How to inform a Model/TableView that some data changed?

[MorrisLiang]

Check the QAbstractItemModel docs.

#1 You can just emit layoutAboutToBeChanged() and layoutChanged().The view will then update itself thoroughly.
#2 If you are inserting/removing/moving items.Check the protected function.
example:

void MyModel::removeOneRow(int index)
{
   beginRemoveRows(xx);
   ...//Do the remove action here.
   endRemoveRows(xx);
}

void MyModel::removeOneRow(int index)
{
   beginRemoveRows(xx);
   ...//Do the remove action here.
   endRemoveRows(xx);
}

To copy to clipboard, switch view to plain text mode 

After calling this function,the view will also update itself.
#3 If you want to update a range of item.Check the dataChanged(xxx) signal.