iOS开发之级联界面(推荐界面)搭建原理

// 调用时刻:当一个cell选中的时候就会调用,并且一个cell取消选中的时候也会调用 - (void)setSelected:(BOOL)selected animated:(BOOL)animated 

[self.categoryTableView reloadData]; // 默认选中第0个cellNSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];[self.categoryTableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionNone]; 

- (void)viewDidLoad { [super viewDidLoad];  self.title = @"推荐关注"; self.automaticallyAdjustsScrollViewInsets = NO; _categoryTableView.contentInset = UIEdgeInsetsMake(64, 0, 0, 0); _userTableView.contentInset = UIEdgeInsetsMake(64, 0, 0, 0); // 分类tableView注册cell [_categoryTableView registerNib:[UINib nibWithNibName:@"XMGCategoryCell" bundle:nil] forCellReuseIdentifier:categoryID]; // 用户tableView注册cell [_userTableView registerNib:[UINib nibWithNibName:@"XMGSubTagCell" bundle:nil] forCellReuseIdentifier:userID]; // 请求分类数据 [self loadCategoryData]; // 添加上下拉刷新 [self setupRefreshView]; }- (void)setupRefreshView{ // 下拉刷新 // 当松手,并且下拉刷新完全显示的时候,就会触发下拉刷新 MJRefreshNormalHeader *header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(loadNewUserData)]; header.automaticallyChangeAlpha = YES; self.userTableView.mj_header = header;  // 上拉刷新 MJRefreshAutoNormalFooter *footer = [MJRefreshAutoNormalFooter footerWithRefreshingTarget:self refreshingAction:@selector(loadMoreUserData)]; footer.automaticallyHidden = YES; self.userTableView.mj_footer = footer;} - (void)loadCategoryData{ AFHTTPSessionManager *mgr = [AFHTTPSessionManager xmg_manager];  NSMutableDictionary *parameters = [NSMutableDictionary dictionary]; parameters[@"a"] = @"category"; parameters[@"c"] = @"subscribe";  [mgr GET:XMGBaseUrl parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary * _Nullable responseObject) { NSArray *dictArr = responseObject[@"list"];  _categorys = [XMGCategoryItem mj_objectArrayWithKeyValuesArray:dictArr];  [self.categoryTableView reloadData];  // 默认选中第0个cell NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0]; [self.categoryTableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionNone];  [self tableView:self.categoryTableView didSelectRowAtIndexPath:indexPath];  } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {  }];}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ if (tableView == _categoryTableView) { // 显示分类TableView return _categorys.count; } return _selectCategoryItem.users.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ if (tableView == _categoryTableView) { // 显示分类TableView XMGCategoryCell *cell = [tableView dequeueReusableCellWithIdentifier:categoryID]; cell.item = _categorys[indexPath.row]; return cell; }  XMGSubTagCell *cell = [tableView dequeueReusableCellWithIdentifier:userID]; cell.user = _selectCategoryItem.users[indexPath.row]; return cell;} - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ if (tableView == _categoryTableView) { return 44; } return 60 + 1;}// 点击cell就会调用// 必须用户手动点击cell才会触发- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ if (tableView == _categoryTableView) { // 记录选中分类模型 _selectCategoryItem = _categorys[indexPath.row]; // 点击分类cell // 判断之前有没有数据 if (_selectCategoryItem.users.count) {  [self.userTableView reloadData];  self.userTableView.mj_footer.hidden = _selectCategoryItem.page > _selectCategoryItem.total_page;   return; } // 请求右边用户数据 [self loadNewUserData];  } }// 没有更多数据的时候,隐藏上拉刷新控件// 判断当前分类用户组 有没有更多用户组// 加载更多用户数据- (void)loadMoreUserData{ [self.mgr.tasks makeObjectsPerformSelector:@selector(cancel)];  NSMutableDictionary *parameters = [NSMutableDictionary dictionary]; parameters[@"a"] = @"list"; parameters[@"c"] = @"subscribe"; parameters[@"category_id"] = _selectCategoryItem.id; parameters[@"page"] = @(_selectCategoryItem.page);  [self.mgr GET:XMGBaseUrl parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary * _Nullable responseObject) {  [self.userTableView.mj_footer endRefreshing];  _selectCategoryItem.page++; NSArray *dictArr = responseObject[@"list"];  NSArray *users = [XMGUserItem mj_objectArrayWithKeyValuesArray:dictArr];  // 取出数组中所有元素,添加到新数组// [_selectCategoryItem.users addObject:users]; [_selectCategoryItem.users addObjectsFromArray:users];  [self.userTableView reloadData];  // 控制上拉控件是否显示,一定要在reloadData之后 self.userTableView.mj_footer.hidden = _selectCategoryItem.page > _selectCategoryItem.total_page; } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {  }];}// 加载更新用户数据- (void)loadNewUserData{ _selectCategoryItem.page = 1; [self.mgr.tasks makeObjectsPerformSelector:@selector(cancel)];  NSMutableDictionary *parameters = [NSMutableDictionary dictionary]; parameters[@"a"] = @"list"; parameters[@"c"] = @"subscribe"; parameters[@"category_id"] = _selectCategoryItem.id;  [self.mgr GET:XMGBaseUrl parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary * _Nullable responseObject) {  _selectCategoryItem.page++;  // 记录当前分类总页码数 _selectCategoryItem.total_page = [responseObject[@"total_page"] integerValue];  // 结束刷新 [self.userTableView.mj_header endRefreshing];  NSArray *dictArr = responseObject[@"list"];  _selectCategoryItem.users = [XMGUserItem mj_objectArrayWithKeyValuesArray:dictArr];  [self.userTableView reloadData];  self.userTableView.mj_footer.hidden = _selectCategoryItem.page > _selectCategoryItem.total_page;  } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {  }];}