how to hide empty rows in a UITableView and change the height of the Uitableview based on non-empty rows

Question

I have couple of problems with my UITableView.

1. When I add a UITableview on my page, by default it brings up some fixed number of rows,

Answer 1

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section 
 { 
     return 0.01f;
 }

and for iOS 7

 self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];