[IPhone] [UITableView] How do I know when a group will completely replace another (scroll)?

Question

Please refer to the following image for details:

I think UITableView has some events that occur when scrolling them, when a group completely replaces another, but I do not know :(

Answer 1

You can get the drawing rectangle for each section using the method -rectForSection(see the section “Accessing the drawing area as a table” in UITableView documents). Then in your implementation of UITableViewDelegate you can track the scroll events in a table, for example. in the method, -scrollViewDidScroll:you can compare the current contentsOffsetand the starting point of the rectangle for each section to determine which section is currently active.