UITableView / iOS Timer Table View with Cell Visibility Tracking

Phone ScreenRobinhoodLast reported August 2025Low Frequency
Reported
2× across candidate reports
First seen
July 2025
Last reported
August 2025
Reported outcome
unknown

Problem Overview

Implement a one-page iOS app (in Xcode, live coding) containing a UITableView with 50 rows. Each row displays a timer counter. Requirements: (1) When a cell scrolls into the visible viewport, its timer auto-starts and increments every 0.1 seconds. (2) When a cell scrolls out of the viewport, its timer…

  • 2 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
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Interviewer Follow-ups
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