strange gray area at bottom of tableview controller

Question

I can not understand why this tableview has gray area at the bottom of tableview.

I only embedded table view controller into navigation controller and I add a tab bar item.

If I remove navigation controller, that area will go away.

Answer 1

There are two possible causes here. Either 1) You do not have enough constraints to pin each edge of the tableview to the superview or 2) the table footer view is being displayed in that place, in which case set the tableview.tableFooterView = UIView() and implement heightForFooterInSection to return 0.