How can I create a transparent tableview with each cells being transparent?

Question

I tried all this inside

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
1.tableView.backgroundColor = [UIColor clearColor];
2.cell.backgroundColor = [UIColor clearColor];
3.cell.contentView.backgroundColor = [UIColor clearColor];

It only responds to the 1st line and makes the background a translucent kind of black. What should I do to get 100% transparency?