iOS Developer Interview Questions and Answers

iOS Developer Interview Questions and Answers

iPhone OS (iOS) is a mobile operating system developed and created by Apple Inc. exclusively for its hardware. It is the operating system that presently powers many of the company’s mobile devices, including the iPhone, iPad, and iPod Touch. It is the second most popular mobile operating system globally after Android. The App Store, one of Apple’s native applications found within iOS, is one of the largest mobile marketplaces in the world. Apple provides major updates to the iOS operating system annually via iTunes and also, for iOS 5 and later, over-the-air. Major versions of iOS are released annually. The version, iOS 11, was released on September 19, 2017. It is available for all iOS devices with 64-bit processors; the iPhone 5S and later iPhone models, the iPad (2017), the iPad Air and later iPad Air models, all iPad Pro models, the iPad Mini 2 and later iPad Mini models, and the sixth-generation iPod Touch. Apple announced iOS 12 on June 4, 2018, at its annual Apple Worldwide Developers Conference (WWDC) event. Apple will continue support for all devices supported by iOS 11. They will add performance enhancements across all devices served by iOS 11. Features announced coming to iOS 12 include Siri Shortcuts, Group FaceTime calls, Memoji, and more an organized Lock Screen that hides multiple messages from the same person or a group of people in conversations. Apple announced iOS 13 on June 3, 2019, at its annual Apple Worldwide Developers Conference (WWDC) event, and it was released to the public on September 19, 2019

What is iOS?

What is object C?

What is Swift Programming Language?

What is Cocoa?

What is CocoaTouch?

What is CocoaPods?

What is Xcode?

What is Reveal?

What is the short cut to open the “Code Snippet Library” in Xcode?

What are the source items used by Xcode?

What is TVMLKit?

What is Health Kit?

What is tvOS?

What is Platform limitations of tvOS?

What is Core Data?

Why is design pattern very important?

What options do you have for implementing networking and HTTP on iOS?

Explain MVC?

What is JSON/PLIST limits?

What is the difference between bounds and frame?

How is memory management handled in iOS?

What is Protocol Extensions?

What is optional chaining?

What is accessibilityHint?

What is CoreSpotlight?

What is encapsulation?

What is KVC and KVO?

What is a memory leak?

How do you manage dependencies?

What is Singleton Pattern?

What is the difference between active, inactive, not-running, background and suspended execution states?

What is the difference between viewDidLoad and viewDidAppear?

What is App IDs and Bundle Identifiers?

What are benefits of Guard?

What is the difference between using a delegate and notification?

What are the options for laying out UI on iOS?

What options do you have for implementing storage and persistence on iOS?