true를 리턴해야 셀을 이동시킬 수 있음

tableView(_:canMoveRowAt:)

Asks the data source whether a given row can be moved to another location in the table view.

Declaration

optional func tableView(_ tableView: UITableView, 
           canMoveRowAt indexPath: IndexPath) -> Bool

Parameters

tableView

The table-view object requesting this information.

indexPath

An index path locating a row in tableView.

Return Value

true if the row can be moved; otherwise false.

Discussion

This method allows the data source to specify that the reordering control for the specified row not be shown. By default, the reordering control is shown if the data source implements the tableView(_:moveRowAt:to:) method.