CALayer shadow while scrolling UITableView - objective-c

Question

I have added a shadow to a UITableView (which covers a third of the screen sfrom the bottom - see attached screenshot) using the following in a UIView Category:
- (void) addShadow {
UIBezierPath *path = [UIBezierPath bezierPathWithRect:self.bounds];
self.layer.masksToBounds = NO;
self.layer.shadowColor = [UIColor blackColor].CGColor;
self.layer.shadowOpacity = 1;
self.layer.shadowOffset = CGSizeMake(-5,-5);
self.layer.shadowRadius = 20;
self.layer.shadowPath = path.CGPath;
self.layer.shouldRasterize = YES;
}
It appears as expected, but when I scroll it up, the shadow scrolls up too. Also, the table scrolls beyond its upper bound. Can you suggest what is wrong here? if I comment self.layer.masksToBounds = NO;, the shadow disappears, but the table scrolling is as expected. Hence, the problem lies somewhere around masksToBounds perhaps.

Answer 1

I solved it by putting an identical view underneath, just for the shadow. Not a clean solution ... hence I am still open to answers. My code is as follows:
- (UIView*) addShadow {
UIView* backView = [[UIView alloc] initWithFrame:self.frame];
UIBezierPath *path = [UIBezierPath bezierPathWithRect:backView.bounds];
backView.layer.masksToBounds = NO;
backView.layer.shadowColor = [UIColor blackColor].CGColor;
backView.layer.shadowOpacity = 1;
backView.layer.shadowOffset = CGSizeMake(-5,-5);
backView.layer.shadowRadius = 20;
backView.layer.shadowPath = path.CGPath;
backView.layer.shouldRasterize = YES;
[self.superview addSubview:backView];
[self.superview bringSubviewToFront:self];
return backView;
}
(void) removeShadow {
self.layer.masksToBounds = YES;
self.layer.shadowColor = nil;
self.layer.shadowOpacity = 0;
self.layer.shadowOffset = CGSizeMake(0,0);
self.layer.shadowRadius = 0;
}