Reciprocal strong references between objects should therefore be avoided to the extent possible. However, when they are necessary, a way to avoid this type of memory leak is to employ weak references. Declaring one of the two references as weak will break the retain cycle and thereby avoid the memory leak. When the above code dispatches work using NSOperationQueue’s method addOperationWithBlock, there is no guarantee that the block being enqueued will be executed on the main thread.
There is no way to prepare for this—debugging is a matter of experience, and that is the point of this part of the iOS developer interview. If you haven’t done some deep research on the company/organization, now is the time to do so. Comb through the company website, look at photos of staff, read the mission statement, and get a feel for the level of formality or informality of the general climate. These things will tell you how to dress for the interview and give you a feel for the overall company culture. Maybe you’ve been working hard on building your personal brand for your career in tech, and it’s great to see it paying off.
Most likely every single interviewer will ask about this regardless whether you’re applying for a senior or junior position. We’ve already created a guide of web developer interview questions, as well as helped budding UX and UI designers and data analysts new to their disciplines become less intimidated by the interview. In this post we’re going to be offering practical advice specifically for those facing their first interview in iOS development.
First of all, an iOS Developer should be deeply familiar with both Objective-C and Swift, the two programming languages used for iOS and Apple products. Objective-C was created in the mid-1980s as an extension of C, and its interoperability with C++ remains one of its biggest draws. Apple created Swift in 2014 specifically for developing software on its operating systems.
Differentiate between UIView’s frame and UIView’s bound?
Since you may have taken advantage of several during your career, it’s wise to discuss each solution you turn to regularly. Additionally, if you can describe use cases and provide examples, your answer will be far more compelling. There are hundreds of battle-proven software development experts in our Talent Network. These are solutions to programming problems like an OOP pattern implemented in the right situation.
Swift, a modern programming language, was announced by Apple Inc. in June 2014. Apple provides excellent tools and resources for developers, making it easier to create high-quality apps for the platform. Apple’s App Store is the most popular app store in the world, so releasing an app on iOS gives it the best chance of being seen and downloaded by potential users. There are a few reasons an interviewer might ask how you came up with the name for your app. First, they could be interested in your branding strategy and how you chose a name that would appeal to your target market. Second, they could be curious about whether you did any market research to ensure that the name you chose was not already in use by another app.
What’s the difference between synchronous and asynchronous tasks within iOS?
Furthermore, it also allows the interviewer to get a better sense of the candidate’s problem-solving skills and their ability to handle difficult challenges. The interviewer is trying to gauge the IOS Developer’s understanding of the app development process and what they believe is the most important part of it. This question allows the interviewer to get a sense of how the IOS Developer prioritizes different aspects of app development and what they think is the most crucial part of creating a successful app. Understanding the IOS Developer’s thought process on this question can help the interviewer understand how they would approach app development projects and whether they would be a good fit for the company. First, they may be trying to gauge the developer’s understanding of the platform and the challenges that come with developing for it. Second, they may be trying to assess the developer’s problem-solving skills and see how they would approach a difficult challenge.
With experience in both private and public sectors, Christina has worked with large, medium-size, and small startup companies. MVC or Model View Controller is a design pattern that defines how logic will be separated when the user interface is implemented. In iOS, UIView is the base class provided by Apple for all views, and UIViewController is provided to support the Controller, which listens to events in a View and updates it when data changes. The best way to prepare is to have at least one good iOS project to showcase and know Swift programming language basics.
What is a singleton?
Objective-C is the primary programming language you use to write software for OS X and iOS. It’s a superset of the C programming language and provides object-oriented capabilities and a dynamic runtime. Objective-C inherits the syntax, primitive types, and flow control statements of C and adds syntax for defining classes and methods. It also adds language-level support for object graph management and object literals while providing dynamic typing and binding, deferring many responsibilities until runtime.
At a minimum, you’ll want to discuss any time you used Git on the job when handling this interview question. As a result, by the time you hit the senior level, you should have some knowledge of it. Automatic Reference Counting — or ARC — is used to manage app memory usage when programming in Swift. The underlying process limits the need for direct or manual memory management, since ARC frees up memory tapped by class instances once the instance isn’t required.
Top 40 Coding Interview Questions You Should Know
The first set of iOS interview questions you may encounter are questions that test your development knowledge. Employers will be looking to see if iOS Developers have a thorough understanding https://wizardsdev.com/en/vacancy/senior-ios-developer-architect/ of Objective-C and Swift, as well as iOS standards and best practices. There is more to interviewing than tricky technical questions, so these are intended merely as a guide.
- A single Xcode project can have multiple Targets and therefore output multiple apps.
- On iOS, we have all of the traditional “manual” debugging tools available such as NSLog/print functions to print information in the console.
- In a broader sense, it occurs when we must manage several tasks at roughly the same time.
- Knowing how to assess their skills properly will help them improve.
- If, for example, the staff are working in jeans and t-shirts, you know that a polo shirt and slacks will be fine.
- In iOS, UIView is the base class provided by Apple for all views, and UIViewController is provided to support the Controller, which listens to events in a View and updates it when data changes.
Instead of just opening a mobile app and navigating to a specific page inside it, this technology instantaneously integrates mobile applications, giving users direct access to services. These basic iOS interview questions and answers are an excellent resource for beginners with little experience working with iOS or basic knowledge of iOS concepts. An iOS developer is responsible for creating, testing, and improving applications for iOS on mobile devices. Apple comes out with a new iPhone almost every year, so you could imagine the demand for iOS developers. Customers demand user-friendly and intuitive iOS applications now more than ever.