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

Override the view's touches began method and reset a timer when you get touches.

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.timer invalidate];
    self.timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(inactivityTimerFired) userInfo:nil repeats:NO];

    [super touchesBegan:touches withEvent:event];
}

You could target the view controller instead of self if you need to.