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UIKit interview questions for senior iOS engineers
Even in a SwiftUI-first world, senior interviews probe UIKit depth because most production apps still run on it. These are the areas that reveal experience.
The UIKit areas that reveal seniority
Expect the view and view-controller lifecycle, the responder chain and event handling, main-thread-only UI rules, cell reuse, Auto Layout and constraint debugging, and memory management with delegates and closures. Interviewers may ask how you would refactor a massive view controller or manage navigation and dependencies in a large UIKit app.
How to stand out
Tie answers to real problems you have debugged: a leak from a strong delegate, a main-thread violation causing UI glitches, or a table view flickering from reuse. Show you can bridge UIKit and SwiftUI deliberately and reason about migration cost. Depth plus production stories is what distinguishes a senior UIKit answer.
Go deeper than a summary
Share Your Screen works topics like this through in full: 75 solved Swift problems with tests, 9 real case studies, and 7 annotated mock interviews, so you rehearse the live round instead of just reading about it.
Frequently asked
Do senior iOS interviews still cover UIKit?
Yes. Most production apps still rely on UIKit, so interviewers probe lifecycle, reuse, the responder chain, threading rules, and Auto Layout debugging.
What UIKit knowledge matters most now?
Lifecycle and threading rules, cell reuse, memory management with delegates and closures, Auto Layout debugging, and bridging cleanly to SwiftUI.