iPhone: Detecting user inactivity/idle time since last screen touch

Question

Has anybody implemented a feature where if the user has not touched the screen for a certain time period, you take a certain action? I\'m trying to figure out the best way t

Answer 1

Here is another way to detect activity:

The timer is added in UITrackingRunLoopMode, so it can only fire if there is UITracking activity. It also has the nice advantage of not spamming you for all touch events, thus informing if there was activity in the last ACTIVITY_DETECT_TIMER_RESOLUTION seconds. I named the selector keepAlive as it seems an appropriate use case for this. You can of course do whatever you desire with the information that there was activity recently.

_touchesTimer = [NSTimer timerWithTimeInterval:ACTIVITY_DETECT_TIMER_RESOLUTION
                                        target:self
                                      selector:@selector(keepAlive)
                                      userInfo:nil
                                       repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:_touchesTimer forMode:UITrackingRunLoopMode];