ios - 从单独的类输出二维数组中的元素

Question

我需要将一个类的二维数组中的第二个元素输出到 TableViewController。我尝试了一些方法，例如 data.reduce into:，但没有成功。 FirstViewController 应该填充三种类型“ Action 、悬疑和浪漫”，然后可以单击以显示属于该类型的所有电影。

头等舱:

     import Foundation

        protocol MovieModelDelegate: class {
           func didRecieveDataUpdate(data: [[String]])
        }

        class MovieModel {

           weak var delegate: MovieModelDelegate?

           var genreArray: [String] = []
           let data: [[String]] = [
              ["Avatar", "Action"],
              ["Limitless", "Suspense"],
              ["Die Hard", "Action"],
              ["The Avengers", "Action"],
              ["The Notebook", "Romance"],
              ["Lakehouse", "Romance"],
              ["Gone Girl", "Suspense"],
              ["Deadpool", "Action"],
              ["Passengers", "Suspense"],
              ["Inception", "Suspense"],
              ["Mission Impossible", "Action"]
         ]

          func requestData() {
             let movie: [[String]] = data
             delegate?.didRecieveDataUpdate(data: movie)
          }
       }


**TableView Class:**


    class FirstTableView: UITableViewController, MovieModelDelegate {

       var model = MovieModel()
       var selectedGenre: String = ""

       override func viewDidLoad() {
          super.viewDidLoad()
          model.delegate = self
          model.requestData()
       }

       override func numberOfSections(in tableView: UITableView) -> Int {
          return 1
       }

       override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
          return model.genreArray.count
       }

       override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
          let cell = tableView.dequeueReusableCell(withIdentifier: "GenreCells", for: indexPath) as! TableViewCell
          cell.genreLabel?.text = model.genreArray[indexPath.item]
          return cell
       }

       override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
          selectedGenre = model.data[indexPath.row]
          selectedGenre = ""
          for indexPath in model.data{
              if indexPath[1] == selectedGenre{
                  selectedGenre.append(indexPath[0])
              }
          }
      }

      override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
          if (segue.identifier == "pushToMovies") {
              if let VC = segue.destination as? FilteredSelection {
                  VC.selectedMovies = [selectedGenre]
              }
          }
      }

      func didRecieveDataUpdate(data: [[String]]) {
      }

      deinit{
      }
  }

Answer 1

您需要将数据更改为可以由 TableView 索引的形式。我将使用以下代码将其更改为字典。

let genreDictionary = data.reduce(into: [:]) { d, element in
    d[element[1], default: []].append(element[0])
}

这将创建以下字典

["Suspense": ["Limitless", "Gone Girl", "Passengers", "Inception"], 
 "Romance": ["The Notebook", "Lakehouse"], 
 "Action": ["Avatar", "Die Hard", "The Avengers", "Deadpool", "Mission Impossible"]]

然后在您的表格 View 函数中使用字典，如下所示

   override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
      return model.genreDictionary.count
   }

   override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
      let cell = tableView.dequeueReusableCell(withIdentifier: "GenreCells", for: indexPath) as! TableViewCell
      let d = model.genreDictionary
      cell.genreLabel?.text = d[d.keys.index(d.startIndex, offsetBy: indexPath.row)].key
      return cell
   }

当您需要某个表格 View 行的电影数组时，您可以使用以下内容

let d = model.genreDictionary
let arrayOfFilms = d[d.keys.index(d.startIndex, offsetBy: indexPath.row)].value