How to Determine Visibility of a View Controller

Alex talks about unexpected intricacies and complexities he encountered trying to determine if a given view controller is visible trying to refresh data every time the user sees it. This seems like an overkill but it is more complex then you'd expect.Table of states and viewDidAppear/Foreground notification calls: https://1drv.ms/u/s!AneU_VTSiGUEh2kmJVH376QmUG79?e=X13rSQSign up for Alex's upcoming video course about iOS System Design Interview: https://iosinterviewguide.com/system-design-interviewSign up for Alex's upcoming video course about RIBs Architecture: http://ribsarchitecture.com/video-course-waitlistNeed to prepare for an iOS Engineer Interview?https://iosinterviewguide.comConnect with us: https://twitter.com/insideiosdevEmail us at hello@insideiosdev.com