UITableView刷新一行、一个区

//一个section刷新    
NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:2];    
[tableview reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];    
//一个cell刷新    
NSIndexPath *indexPath=[NSIndexPath indexPathForRow:3 inSection:0];    
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone];
// 加入一行cell
[_timeBucketArrayM addObject:@"cc"];
[self.tableView insertRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:_timeBucketArrayM.count - 1 inSection:0]] withRowAnimation:UITableViewRowAnimationFade];