iOS-UITableView使用reloadSections刷新section问题

[famousTangTable reloadSections:[[NSIndexSet alloc] initWithIndex:Secons] withRowAnimation:UITableViewRowAnimationAutomatic];

[CATransaction begin];
 [CATransaction setCompletionBlock:^{
      [famousTangTable reloadData];
 }];
 <span style="font-family: Arial, Helvetica, sans-serif;">[famousTangTable reloadSections:[[NSIndexSet alloc] initWithIndex:2] withRowAnimation:UITableViewRowAnimationAutomatic];</span>
 [CATransaction commit];