Swift 3：プログラム的に機能するスコープバー

Question

私はプログラムでテーブルビューに検索バーを設定し、検索バーにスコープバーを追加しました。私は、ユーザーがスコープボタンの1つをタップするときに正しい情報を表示する方法を理解しようとしています。たとえば、「Sweet」スコープボタンをタップすると、データモデルのsweetに関連付けられているすべての果物のみが表示されます。これまでのコードです：

Answer 1

まず、filterContentsforSearchTextメソッドを更新してください。 searchTextが空の場合は、すぐにcategoryMatchを返す必要があります：

func filterContentsforSearchText(searchText: String, scope: String = "All"){ 
    filteredFruits = fruits.filter { fruit in 
     let categoryMatch = (scope == "All") || (fruit.category == scope) 
     if searchText.isEmpty { 
      return categoryMatch 
     } 
     return categoryMatch && fruit.name.lowercased().contains(searchText.lowercased()) 
    } 

    myTable.reloadData() 
} 

はその後、すべての searchController.searchBar.text != ""文を削除、あなたが任意のより多くのそれらを必要としません。

最終的なコード：

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate, UISearchResultsUpdating { 

    @IBOutlet weak var myTable: UITableView! 

    var fruits = [Fruits]() 
    var filteredFruits = [Fruits]() 
    var selectIndex: IndexPath = IndexPath() 
    var fruitName: String! 
    var myArray = ["All", "Sweet", "Fresh", "Other"] 
    var sweets = [String]() 

    var searchController = UISearchController(searchResultsController: nil) 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 

     fruits = [ 
      Fruits(category: "Fresh", name: "Apple"), 
      Fruits(category: "Fresh", name: "Strawberry"), 
      Fruits(category: "Sweet", name: "Mango"), 
      Fruits(category: "Sweet", name: "Cherry"), 
      Fruits(category: "Sweet", name: "Grapes"), 
      Fruits(category: "Other", name: "Orange"), 
      Fruits(category: "Sweet", name: "Banana"), 
      Fruits(category: "Fresh", name: "Tomatoe"), 
     ] 

     myTable.delegate = self 
     myTable.dataSource = self 

     searchController.dimsBackgroundDuringPresentation = false 
     self.definesPresentationContext = true 
     searchController.searchResultsUpdater = self 
     searchController.searchBar.scopeButtonTitles = ["All", "Sweet", "Fresh", "Other"] 
     searchController.searchBar.delegate = self 
     myTable.tableHeaderView = searchController.searchBar 
     searchController.searchBar.barTintColor = UIColor.white 
    } 

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

    } 
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 

     if searchController.isActive { 
      return filteredFruits.count 
     } 

     return fruits.count 
    } 

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 
     fruitName = fruits[indexPath.row].name 
     let cell = myTable.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) 
     let fruit: Fruits 
     if searchController.isActive { 
      fruit = filteredFruits[indexPath.row] 
     } else { 
      fruit = fruits[indexPath.row] 
     } 

     if fruits[indexPath.row].category == "Sweet"{ 
      sweets = [fruits[indexPath.row].category] 
      print(sweets) 

     } 

     cell.textLabel?.text = fruit.name 
     cell.detailTextLabel?.text = fruit.category 


     return cell 
    } 

    //SearchBar 
    func updateSearchResults(for searchController: UISearchController) { 
     let searchBar = searchController.searchBar 
     let scope = searchBar.scopeButtonTitles![searchBar.selectedScopeButtonIndex] 
     filterContentsforSearchText(searchText: searchController.searchBar.text!, scope: scope) 

    } 

    func filterContentsforSearchText(searchText: String, scope: String = "All"){ 
     filteredFruits = fruits.filter { fruit in 
      let categoryMatch = (scope == "All") || (fruit.category == scope) 
      if searchText.isEmpty { 
       return categoryMatch 
      } 
      return categoryMatch && fruit.name.lowercased().contains(searchText.lowercased()) 
     } 

     myTable.reloadData() 
    } 

    func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) { 
     filterContentsforSearchText(searchText: searchBar.text!, scope: searchBar.scopeButtonTitles![selectedScope]) 

     print("selectedScope: \(selectedScope)") 
     if selectedScope == 1{ 
      print("Sweet") 
     } 

    } 
} 

そして、あなたが期待どおりに働いています！