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iOS Interview Questions

An Overview of iOS

iOS, formerly known as iPhone OS, is a mobile OS created and developed by Apple for its hardware. This operating system powers most of Apple’s devices, including iPhones, iPads, and iPod Touch. iOS is the world’s second most popular mobile OS after Android. The iOS UI is based on direct manipulation by using multi-touch. Apple has been active in including accessibility functions into iOS that even enable users with vision and hearing disabilities to use its products properly. If you have read our IOS interview questions, you can find your next dream job soon.

Development History

iOS was unveiled in 2007 by Apple for its iPhone. Since then versions have been released annually.

Latest Version: The latest version is iOS 12, which was released in September 2018. Memorize this information for IOS interview questions and answers.

Advantages

  • User-friendly
  • Intuitive and fluid responsive
  • Excellent UI that works equally good for all purposes - media entertainment, gaming and business.
  • Less heat generated as compared to Android.
  • Best-in-class security.

iOS Interview Questions and answers

Looking for a new job? Do not miss to read our iOS Interview Questions and answers. Whether you are a fresher or an experienced, these questions and answers that can help you to crack your interview.

You can use the UIKit framework to develop application’s UI. This framework provides drawing model, event handling, views, windows and controls, designed for touch screen interfaces.
This framework provides essential infrastructure for constructing and managing iOS apps, such as view and window architecture for managing user interface, event handling infrastructure to respond to user input, and a model to drive run loop and communicate with the system.

It groups together similar rows that differ in content, but have similar layouts in a UITableView. A UITableView allocates sufficient UITableViewCell objects to just display the content that is visible in the table.
If you set reuseIdentifier to non-nil value, then UITableView will attempt to reuse an allocated UITableViewCell using the same reuseIdentifier when you scroll the table view.
If you do not set the reuseIdentifier, the UITableView will allocate new UITableViewCell objects for new items that will scrolls into view.

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