级联界面(推荐界面)搭建原理

  1 - (void)viewDidLoad {
  2     [super viewDidLoad];
  3  
  4     self.title = @"推荐关注";
  5     self.automaticallyAdjustsScrollViewInsets = NO;
  6     _categoryTableView.contentInset = UIEdgeInsetsMake(64, 0, 0, 0);
  7     _userTableView.contentInset = UIEdgeInsetsMake(64, 0, 0, 0);
  8     // 分类tableView注册cell
  9     [_categoryTableView registerNib:[UINib nibWithNibName:@"XMGCategoryCell" bundle:nil] forCellReuseIdentifier:categoryID];
 10     // 用户tableView注册cell
 11     [_userTableView registerNib:[UINib nibWithNibName:@"XMGSubTagCell" bundle:nil] forCellReuseIdentifier:userID];
 12     // 请求分类数据
 13     [self loadCategoryData];
 14     // 添加上下拉刷新
 15     [self setupRefreshView];  
 16 }
 17 - (void)setupRefreshView
 18 {
 19     // 下拉刷新
 20     // 当松手,并且下拉刷新完全显示的时候,就会触发下拉刷新
 21     MJRefreshNormalHeader *header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(loadNewUserData)];
 22     header.automaticallyChangeAlpha = YES;
 23     self.userTableView.mj_header = header;
 24    
 25     // 上拉刷新
 26     MJRefreshAutoNormalFooter *footer = [MJRefreshAutoNormalFooter footerWithRefreshingTarget:self refreshingAction:@selector(loadMoreUserData)];
 27     footer.automaticallyHidden = YES;
 28     self.userTableView.mj_footer = footer;
 29 }
 30  
 31 - (void)loadCategoryData
 32 {
 33     AFHTTPSessionManager *mgr = [AFHTTPSessionManager xmg_manager];
 34   
 35     NSMutableDictionary *parameters = [NSMutableDictionary dictionary];
 36     parameters[@"a"] = @"category";
 37     parameters[@"c"] = @"subscribe";
 38    
 39     [mgr GET:XMGBaseUrl parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary * _Nullable responseObject) {
 40         NSArray *dictArr = responseObject[@"list"];
 41        
 42         _categorys = [XMGCategoryItem mj_objectArrayWithKeyValuesArray:dictArr];
 43        
 44         [self.categoryTableView reloadData];
 45        
 46         // 默认选中第0个cell
 47         NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
 48         [self.categoryTableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionNone];
 49        
 50         [self tableView:self.categoryTableView didSelectRowAtIndexPath:indexPath];
 51        
 52     } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {  
 53     }];
 54 }
 55 
 56 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 57 {
 58     if (tableView == _categoryTableView) { // 显示分类TableView
 59         return _categorys.count;
 60     }
 61     return _selectCategoryItem.users.count;
 62 }
 63 
 64 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 65 {
 66     if (tableView == _categoryTableView) { // 显示分类TableView
 67         XMGCategoryCell *cell = [tableView dequeueReusableCellWithIdentifier:categoryID];
 68         cell.item = _categorys[indexPath.row];
 69         return cell;
 70     } 
 71      XMGSubTagCell *cell = [tableView dequeueReusableCellWithIdentifier:userID];
 72      cell.user =  _selectCategoryItem.users[indexPath.row];
 73     return cell;
 74 }
 75  
 76 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 77 {
 78     if (tableView == _categoryTableView) {
 79         return 44;
 80     }
 81     return 60 + 1;
 82 }
 83 // 点击cell就会调用
 84 // 必须用户手动点击cell才会触发
 85 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 86 {
 87     if (tableView == _categoryTableView) {
 88         // 记录选中分类模型
 89         _selectCategoryItem = _categorys[indexPath.row];
 90         // 点击分类cell
 91         // 判断之前有没有数据
 92         if (_selectCategoryItem.users.count) {
 93             [self.userTableView reloadData];
 94             self.userTableView.mj_footer.hidden = _selectCategoryItem.page > _selectCategoryItem.total_page;    
 95             return;
 96         }
 97         // 请求右边用户数据
 98         [self loadNewUserData];     
 99     }   
100 }
101 
102 // 没有更多数据的时候,隐藏上拉刷新控件
103 // 判断当前分类用户组 有没有更多用户组
104 // 加载更多用户数据
105 - (void)loadMoreUserData
106 {
107     [self.mgr.tasks makeObjectsPerformSelector:@selector(cancel)];
108    
109     NSMutableDictionary *parameters = [NSMutableDictionary dictionary];
110     parameters[@"a"] = @"list";
111     parameters[@"c"] = @"subscribe";
112     parameters[@"category_id"] = _selectCategoryItem.id;
113     parameters[@"page"] = @(_selectCategoryItem.page);
114    
115     [self.mgr GET:XMGBaseUrl parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary * _Nullable responseObject) {
116        
117         [self.userTableView.mj_footer endRefreshing];
118        
119         _selectCategoryItem.page++;
120         NSArray *dictArr = responseObject[@"list"];
121        
122         NSArray *users = [XMGUserItem mj_objectArrayWithKeyValuesArray:dictArr];
123        
124         // 取出数组中所有元素,添加到新数组
125 //        [_selectCategoryItem.users addObject:users];
126         [_selectCategoryItem.users addObjectsFromArray:users];
127        
128         [self.userTableView reloadData];
129        
130         // 控制上拉控件是否显示,一定要在reloadData之后
131         self.userTableView.mj_footer.hidden = _selectCategoryItem.page > _selectCategoryItem.total_page;
132     } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {    
133     }];
134 }
135 
136 // 加载更新用户数据
137 - (void)loadNewUserData
138 {
139     _selectCategoryItem.page = 1;
140     [self.mgr.tasks makeObjectsPerformSelector:@selector(cancel)];
141    
142     NSMutableDictionary *parameters = [NSMutableDictionary dictionary];
143     parameters[@"a"] = @"list";
144     parameters[@"c"] = @"subscribe";
145     parameters[@"category_id"] = _selectCategoryItem.id;
146    
147     [self.mgr GET:XMGBaseUrl parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary * _Nullable responseObject) {
148        
149         _selectCategoryItem.page++;
150        
151         // 记录当前分类总页码数
152         _selectCategoryItem.total_page = [responseObject[@"total_page"] integerValue];
153        
154         // 结束刷新
155         [self.userTableView.mj_header endRefreshing];
156        
157         NSArray *dictArr = responseObject[@"list"];
158        
159         _selectCategoryItem.users = [XMGUserItem mj_objectArrayWithKeyValuesArray:dictArr];
160        
161         [self.userTableView reloadData];
162        
163         self.userTableView.mj_footer.hidden = _selectCategoryItem.page > _selectCategoryItem.total_page;
164   
165     } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {      
166     }];
167 }