UIKit interview questions

View controller lifecycle, Auto Layout, lists and collections, hit-testing and navigation in UIKit.

– interview-ready · 13 questions in this topic

– of 13 tried

Saved on this device. Interview-ready means you got it right on two different days. Guesses and hints count for less.

Questions

Flip, then say if you knew it. Needs JavaScript; every answer is also on its question page.

One exercise per question, checked as you go. Needs JavaScript.

Timed, out loud, then tick what you covered. Needs JavaScript.

Review a diff like a senior: flag the lines you'd comment on. Needs JavaScript.

Recall the answer first, then tap Show to check.

UIStackView
Arranges subviews in a row or column using Auto Layout. It has no background of its own before iOS 14 and adds no extra drawing.
Safe area
safeAreaLayoutGuide and safeAreaInsets keep content clear of the notch, Dynamic Island, home indicator and bars.
UINavigationController
Manages a stack of view controllers with push and pop, a navigation bar and a back gesture.
UIPageViewController
Pages between view controllers with scroll or page-curl transitions; supply them through a data source.
UISplitViewController
Primary and secondary (plus optional supplementary) columns on iPad and Mac; collapses on iPhone.
NSAttributedString
Text with per-range attributes (font, colour, links). In Swift, AttributedString (iOS 15) is the value-type alternative.
draw(_:)
Override only for custom Core Graphics drawing; it is CPU-bound, so prefer layers or images for static content.