UITableViewDelegate
Serving as a table's delegate means you provide answers to requests about the layout of the table and about actions the user performs on the tableview. Layout methods include the tableview asking about the height of rows, headers, and footers, what the buttons should look like, etc. Action methods include the user selecting a row and beginning and ending the editing of a row.
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UITableViewDatasource
Serving as a table's datasource means you provide data for the sections and rows of a table and you act on messages that change a table's data. The datasource is asked for the data for a cell when the table is drawn, is told that the user has asked to delete a row, and is told the new value of a row that the user has edited.
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
