iOS Interview Questions and Answers (with Sample Code)


Curriculum for the course iOS Interview Questions and Answers (with Sample Code)

Top 10 most asked interview questions for an iOS Developer role, in a form of a mock interview. The code from the video: https://github.com/richardtop/ios_interview Follow Richard on social media: https://www.youtube.com/@richardtopchii https://github.com/richardtop/ https://x.com/richardtop_ios Follow Daniel on social media: https://x.com/iDanb0 https://github.com/idanbo ⭐️ Links from the video ⭐️ View Controller Life Cycle https://developer.apple.com/documentation/uikit/uiviewcontroller What’s the difference between a struct and a class https://docs.swift.org/swift-book/LanguageGuide/ClassesAndStructures.html https://github.com/apple/swift/blob/main/stdlib/public/core/Array.swift#L303 https://developer.apple.com/swift/blog/?id=10 What’s the difference between .frame and .bounds property of a UIView https://developer.apple.com/documentation/uikit/uiview/1622621-frame What is a Protocol Oriented Programming https://developer.apple.com/videos/play/wwdc2015/408/ "defer" statement coding question https://docs.swift.org/swift-book/ReferenceManual/Statements.html MVC architecture (Model, View, Controller) https://developer.apple.com/library/archive/documentation/General/Conceptual/DevPedia-CocoaCore/MVC.html https://developer.apple.com/library/archive/documentation/General/Conceptual/CocoaEncyclopedia/Model-View-Controller/Model- View-Controller.html#//apple_ref/doc/uid/TP40010810-CH14 https://developer.apple.com/library/archive/featuredarticles/ViewControllerPGforiPhoneOS/ImplementingaContainerViewController.html "weak" and "unowned" keywords https://kelvas09.github.io/blog/posts/ios_weak_unowned/ https://developer.apple.com/documentation/foundation/urlsession "lazy" keyword https://stackoverflow.com/questions/38141298/lazy-initialisation-and-retain-cycle "@escaping" closure attribue and non-escaping closures https://kelvas09.github.io/blog/posts/ios-escaping/ ❤️ Support for this channel comes from our friends at Scrimba – the coding platform that's reinvented interactive learning: https://scrimba.com/freecodecamp ⭐️ Contents ⭐️ ⌨️ (0:00:00) Overview ⌨️ (0:00:34) Daniel, the interviewer ⌨️ (0:02:03) Why these questions? ⌨️ (0:02:43) View Controller Life Cycle ⌨️ (0:12:08) What’s the difference between a struct and a class ⌨️ (0:18:33) What’s the difference between .frame and .bounds property of a UIView ⌨️ (0:25:58) What is a Protocol Oriented Programming ⌨️ (0:32:16) "defer" statement coding question ⌨️ (0:37:13) GCD / DispatchQueue coding question ⌨️ (0:46:49) MVC architecture (Model, View, Controller) ⌨️ (0:52:32) "weak" and "unowned" keywords ⌨️ (0:57:07) "lazy" keyword ⌨️ (1:02:05) "@escaping" closure attribue and non-escaping closures ⌨️ (1:05:16) Summary and feedback Corrections: 52:19 The video states that unowned references cannot be optional. However, in practice, unowned references may be either optional or non-optional. For official documentation on this topic, refer to: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/automaticreferencecounting/#Unowned-Optional-References 1:01:52 The explanation in the video may lead viewers to incorrectly infer that non-escaping behavior became the default for closures starting with Swift 5.0. The phrase "as of Swift 5.0, the non-escaping behavior is the default" was used solely to clarify the behavior at the time of the interview recording, rather than to specify the exact point at which this change was introduced. The video emphasizes the ability to store a closure in a variable as the defining characteristic of an escaping closure. However, the more precise and official definition is: "A closure is said to escape a function when the closure is passed as an argument to the function but is called after the function returns." This definition correctly highlights the API behavior rather than the implementation details. For further reference, see: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/closures/

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