1
- (void)press:(UIButton *)btn {
2
    [self.foldTableView mas_updateConstraints:^(MASConstraintMaker *make) {
3
        if (btn.selected) {
4
            make.height.mas_equalTo(30);
5
        } else {
6
            make.height.mas_equalTo(150);
7
        }
8
    }];
9
    btn.selected = !btn.selected;
10
}

1
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
2
    NSString *str = self.array[indexPath.section];
3
    [self.array removeObjectAtIndex:indexPath.section];
4
    [self.array insertObject:str atIndex:0];
5
    [self.foldTableView reloadData];
6
    [self press:self.btn];
7
}