UITableView has no scrolling

I have a UIViewController which uses the UITableViewDelegate and UITableViewDataSource. I have created UITableView with about 20 custom UITableViewCells and not all those UITableViewCells fit on the screen. Naturally you would think that it is possib开发者_如何学Cle to scroll to the bottom and see the other UITableViewCells but it doesn't detect the scrolling at all so I can't see the bottom items.

My AppDelegate has a UINavigationController and I just added it with

[window addSubview:navigationController.view]

The View Controller inside the Navigation Controller implements a

@interface MainViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>

All I am simply doing is creating a UINavigationController application so by default the UITableView properties should be the default ones.

My MainViewController XIB has

• View
  • Table View
  • Table View Cell
  • Table View Cell
  • Table View Cell
  • another 15 Table View Cell

From the above I'm not sure how I've modified the default UITableView as I have not configured it in any way.

The UITableView renders as I want it to, but when I want to see the bottom UITableViewCells it just doesn't scroll at all.

My checklist in this case:

• is tableview scrollEnabled == YES?
• tableView.contentSize.width != tableView.bounds.size.width && tableView.contentSize.height != tableView.bounds.size.height;
• interface orientation is correct?
• There aren't any invisibe UIView or subclass over the tableview.