Massive View Controller refers to that state of the codebase when excessive logic and responsibility are given to View Controllers that are not supposed to shoulder that responsibility. As a result, the code may become rigid, bloated, and difficult to alter. As a remedy, one can use design patterns such as Coordinator, MVP, and MVVM. For scaling the iOS code and avoiding this type of problem, architectures like VIPER and RIBs can be used. It will be safe to say that making a career in iOS will be a safe bet.

ios developer interview questions

It’s notable how child view controllers can also make our code reusable because the child can be used in other parent view controllers. A background state is where most apps enter briefly on their way to being suspended. Although, an application that requests extra execution time may remain in this state for a certain period. Apart from an application being launched directly into the background, it enters the background state instead of the inactive state. It is a mechanism that enables the program to decide during runtime what implementation of a method or function to call.

What are some iOS implementation options for persistence and storage?

The object is destroyed when that’s no longer the case, and your weak property is then set to zero by default. Synchronous API calls entails pausing the code execution and waiting for the API call to complete. This means your application won’t continue to run until the API returns a response, which the user may experience as latency or performance lag. However, synchronous API calls can be advantageous if your app functions only once the API response has been received. The Singleton pattern is a design pattern that ensures only one instance exists for a given class and that instance has a global access point.

  • To decide which of the two references should be weak, think of the objects in the retain cycle as being in a parent-child relationship.
  • While atomic properties are slow but thread-safe, only one thread is accessed by the variable(static type).
  • At this position, you can instantiate any instance variable and build any views that remain on the device of this view controller.
  • And, the involvement of an iOS developer depends on their seniority level.
  • These are usually provided by the classes, structures, and enumerations.
  • It appears this way because once the App ID is created in the Member Center, you only ever use the App ID Prefix which matches the Bundle ID of the Application Bundle.

There are many points to look at when recruiting technical talent. Your hiring team also needs to design an interview that will allow you to assess the candidates’ skills. The explosive adoption of smartphones and tablets over the last ten years is one of the most massive technological shifts of our lifetimes. This propelled the rise in demand for mobile applications, and, as a result, mobile app developers. One of the technologies for starting tasks asynchronously is Grand Central Dispatch (GCD) that relegates thread management down to the system level. All the developer has to do is define the tasks to be executed and add them to the appropriate dispatch queue.

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An iOS developer always discovers, evaluates, and implements new technologies for maximum efficiency. It performs very well on tasks that must execute within a short time. It also manages execution tasks, monitoring, and all-controlling process. Apple uses Objective-C as an object-oriented programming language.

ios developer interview questions

This builds trust for the users who know that the application is signed by a verified Apple Source and no changes were made to it since signing. If you have been searching for advanced iOS interview questions for an upcoming iOS interview, stop here. If you are looking to interview candidates for an iOS interview, instead, you are still in the right place. This specially curated list of iOS interview questions will be helpful for anyone who wants a refresher of such questions. Firstly, they may be trying to gauge the developer’s understanding of the market and what makes a successful app.

Mention what are the new features in Xcode 6?

Nurture your inner tech pro with personalized guidance from not one, but two industry experts. They’ll provide feedback, support, and advice as you build your new career. Our career-change programs are designed to take you from beginner to pro in your tech career—with personalized support every step of the way. Start today by requesting a demo or posting a job for free to discover how Workable can help you find and hire great people. The “Subject” in the Observer design pattern keeps track of all the Observers waiting for Subject updates.

ios developer interview questions

A common use case is an app that has both lite/free and pro/full versions or is branded multiple ways. However, if you have already given an iOS interview, or have more questions, we encourage you to add them in the comments tab below. Dan is a software architect and technology professional focusing on applications of blockchain technologies.

Swift Tutorial: Getting Started With iOS Development Using Swift

In KVO, an object may request to be informed of any adjustments to a particular property, and the observer is automatically notified if that property’s value changes. A design pattern in programming where you can only use one instance per class. This is a framework provided by Apple that deals with multiple threads.

For example, if you want to fetch data from an API, you can use GCD to perform fetch tasks asynchronously. An iOS developer is an in-demand career that offers good salaries and job security. IOS developers perform challenging projects and contribute to different projects. There are huge job opportunities in the iOS field that provide good packages and better career growth in development.

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Researching questions beforehand can help you give better answers during the interview. Most interviews will include questions about your personality, qualifications, experience and how well you would fit the job. In this article, we review examples of various ios developer interview questions and sample answers to some of the most common questions. Don’t worry if your answers to questions like this are short and to the point.

The content could be a particular section of a page, a view, or a certain tab. Cocoa is an application framework for building applications for Mac OS, whereas Cocoa touch is used for building applications that run on iPad and iPhones (iOS). An autorelease pool is a stack-like structure that manages the release of objects.