The top 50 iOS interview questions and their responses are listed below. To give you an idea of the kinds of questions that are asked in interviews, Intellipaat experts who teach for the iOS Training Course created these questions. We have made every effort to provide the best responses to all of the queries. Do comment your thoughts. Happy job hunting!.
- What is VIPER ?
- Difference between MVVM and VIPER ?
- What is the role of Interactor in VIPER ?
- What are Bindings ?
- What is dependency injection ?
- What is dependency inversion ?
- What are SOLID principles ?
- What is an iOS Snapshot Test ?
System Design Round (iOS) – Mock Interview | Mobile App Development
1 What are the main features and advantages or disadvantages of Swift?
This might sound like a beginner question, but it’s not. It may be used to determine your knowledge of other languages and your overall perspective on the benefits, drawbacks, and limitations of the language you speak.
Expected answer:
TLDR: Static typing, protocols, reference types, value types, optionals, and generics are the main features of Swift.
Swift’s strongest feature, advantage, and disadvantage all at once may be that it is a strongly typed language. Static typing facilitates development by enabling the existence of protocols, generics, and optionals. However, static typing offers greater runtime safety and determinism (options, var/let, generic or concrete types, etc.) at the expense of numerous compile-time warnings and compilation errors. ). One of the biggest benefits the language offers is this. In the following situations, strict type safety is most beneficial:
The vast majority of customer-facing applications that iOS developers create are all of those.
However, when creating something that needs more flexibility, such as a library or a framework, static typing may be too restrictive. Given that it allows for better meta-programming capabilities than Swift, Objective-C might be a better option in that situation. (Although it could be argued that at this point Swift should be used exclusively for Apple platform development and Objective-C is becoming obsolete.)
Red flag:
As long as you can explain what each feature offers, you’ll be fine. e. Again, though, those are arguably minor language features in comparison to the strict type system, what protocols and generics actually allow you to do in code is not immediately obvious.
Further reading for this question:
2 What is an iOS application and where does your code fit into it?
This is a broad question intended to test your comprehension of what an iOS application is, how the code you write fits into it, and how the iOS system as a whole works.
Expected answer:
We might think the apps we build are something special because they cover a unique use case. But your typical iOS application is just a giant, glorified run loop. It waits for user input and gets interrupted by external signals such as phone calls, push notifications, home gestures/button presses, and other app life cycle events. The only difference is that instead of being just a simple main loop function that gets launched every time the user taps on your app icon, it has a higher level of abstraction, UIApplication, AppDelegate, and SceneDelegate that developers work with.
The remainder of the code you create to implement your app’s business logic is put somewhere in the “trigger points” that our app’s main loop delegated to it via AppDelegate or SceneDelegate. Prior to iOS 13, your application’s AppDelegate was in charge of receiving all external events and launching the UI, but as of iOS 13, all UI-related logic was moved to SceneDelegate.
That’s it. Simple. Your app’s code can be as straightforward as a method or function call or as intricate as VIPER architecture. It’s your choice.
Red flag:
It’s true that when developers think of iOS apps, they typically focus on the MVC code they create and the intricate details of their implementation. However, if you step back and consider everything in its entirety, you can see that iOS apps are nothing more than a run loop.
Further reading for this question:
Top Answers to iOS Interview Questions
CTA
The three sections that make up this blog’s iOS Interview Questions and Answers are listed below: Basic.
Check out this video on iOS Development Tutorial:
| Criteria | Result |
| Type of operating system | Apple proprietary based on Macintosh OS X |
| OS fragmentation | Tightly integrated with Apple devices |
| Security | Heightened security guaranteed |
FAQ
How do I prepare for an iOS interview?
- Learn how to answer questions like “why are you interested in iOS” concisely.
- Examine on a whiteboard how to respond to typical technical interview questions.
- Learn methods to continue practicing and preparing for the interview.
How do I become an iOS architect?
- Learn iOS development fundamentals.
- Enroll in an iOS development course.
- Get familiar with key programming languages.
- Create your own projects to develop your iOS development skills.
- Continue to expand your soft skills.
- Build an iOS development portfolio to showcase your work.
What are the interview questions for iOS?
- What is meant by Enumerations or Enum? …
- What do you understand by Memento Pattern? …
- What is the lazy property in swift? …
- What do you know about TVMLKit? …
- What are the three significant benefits of guard statement? …
- What is the difference between ‘bundle ID’ and ‘app ID’?
How do I prepare for a senior iOS developer interview?
- What are Objective-C categories? …
- How do you manage memory in Swift? …
- What are the common design patterns recommended for iOS applications? .
- What are closures in Swift? …
- List key differences between Swift and Objective-C. …
- What version control system do you use?
