177     [[NSNotificationCenter defaultCenter] addObserver:self

   177     [[NSNotificationCenter defaultCenter] addObserver:self

   178                                              selector:@selector(cleanup)

   178                                              selector:@selector(cleanup)

   179                                                  name:@"remove overlay"

   179                                                  name:@"remove overlay"

   180                                                object:nil];

   180                                                object:nil];

   181 

   181 

   183     if ([UIScreen respondsToSelector:@selector(screens)]) {

   183     if ([UIScreen respondsToSelector:@selector(screens)]) {

   184         [[NSNotificationCenter defaultCenter] addObserver:self

   184         [[NSNotificationCenter defaultCenter] addObserver:self

   185                                                  selector:@selector(numberOfScreensIncreased)

   185                                                  selector:@selector(numberOfScreensIncreased)

   186                                                      name:UIScreenDidConnectNotification

   186                                                      name:UIScreenDidConnectNotification

   187                                                    object:nil];

   187                                                    object:nil];

   192                                                    object:nil];

   192                                                    object:nil];

   193     }

   193     }

   194 

   194 

   195     // present the overlay

   195     // present the overlay

   196     [UIView beginAnimations:@"showing overlay" context:NULL];

   196     [UIView beginAnimations:@"showing overlay" context:NULL];

   198     self.view.alpha = 1;

   198     self.view.alpha = 1;

   199     [UIView commitAnimations];

   199     [UIView commitAnimations];

   200 }

   200 }

   201 

   201 

   202 -(void) numberOfScreensIncreased {

   202 -(void) numberOfScreensIncreased {

   260     [super didReceiveMemoryWarning];

   260     [super didReceiveMemoryWarning];

   261 }

   261 }

   262 

   262 

   263 -(void) viewDidUnload {

   263 -(void) viewDidUnload {

   264     // only objects initialized in viewDidLoad should be here

   264     // only objects initialized in viewDidLoad should be here

   265     [[NSNotificationCenter defaultCenter] removeObserver:self];

   267     [[NSNotificationCenter defaultCenter] removeObserver:self];

   266     [NSObject cancelPreviousPerformRequestsWithTarget:self

   268     [NSObject cancelPreviousPerformRequestsWithTarget:self

   267                                              selector:@selector(unsetPreciseStatus)

   269                                              selector:@selector(unsetPreciseStatus)

   268                                                object:nil];

   270                                                object:nil];

   269     dimTimer = nil;

   271     dimTimer = nil;