En ios7 tableView: didSelectRowAtIndexPath: no se llama

I meagrate my project to adjust ios7 while I encountered a strange problem : the delegate method "tableView:didSelectRowAtIndexPath:" is not called in ios7 ,it works well in prior ios version.I was wonder if some specific property be changed in ios7 Here is the code:

- (void)viewDidLoad {
    [super viewDidLoad];

    [self.tableView setDelegate:self];
    [self.tableView setDataSource:self];
    [self.tableView setAllowsMultipleSelection:NO];
    [self.tableView setMultipleTouchEnabled:NO];

}

- (void)tableView:(UITableView *)sender didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    [sender deselectRowAtIndexPath:indexPath animated:YES];

    _currentContact = [contactArr objectAtIndex:indexPath.row];
    if ([_currentContact.accountNPC hasPrefix:@"0"]) {
        isContactToNPC = NO;
    }else{
        isContactToNPC = YES;
    }

    ....
}