Got an interview for the position of iOS developer, and are anxious about what questions you will be asked? Don’t worry, we got you covered. Here are some of the important questions that are expected to be asked during the interview of the position for iOS developer.
Apps for Apple’s iOS operating system is created by iOS developers. Swift or Objective-C are the programming languages used by iOS, therefore an iOS developer must know at least one of them. Your programming skills, iOS understanding, will all be put to the test during the interview process for an iOS Developer employment. Some iOS Developer interviews may include a lot of technical questions, while others will focus on your previous experiences.
TOP iOS DEVELOPER INTERVIEW QUESTIONS
We’ve collected a list of frequently asked iOS Developer interview questions to help you prepare for the wide series of questions that may be asked during your interview.
- Objective-C and Swift: Can you briefly describe their differences?
- What are the differences between functions and methods in Swift?
- What is difference between as?, as! and as in Swift?
- Explain the difference between raw and associated values in Swift.
- What is the difference between not-running, inactive, active, background, and suspended execution states?
- Can you talk about the difference between strong, weak, read-only, and copy?
- What’s the difference between synchronous and asynchronous tasks within iOS? (You can be asked a follow up question based on your answer. Eg; Under what conditions would you designate a task as synchronized?)
Briefly explain what the terms are. Define these terms. Give advantages and disadvantages, and also comparison between these terms. Conclude your answer on which is more proficient and reliable to use, also give your opinion on which term you would prefer more and why. These all are technical question.
- Determine the value of “x” in the Swift code below. Explain your answer.
- Find the bug in the Objective-C code. Explain your answer.
- Rewrite the code in a Swift way
- You’ve just been alerted that your new app is prone to crashing. What do you do?
You may be given a series of code, and you will have to give a practical demonstration, as well as a theoretical answer on how you solved the code.
- What is the function of a completion handler, and how do you use it when developing iOS applications?
- What steps do you take to ensure the usability in designing an iOS application?
- How to deal with retain cycles in Closures?
- How is the property @dynamic used in objective-C processes?
- What does the @synthesize command do with objective-C?
- What is the purpose of managed object context (NSManagedObjectContext) in Objective-C and how does it work?
- Explain the purpose of the reuseIdentifier in the UITableViewCell constructor
Hybrid technical and operational question. Define the term and then discuss how that term is used, what is the purpose of it. For some question give your opinion on how would you solve the given question.
- Can you describe what enum or enumerations are? (Follow up question e.g.; Why is it recommended that you not use a strong for enum property in objective-C?)
- What do you understand by Memento Pattern?
- What are Objective-C Categories?
In these kinds of questions always be specific where you have to describe a term. (If there are two terms asked in one question, give a quick brief comparison for both of them.) Don’t exceed your answer.
- Please define the term dynamic dispatch and discuss how it is used.
- Explain when to use various storage mechanisms in iOS?
- What options do you have for implementing storage and persistence on iOS?
- When would you use Core Data over NSUserDefault?
- What are UI elements and some common ways you can add them to your app?
- What are some common execution states in iOS?
This is a detailed based question, where instead of just defining the term, for some questions you will have to discuss it as well giving all the pros and cons and also how to use it.
We hope this series of questions would help you for your coming interviews. Make sure to practice every question and be prepared for any question. You got this!
Until next time, with another topic. Till then, Toodles.