Detecting user inactivity/idle time since last touch on screen

If you required to find inactivity of screen in one of my iPad project.  Here is the steps by which I completed this task.

Step 1 -  Add a class (IdleTimeCheck) in your project which subclass UIApplication. In the implementation file, override the sendEvent: method like so:

- (void)sendEvent:(UIEvent *)event {
[super sendEvent:event];

// Only want to reset the timer on a Began touch or an Ended touch, to reduce the number of timer resets.
NSSet *allTouches = [event allTouches];
if ([allTouches count] > 0) {
// allTouches count only ever seems to be 1, so anyObject works here.
UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
if (phase == UITouchPhaseBegan || phase == UITouchPhaseEnded)
[self resetIdleTimer];
}
}

- (void)resetIdleTimer {
if (idleTimer) {
[idleTimer invalidate];
[idleTimer release];
}

idleTimer = [[NSTimer scheduledTimerWithTimeInterval:maxIdleTime target:self selector:@selector(idleTimerExceeded) userInfo:nil repeats:NO] retain];
}

- (void)idleTimerExceeded {
NSLog(@"idle time exceeded");
}

where maxIdleTime and idleTimer are instance variables.

Step 2 – Modify your UIApplicationMain function in main.m file to use your UIApplication subclass class as principal class.

int retVal = UIApplicationMain(argc, argv, @"IdleTimeCheck",nil);

And its done.

I guess you came to this post by searching similar kind of issues in any of the search engine and hope that this resolved your problem. If you find this tips useful, just drop a line below and share the link to others and who knows they might find it useful too.

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