//*********** For A Special Time    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"];    [animation setDuration:0];    [animation setFromValue:[NSNumber numberWithFloat:1.0]];    [animation setToValue:[NSNumber numberWithFloat:0.0]];    [animation setBeginTime:5];    [animation setRemovedOnCompletion:NO];    [animation setFillMode:kCAFillModeForwards];    [overlayLayer addAnimation:animation forKey:@"animateOpacity"];