Not scrolling down when tableview exceeds main screen

I have a tableview having lots of datarows inside it. When I integrate the tableview with more datarows which can be seen while tableview is scrolled downwards, I can't scroll down when the widget is integrated. So, I can't see other items in tableview. If I take fixed height of Tableview then it works but I don't want to take fixed height. Any help will be appreciated.