Assigning a Data Source
UITableView instances rely on an external source to feed either new or existing table cells on demand. Cells are small views that populate the table, adding row-based content. This external source is called a data source and refers to the object whose responsibility it is to return a cell on request to a table.
The table’s dataSource property sets an object to act as a table’s source of cells and other layout information. That object declares and must implement the UITableViewDataSource protocol. In addition to returning cells, a table’s data source specifies the number of sections in the table, the number of cells per section, any titles associated with the sections, cell heights, an optional table of contents, and more. ...
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