UITableView Grouped mode is triggered when the slide content reload events, how to cancel?

Tested UITableView Grouped mode is triggered when the slide content reload events:

1 cellForRowAtIndexPath

2 titleForHeaderInSection

Resulting in duplication of data loading, how to cancel it?
Reply:
Try to write generic delegate in written, not restraint system events and system calls.
Reply:
You can write triggers NSLog try to slide longitudinally in titleForHeaderInSection when TableView
Reply:
The landlord does not seem to understand,
1 cellForRowAtIndexPath

2 titleForHeaderInSection

These two callbacks are systems based on specific events (such as the user scrolls the view) to the callback,
you needIs here to generate a specified view or title to, in accordance with the format generation to the system, do not worry.