iPhone: 检查用户最后一次触摸屏幕的时间(2)

     }

     else {

         if(fabs([idleTimer.fireDate timeIntervalSinceNow]) < kMaxIdleTimeSeconds-1.0){

            [idleTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:kMaxIdleTimeSeconds]];

         }

     }

 } 

- (void)idleTimerExceeded {

     [idleTimerrelease];

 idleTimer = nil;

     [selfstartScreenSaverOrSomethingInteresting];

     [selfresetIdleTimer];

} 

- (UIResponder *)nextResponder {

     [selfresetIdleTimer];

     return[super nextResponder];

} 

- (void)viewDidLoad {

     [superviewDidLoad];

     [selfresetIdleTimer];

} 

@end

为简便起见，忽略了内存管理代码。