Uitableview--datasource method

Based on the order of the prompts:

1. You must inherit the Uitableviewdatasource first, so that the controller (Viewcontroller =self) can use the DataSource method.

2. Make the Controller (self) a data source, and selfcan access all the methods of datasource

The order of the graphs is the order in which the controller accesses: 3---4---5

3. The controller is accessed only once and is divided into 2 groups (section);

4. Controller Access 2 times (with 3 related), the first time to section=0 divided 3 lines, the second time to section = 1 points 4 lines;

5. The Controller visited 7 times (with 4 related =3+4), each time displaying different contents according to the row row of section group

Uitableview--datasource method