Table View Cells in iOS8

In iOS8 `UITableViewCells` don't have a default size. This is because they use the auto layout constraints to calculate the height. If you use func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat to define the height, you are fine.

Therefore, if you can't see any cells in your table view after compiling for iOS8, you maybe have to add a height constraint to your table view or implement func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat.