iOS Programming: The Big Nerd Ranch Guide

Moving Rows

To change the order of rows in a UITableView, you will use another method from the UITableViewDataSource protocol – tableView(_:moveRowAtIndexPath:toIndexPath:).

To delete a row, you had to call the method deleteRowsAtIndexPaths(_:withRowAnimation:) on the UITableView to confirm the deletion. Moving a row, however, does not require confirmation: The table view moves the row on its own authority and reports the move to its data source by calling the method tableView(_:moveRowAtIndexPath:toIndexPath:). You implement this method to update your data source to match the new order.

But before you can implement this method, you need to give the ItemStore a method to change the order of items in its allItems array.

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