如何将Table View Controller与多个子类别一起使用 [英] How to use Table View Controller with multiple sub categories

问题描述

我有一个UITableView，我想添加几个类别.

I have a UITableView with and I want to add several categories.

我的数据看起来像这样:

My data looks somewhat like this:

• 主要类别A
  • 子类别红色
    • SubSubCategory X
      • SubSubSubCategory
      • MainCategory A
        • SubCategory Red
          • SubSubCategory X
            • SubSubSubCategory
            • 子类别红色
              • SubSubCategory X
              • SubSubCategory Y
              • SubCategory Red
                • SubSubCategory X
                • SubSubCategory Y
                • SubSubCategory X

                第一个屏幕应该显示所有MainCategories，然后如果我单击A，它应该显示SubCategory红色和蓝色，依此类推...

                The first screen should show all the MainCategories, then if I click on A, it should show me SubCategory Red and Blue, and so on...

                我到处搜索，但找不到解决方案.

                I searched everywhere but couldn't find a solution.

                我应该如何构造我的数据，这样才能正常工作? cellForRowAt仅使您可以选择提供第一组子类别的数据.我将其余的数据放在哪里?

                How should I structure my data so that this would work? cellForRowAt only gives you the option to give the data for the first set of sub categories. Where do I put the data for the rest?

                推荐答案

                创建带有标题和Menu对象数组的结构菜单.

                Create a struct Menu with a title and an array of Menu objects.

                struct Menu {
                    var title: String
                    var subMenus: [Menu]?
                }
                

                在要启动菜单的视图控制器中添加菜单详细信息.并使用菜单对象推送UITableViewController.如果按下了子菜单，则按UITableViewController和子菜单对象.

                Add menu detail in a view controller where you want to start the menu. And push a UITableViewController with the menu object. If a submenu is pressed push a UITableViewController with the sub menu object.

                //ViewController.swift

                //ViewController.swift

                class ViewController: UIViewController {
                
                    override func viewDidLoad() {
                        super.viewDidLoad()
                
                    }
                    @IBAction func startMenuAction(_ sender: UIButton) {
                        let red1 = Menu(title: "SubCategory Red", subMenus: [Menu(title: "SubSubCategory X", subMenus: [Menu(title: "SubSubSubCategory", subMenus: nil)]),
                                                                             Menu(title: "SubSubCategory Y", subMenus: nil)])
                        let blue1 = Menu(title: "SubCategory Blue", subMenus: nil)
                
                        let red2 = Menu(title: "SubCategory Red", subMenus: [Menu(title: "SubSubCategory X", subMenus: nil),
                                                                             Menu(title: "SubSubCategory Y", subMenus: nil)])
                        let blue2 = Menu(title: "SubCategory Blue", subMenus: [Menu(title: "SubSubCategory X", subMenus: nil)])
                        let green2 = Menu(title: "SubCategory Green", subMenus: nil)
                
                        let categories = [Menu(title: "MainCategory A", subMenus: [red1, blue1]), Menu(title: "MainCategory B", subMenus: [red2, blue2, green2])]
                
                        let mainMenu:Menu = Menu(title: "My Menu", subMenus: categories)
                
                        let menuVC = MenuVC()
                        menuVC.currentMenu = mainMenu
                        self.navigationController?.pushViewController(menuVC, animated: true)
                    }
                }
                

                //MenuVC.swift

                //MenuVC.swift

                class MenuVC: UITableViewController {
                    var currentMenu: Menu?
                    override func viewDidLoad() {
                        super.viewDidLoad()
                        view.backgroundColor = .white
                        title = currentMenu?.title
                    }
                
                    // MARK: - Table view data source
                    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
                        return (currentMenu?.subMenus?.count ?? 0)
                    }
                
                    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
                        let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier") ?? UITableViewCell(style: .default, reuseIdentifier: "reuseIdentifier")
                        if currentMenu?.subMenus?[indexPath.row].subMenus?.isEmpty ?? true {
                            cell.accessoryType = .none
                        } else {
                            cell.accessoryType = .disclosureIndicator
                        }
                        cell.textLabel?.text = currentMenu?.subMenus?[indexPath.row].title
                        return cell
                    }
                    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
                        if !(currentMenu?.subMenus?[indexPath.row].subMenus?.isEmpty ?? true) {
                            let menuVC = MenuVC()
                            menuVC.currentMenu = currentMenu?.subMenus?[indexPath.row]
                            self.navigationController?.pushViewController(menuVC, animated: true)
                        } 
                    }
                }
                

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