UITableView anchor rows to bottom

I have a UITableView that needs to introduce new content from the bottom. This is how a table view behaves when the view is full and you add new rows with animation.

I was starting it by altering the contentInset as rows are introduced but then when they change things go off, and the entry animation is all wrong... My problem with this approach is compounded by the fact that users can delete rows, and the row contents update, causing them to resize (each row has it's own height which changes).

Any recommendations on how to get a UITableView rows to always appear at the bottom of the UITableView's view space?