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iOS is a mobile operating system created and developed by Apple Inc. exclusively to power mobile devices that include iPhone, iPad and iPod Touch. It stands next in the line of popularity after Android across the world. In 2008, iPhone was released for third party app development and since then the iOS developers who develop the millions of iOS apps has only increased exponentially.

For recruiters and IT companies looking to hire iOS developers, this growing population of the iOS developers is both a boon as well as a bane. While there is an assurance of finding high-quality talent, finding the right candidate with the required skills and necessary experience has become very difficult.

This platform has two programming languages that include Objective-C and Swift. In addition to being proficient in one of them, good iOS developers must also have a strong understanding of the patterns and practices of the iOS platform. They must be aware of the different options available to implement a solution and also the benefits and shortcomings of these options in terms of scalability, productivity, performance and maintenance.

iOS Swift is an advanced and intuitive language with a concise and expressive syntax encompassing diverse qualities. The first step in recruiting talented iOS developers begins with the right job description. A relevant coding assessment will help select the ideal candidates for a face-to-face interview. A list of iOS interview questions in hand will help the recruiters judge the candidates quickly and reliably on the skills they are looking for. Check out the next section where we have listed a few of the important iOS interview questions in Swift for ready reference.

Sample Swift iOS Developer Interview Questions

Q1. Which of the following is used to create a mutable object?

  1. Var
  2. Let
  3. Both a & b
  4. Neither a or b

Ans: a. Var

Q2. What keyword is used to create Constants in Swift?

  1. Constants
  2. Let
  3. Conts
  4. None of the above

Ans: b. Let

Q3. Which JSON framework is supported by iOS?

Ans: SBJson framework is supported by iOS.

Q4. Elaborate on the differences between Swift and Objective-C.

Ans: Differences between Swift and Objective-C are as follows:

  • Swift is an object-oriented, functional programming language, whereas Objective-C is a class-based object-oriented programming language
  • Swift supports dynamic libraries, whereas Objective-C does not
  • Swift supports Tuples which is not the case with Objective-C
  • Semicolons are required in Objective-C, whereas they are not necessary in Swift.
  • Swift is an open-source programming language, whereas Objective-C is not and in addition, its use is limited to Apple products alone.
  • Swift allows the definition of methods in structure, classes or enumeration, whereas Objective C does not allow it.
  • Swift allows defining classes in a single file (.swift), whereas in Objective C needs the creation of separate files for interface (.h) and for classes and implementation (.m).

Q5. Where can the apple iPhone apps be tested in the absence of iOS devices?

Ans: In case of unavailability of an iOS device, the application can be tested on simulators provided by Apple on the Mac system.

Q6. What are the tools that are required to develop iOS applications?

Ans: Some of the essential tools required to develop iOS applications are Mac/MacMini, Xcode, Apple developer program and Swift programming language.

Q7. What is a dictionary?

Ans: Dictionaries are an association of an unordered collection of key-value pairs wherein each value is associated with a unique key of hashable type such as a number or string. Dictionaries are used in Swift programming to obtain the values based on a key value.

Defining a dictionary in Swift:

Dictionary<Key, Value> ()


[Key: Value] ()


Creating a dictionaries in Swift:

// using Dictionary

Var names = Dictonary<String,Int> ()

Names = [“Arpit”: 1, “Sujit”: 2]


// it prints [Arpit: 1, Sujit: 2]

Q8. Which of the following is used to return multiple values in Swift from Function?

  1. Array
  2. Tuple
  3. Double
  4. None of the above

Ans: b. Touple

Q9. In which iOS version was multitasking introduced?

  1. iOS 2.0
  2. iOS 4.0
  3. iOS 7.0
  4. iOS 6.0

Ans: b. iOS 4.0

Q10. Choose the command that is used for displaying the syntax for the clock command?

  1. clock?
  2. cl?
  3. clock ?
  4. cl ?

Ans: c. clock ?

Applications of MeritTrac Assessment Solutions

With the help of MeritTrac’s end-to-end assessment solutions, recruiters can measure the skills and knowledge of the candidates in Swift and select the right talent for a face-to-face interview. They can have a list of Swift interview questions to further assess the capability and suitability of the candidates for the job role.

The learning and development department can use MeritTrac’s assessment solutions to evaluate the skills of the existing developers. The results of the assessment can help them design training programs to fill skills gaps if any.

MeritTrac Platform for iOS Developer Assessment

Be it recruitment or workforce development, MeritTrac has the right assessment solutions. From designing the suitable iOS developer test to complete exam administration and the result compilation and analysis, we take care of every step in the recruitment process.

CodeTrac, a performance-based coding platform with real-time feedback mechanism is used to administer the iOS developer tests. CodeTrac allows recruiters to assess the candidates’ coding skills for performance benchmarking and effective recruitment. It helps companies design an efficient developer recruitment cycle, bridge skill gaps for employee career progression and come up with various coding scenarios to pick the right candidates for unique business needs.

CodeTrac is a unified assessment platform with an all-inclusive software development feature for full-stack software development assessment. It allows candidates to be assessed on projects rather than standalone programs to gauge their capabilities in a broader perspective.


FAQ for IOS Interview Questions

1. How do I prepare for iOS developer interview?

Learn how to respond to inquiries like "why are you interested in iOS" in a concise manner. Use a whiteboard to brainstorm answers to typical technical interview questions. Discover ways to keep interview preparation and practise going.

2. What is iOS Swift?

Swift is a compiled and new programming language evolved by Apple Inc in June 2014 in order to develop apps for mobile and desktop. This language works for watchOS, macOS, iOS, and tvOS.

3. What are the tools that are required to develop iOS applications?

These are some of the essential tools that we should have

  • Mac/MacMini
  • Xcode
  • Swift Programming Language
  • Apple Developer Program

4. What is Xcode?

Xcode is Apple's integrated development environment (IDE) for macOS, used to develop software for macOS, iOS, watchOS, and tvOS. It includes a code editor, a visual editor for designing user interfaces, debugging tools, and other features to help developers create software for Apple's platforms.

5. What is iOS?

iOS is Apple's mobile operating system that powers iPhones, iPads, and iPod touches. It is a closed-source operating system, meaning that only Apple has access to its source code.

6. What is Swift?

Swift is a programming language developed by Apple for macOS, iOS, watchOS, and tvOS. It is designed to be safe, fast, and easy to learn, and is intended to replace Objective-C as the primary programming language for Apple platforms.