�分类.PNG

先创建左边的tableView和右边的collectionView

UITableView *tableView = [[UITableView alloc]init];
    self.tableView = tableView;
    tableView.delegate = self;
    tableView.dataSource = self;
    tableView.backgroundColor = ControllerBgColor;
    tableView.frame = CGRectMake(0, 64, ScreenWidth / 4, ScreenHeight);
    tableView.showsVerticalScrollIndicator = NO;
    tableView.separatorStyle = UITableViewCellSelectionStyleNone;
    tableView.tableFooterView = [[UIView alloc]init];
    [self.view addSubview:tableView];
    [tableView registerNib:[UINib nibWithNibName:NSStringFromClass([CategoryCell class]) bundle:nil] forCellReuseIdentifier:@"CategoryCell"];
    
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc]init];
    layout.minimumLineSpacing = 0.5;
    layout.minimumInteritemSpacing = 0.5;
    CGFloat w = (ScreenWidth - ScreenWidth / 4) / 3 - 0.5;
    CGFloat h = 44;
    layout.itemSize = CGSizeMake(w, h);
    UICollectionView *collectionView = [[UICollectionView alloc]initWithFrame:CGRectZero collectionViewLayout:layout];
    collectionView.delegate = self;
    collectionView.dataSource = self;
    self.collectionView = collectionView;
    collectionView.frame = CGRectMake(tableView.frame.size.width, 64, (ScreenWidth - ScreenWidth / 4), ScreenHeight);
    collectionView.backgroundColor = ControllerBgColor;
    [collectionView registerClass:[UserCell class] forCellWithReuseIdentifier:@"UserCell"];
    [self.view addSubview:collectionView];

点击tableViewCell更新collectionView

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    CategoryModel_result *result = self.categoryModel.result[indexPath.row];
    self.collectionCellArray = result.children;
    [self.collectionView reloadData];
}

collectionView代理实现

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    if (self.collectionCellArray == 0) {
        CategoryModel_result *result = self.categoryModel.result[section];
        return result.children.count;
    } else {
        return self.collectionCellArray.count;
    }
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UserCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"UserCell" forIndexPath:indexPath];
    if (self.collectionCellArray == 0) {
        CategoryModel_result *result = self.categoryModel.result[indexPath.section];
        CategoryModel_result_children *children = result.children[indexPath.row];
        cell.label.text = children.name;
    } else {
        CategoryModel_result_children *children = self.collectionCellArray[indexPath.row];
        cell.label.text = children.name;
    }
    return cell;
}

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