
	Easy Lazy Variables	2 mins Swift	Solve
What does the following Swift code output?
	Medium Completion Handlers Views Animations Ios (Swift) View Lifecycle	2 mins iOS	Solve
Consider the following iOS (Swift) code snippet: What will happen when this view controller appears? A) The squareView will move 100 points to the right instantly and then change its background color to blue. B) The squareView will not move, and its background color will not change. C) The squareView will change its background color to blue instantly and then move 100 points to the right over 1 second. D) The squareView will move 100 points to the right and change its background color to blue simultaneously over 1 second. E) The squareView will move 100 points to the right over 1 second, and the background color will change to blue after 1 second.
	Medium UI Responder Chain UI Views Interaction.	3 mins iOS	Solve
Consider the following iOS (Swift) code snippet: When the user taps on the CustomButton, what will be the output? Note that UIButton is a subclass of UIControl by default. A) Only "CustomButton touchesBegan" will be printed. B) "CustomButton touchesBegan" and "CustomView touchesBegan" will be printed. C) "CustomButton touchesBegan", "CustomView touchesBegan", and "ViewController touchesBegan" will be printed. D) "CustomButton touchesBegan" and "ViewController touchesBegan" will be printed. E) No output will be printed.
	Medium ViewController Buggy Code Code Review Ios Development	3 mins iOS	Solve
Here's two different ways to write the same code in iOS (Swift): Which of the following statements are correct?
	Easy Registration Queue Logic Queues Sorting By Custom Order	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Medium Visitors Count Strings Logic String Parsing Character Counting	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Data Provider DispatchQueue Closures Asychronous operations.	Swift	Medium	3 mins	Solve
Consider the following code snippet: What will be printed after the code execution?
	Property Observers OOPs	Swift	Medium	2 mins	Solve
Consider the following Swift code snippet: What does the code print after execution? A) 800, -100, 80, 80 B) 800, 800, 80, 72 C) 1000, 800, 100, 72 D) 800, 800, 80, 80 E) 800, 0, 80, 80
	Class Destructor OOPs Memory Management Object-oriented Programming	Swift	Medium	2 mins	Solve
What does the following Swift code output?
	Defer blocks	Swift	Easy	2 mins	Solve
What does the following Swift code output?
	Lazy Variables	Swift	Easy	2 mins	Solve
What does the following Swift code output?
	Completion Handlers Views Animations Ios (Swift) View Lifecycle	iOS	Medium	2 mins	Solve
Consider the following iOS (Swift) code snippet: What will happen when this view controller appears? A) The squareView will move 100 points to the right instantly and then change its background color to blue. B) The squareView will not move, and its background color will not change. C) The squareView will change its background color to blue instantly and then move 100 points to the right over 1 second. D) The squareView will move 100 points to the right and change its background color to blue simultaneously over 1 second. E) The squareView will move 100 points to the right over 1 second, and the background color will change to blue after 1 second.
	UI Responder Chain UI Views Interaction.	iOS	Medium	3 mins	Solve
Consider the following iOS (Swift) code snippet: When the user taps on the CustomButton, what will be the output? Note that UIButton is a subclass of UIControl by default. A) Only "CustomButton touchesBegan" will be printed. B) "CustomButton touchesBegan" and "CustomView touchesBegan" will be printed. C) "CustomButton touchesBegan", "CustomView touchesBegan", and "ViewController touchesBegan" will be printed. D) "CustomButton touchesBegan" and "ViewController touchesBegan" will be printed. E) No output will be printed.
	ViewController Buggy Code Code Review Ios Development	iOS	Medium	3 mins	Solve
Here's two different ways to write the same code in iOS (Swift): Which of the following statements are correct?
	Registration Queue Logic Queues Sorting By Custom Order	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Visitors Count Strings Logic String Parsing Character Counting	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

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Why you should use Pre-employment Swift & iOS Online Test?

The Swift & iOS Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Swift Syntax
Memory management in Swift
Error handling in Swift
Data structures in Swift
Networking in iOS
User Interface design in iOS
Core Data framework
Concurrency in iOS
Swift Programming
Integrating Swift code with Objective-C

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Swift & iOS Online Test?

Swift Syntax: Swift Syntax refers to the rules and structure of the Swift programming language. It encompasses the various components such as variables, functions, control flow, and object-oriented concepts that enable developers to write efficient and readable code.

Memory management in Swift: Memory management in Swift involves managing the allocation and deallocation of memory resources to ensure efficient memory usage and prevent memory leaks in applications. It includes concepts such as reference counting, automatic memory management with ARC (Automatic Reference Counting), and strong, weak, and unowned references.

Error handling in Swift: Error handling in Swift allows developers to handle, propagate, and recover from errors gracefully. It involves using mechanisms like do-catch blocks, throwing and catching errors, and handling different types of errors, such as runtime errors and domain-specific errors.

Data structures in Swift: Data structures in Swift represent the organization and storage of data in memory. They provide efficient ways to store, access, and manipulate data. Common data structures include arrays, dictionaries, stacks, queues, and linked lists.

Networking in iOS: Networking in iOS involves the integration of network connectivity and communication in iOS applications. It includes concepts such as making HTTP/HTTPS requests, handling response data, implementing RESTful APIs, and using libraries like URLSession or Alamofire for network operations.

User Interface design in iOS: User Interface design in iOS focuses on creating visually appealing, intuitive, and user-friendly interfaces for iOS applications. It involves using the UIKit framework, designing layouts with constraints and auto layout, implementing user interactions, and incorporating design principles to provide a seamless user experience.

Core Data framework: The Core Data framework in iOS provides an object-oriented approach to managing the model layer of an application. It enables developers to store, retrieve, and manipulate data as objects, while handling complex data relationships and providing features like data persistence, versioning, and automatic change tracking.

Concurrency in iOS: Concurrency in iOS involves simultaneously executing multiple tasks or operations to enhance application performance and responsiveness. It includes concepts such as multithreading, Grand Central Dispatch (GCD), operation queues, and synchronization techniques to manage concurrent execution and avoid race conditions.

Swift Programming: Swift Programming encompasses the overall knowledge and proficiency in the Swift language, covering the syntax, language features, best practices, and development techniques. It includes understanding concepts like optionals, closures, generics, protocols, and advanced language features that enable developers to write efficient and maintainable Swift code.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Swift & iOS Test to be based on.

Variables

Constants

Optionals

Control Flow

Functions

Closures

Classes

Structures

Enums

Memory Allocation

Automatic Reference Counting (ARC)

Memory Leaks

Error Handling

Exception Handling

Arrays

Dictionaries

Sets

Linked Lists

Stacks

Queues

Binary Trees

Graphs

HTTP Requests

RESTful APIs

JSON Parsing

URLSession

Alamofire

Auto Layout

Storyboard

XIB

Table Views

Collection Views

Core Data Basics

Entity Relationship

Fetching Data

Updating Data

Deleting Data

Multithreading

Grand Central Dispatch (GCD)

Operation Queues

Dispatch Groups

Concurrency Issues

Delegates

Protocols

Extensions

Generics

Inheritance

Polymorphism

Option Sets

Operator Overloading

Access Control

Type Casting

Tuples

String Manipulation

Error Types

Asynchronous Programming

Networking Concepts

Unit Testing

Debugging

Continuous Integration

Automated Testing

Code Documentation

Swift Package Manager

What roles can I use the Swift & iOS Online Test for?

iOS Developer
Mobile App Developer
Swift Developer
iOS Engineer

How is the Swift & iOS Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Unit testing in Swift
Performance optimization in Swift
Multithreading in iOS
Debugging and troubleshooting in iOS
App store submission process
Memory leaks detection and prevention in Swift
Local and remote notifications in iOS
Caching mechanisms in iOS
Code version control using Git
Internationalization and localization in iOS

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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Have questions about the Swift & iOS Hiring Test?

What is Swift & iOS Test - swift-ios-test?

The Swift & iOS Test - swift-ios-test is designed to assess a candidate's skills in Swift programming and iOS development. This test is ideal for recruiters seeking to evaluate the proficiency of developers in core areas of Swift and iOS. It helps in identifying candidates who are well-versed in Swift Syntax, Memory Management, Error Handling, Data Structures, and various iOS frameworks.

Can I combine Swift & iOS Test with UI/UX Design questions?

Yes, you can request a custom test that includes both Swift & iOS questions along with UI/UX Design questions. Check out our UI/UX Design Test to see how we assess UI/UX Design skills.

What kind of questions are used to evaluate senior candidates in the Swift & iOS Test?

For senior roles, the test includes questions on Unit Testing in Swift, Performance Optimization, Multithreading, Debugging, App Store Submission Process, Memory Leaks Detection, Notifications in iOS, Caching Mechanisms, Code Version Control using Git, Internationalization, and Localization.

How to use the Swift & iOS Test in my hiring process?

We recommend using this test at the beginning of your recruitment. Add a link to the test in your job post or invite candidates directly by email. This helps in shortlisting qualified candidates early in the hiring process.

Can I test Swift and Backend skills together in a test?

Yes, you can. We offer a Backend Engineer Test that can be combined with Swift questions. This combination will help you assess a candidate's comprehensive skills in both areas.

What are the main iOS development tests?

We offer several iOS-related tests:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Non-googleable questions
IP proctoring
Screen proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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