I want to enable Timer only when user is logged in - ios

Question

I want to enable Timer only when user is logged in. How to go about this? I tried but getting session time out message even when user is on login screen.
#import "TIMERUIApplication.h"
#implementation TIMERUIApplication
//here we are listening for any touch. If the screen receives touch, the timer is reset
-(void)sendEvent:(UIEvent *)event
{
[super sendEvent:event];
if (!myidleTimer)
{
[self resetIdleTimer];
}
NSSet *allTouches = [event allTouches];
if ([allTouches count] > 0)
{
UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
if (phase == UITouchPhaseBegan)
{
[self resetIdleTimer];
}
}
}
-(void)resetIdleTimer
{
if (myidleTimer)
{
[myidleTimer invalidate];
}
//convert the wait period into minutes rather than seconds
int timeout = kApplicationTimeoutInMinutes * 60;
myidleTimer = [NSTimer scheduledTimerWithTimeInterval:timeout target:self
selector:#selector(idleTimerExceeded) userInfo:nil repeats:NO];
}
//if the timer reaches the limit as defined in kApplicationTimeoutInMinutes, post this notification
-(void)idleTimerExceeded {
[[NSNotificationCenter defaultCenter]
postNotificationName:kApplicationDidTimeoutNotification object:nil];
}
and
-(void)applicationDidTimeout:(NSNotification *) notif {
NSLog (#"time exceeded!!");
UIViewController *controller = [[UIStoryboard
storyboardWithName:#"MainStoryboard" bundle:NULL]
instantiateViewControllerWithIdentifier:#"mainView"];
//I've tried a few varieties of the if statement to no avail. Always goes to else.
if ([controller isViewLoaded]) {
NSLog(#"Already there!");
}
else {
NSLog(#"go home");
[(UINavigationController *)self.window.rootViewController pushViewController:controller animated:YES];
//[(TIMERUIApplication *)[UIApplication sharedApplication] resetIdleTimer];
}
}