ios - Clicking on the index bar on the right side of UITableView cannot jump automatically. How can I solve this problem?

Question

As shown below, when I click on any letter from A-Z, it cannot jump,

also implements the following methods:

• (NSArray )sectionIndexTitlesForTableView:(UITableView )tableView
  ／{

／ return self.sectionTitles;
／}
Could you please tell me how to solve this problem?

Answer 1

The method to click on the index bar is this:

-(NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index