I look more deep in the documentation and I found This
- (void) configureSlideLayer:(CALayer *)layer
{
layer.shadowColor = [UIColor grayColor].CGColor;
// Change to 0
layer.shadowOpacity = 1;
layer.shadowOffset = CGSizeMake(0, 0);
layer.masksToBounds = NO;
layer.shadowPath =[UIBezierPath bezierPathWithRect:layer.bounds].CGPath;
}