How to detect user inactivity since last touch on a particular viewcontroller in iOS?

Question

I need to perform a particular action in a view controller when user don\'t touch a particular screen for 3 seconds.

How can I do that in iOS?

Answer 1

1. Add an NSTimer property/ivar to your view controller
2. Add a tap gesture recognizer to the view you want to monitor (or use touchesBegan:)
3. When the tap recognizer is hit, start the timer with an interval of 3.0s to call a function
4. If tap recognizer is hit before the function the timer calls, invalidate the timer and set it to nil
5. If the function that the timer was calling is hit, the user has been inactive for 3 seconds