How to center the cells in a table view controller on iOS 7 (like Settings.app on iPad)

CenteredTableView.m

- (void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    // See: http://stackoverflow.com/a/18833311/9849
    if (self.displayAsCenteredTableView) {
        if (tableView == self.tableView) {
            CGFloat cornerRadius = 7.f;
            cell.backgroundColor = UIColor.clearColor;
            CAShapeLayer *fillLayer = [[CAShapeLayer alloc] init];
            CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
            CGMutablePathRef pathRef = CGPathCreateMutable();
            CGRect bounds = CGRectInset(cell.bounds, 0, 0);
            BOOL addLine = NO;
            if (indexPath.row == 0 && indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
                CGPathAddRoundedRect(pathRef, nil, bounds, cornerRadius, cornerRadius);
            } else if (indexPath.row == 0) {
                CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
                CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
                CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
                CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds));
                addLine = YES;
            } else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
                CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds));
                CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);
                CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
                CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds));
            } else {
                CGPathAddRect(pathRef, nil, bounds);
                addLine = YES;
            }
            fillLayer.path = pathRef;
            CGPathRef pathCopyRef = CGPathCreateCopy(pathRef);
            maskLayer.path = pathCopyRef;
            CFRelease(pathRef);
            CFRelease(pathCopyRef);
            fillLayer.fillColor = [UIColor colorWithWhite:1.f alpha:0.8f].CGColor;

            if (addLine == YES) {
                CALayer *lineLayer = [[CALayer alloc] init];
                CGFloat lineHeight = (1.f / [UIScreen mainScreen].scale);
                lineLayer.frame = CGRectMake(CGRectGetMinX(bounds)+10, bounds.size.height-lineHeight, bounds.size.width-10, lineHeight);
                lineLayer.backgroundColor = tableView.separatorColor.CGColor;
                [fillLayer addSublayer:lineLayer];
            }

            UIView *testView = [[UIView alloc] initWithFrame:bounds];
            [testView.layer insertSublayer:fillLayer atIndex:0];
            testView.backgroundColor = UIColor.clearColor;
            cell.backgroundView = testView;
            cell.layer.mask = maskLayer;
        }
    } else {
        cell.backgroundColor = [UIColor whiteColor];
    }

}