从 table 中搜索动态数据问题查看 swift 中的问题

Question

我的 table 视图上方有一个搜索栏。 table 视图中的数据来自我的服务。我正在尝试对 table 视图数据应用搜索过滤器。我已经尝试了一些代码，但它不工作。我的搜索栏代码是这样的，

    UIViewController,UISearchBarDelegate,UITextFieldDelegate,UITextViewDelegate,ShowsAlert
    @IBOutlet weak var searchBar: UISearchBar!

    var filteredData = [String]()
    var isSearching = false
    var dishNameArray = [String]()

     override func viewDidLoad() {
        super.viewDidLoad()

        menuView.isHidden = true
        reviewView.isHidden = true
        infoView.isHidden = true
        scrollView.isScrollEnabled = false

        //TableView Delegates
        menuTableView.delegate = self
        menuTableView.dataSource = self
        reviewTableView.delegate = self
        reviewTableView.dataSource = self
        reviewTableView.reloadData()
        searchBar.delegate = self
        searchBar.returnKeyType = UIReturnKeyType.done

        segmentControl.tintColor = #colorLiteral(red: 0.9529120326, green: 0.3879342079, blue: 0.09117665142, alpha: 1)

        searchBar.delegate = self

        dishNameLbl.text = name
        dishDescripLbl.text = resDesc
        minOrderLbl.text = minOrder
        deliveryLbl.text = deliveryTime

    }
     private func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
        isSearching = true
    }

    private func searchBarTextDidEndEditing(searchBar: UISearchBar) {
        isSearching = false
    }

    private func searchBarCancelButtonClicked(searchBar: UISearchBar) {
        isSearching = false
    }

    private func searchBarSearchButtonClicked(searchBar: UISearchBar) {
        isSearching = false
    }

    private func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {

        guard let searchText = searchBar.text else {
            isSearching = false
            return
        }

        filteredData = dishNameArray.filter({
            return [=12=].lowercased().contains(searchText.lowercased())
        })

        isSearching = filteredData.count > 0
        self.menuTableView.reloadData()
    }

    extension RestaurantMenuVC: UITableViewDelegate,UITableViewDataSource{


    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if tableView == menuTableView{
            if isSearching{
                return filteredData.count
            }
        return ResMenuService.instance.categoryModelInstance.count
        }
        else{
        return AllReviewsService.instance.allReviewsModel.count
        }
    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        if tableView == menuTableView{
            return 57
        }
        else{
            return 137
        }
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        if tableView == menuTableView{
            let cell = menuTableView.dequeueReusableCell(withIdentifier: "menuCell", for: indexPath) as! RestaurantMenuTableViewCell

        if isSearching{

            cell.dishTitleLbl.text = filteredData[indexPath.row]
            dishNameArray.append(cell.dishTitleLbl.text!)

            }
//        let cell = menuTableView.dequeueReusableCell(withIdentifier: "menuCell", for: indexPath) as! RestaurantMenuTableViewCell

        cell.dishTitleLbl.text = ResMenuService.instance.categoryModelInstance[indexPath.row].categoryName
        cell.cardView.layer.cornerRadius = 5
        cell.selectionStyle = .none
        return cell

        }
        else
        {
            let cell = reviewTableView.dequeueReusableCell(withIdentifier: "reviewCell", for: indexPath) as! AllReviewsTableViewCell

            cell.nameLbl.text = AllReviewsService.instance.allReviewsModel[indexPath.row].name
            cell.descriptionLbl.text = AllReviewsService.instance.allReviewsModel[indexPath.row].description
            cell.timeLbl.text = AllReviewsService.instance.allReviewsModel[indexPath.row].time
            cell.ratingView.rating = Double(AllReviewsService.instance.allReviewsModel[indexPath.row].rating)
            cell.backgroundColor = UIColor.clear
            cell.selectionStyle = .none
            return cell

        }
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

        if tableView == menuTableView{

           let minimumSpending = String(ResMenuService.instance.restaurntDetailModelInstance[indexPath.row].minimumSpending)

            UserDefaults.standard.set(minimumSpending, forKey: "minimumSpending")
            UserDefaults.standard.synchronize()

            let categoryModel = ResMenuService.instance.categoryModelInstance
            let subCategoryModel = ResMenuService.instance.categoryModelInstance[indexPath.row].subCategories
            let AddonCategoryModel = ResMenuService.instance.categoryModelInstance[indexPath.row].subCategories[0].items[0].addonCategory


//            if categoryId == subCategoryId{


                let storyboard = UIStoryboard(name: "Main", bundle: nil)
                        let vc = storyboard.instantiateViewController(withIdentifier: "RestaurantMenuDetailVC") as! RestaurantMenuDetailVC
                        vc.categoryModel = categoryModel
                        vc.subCategoryModel = subCategoryModel
                        vc.AddonCategoryModel = AddonCategoryModel
                        self.navigationController?.pushViewController(vc, animated: true)

            //}
        }
        else{
            print("Hello")
        }
    }


    }

但是当我输入内容时，它不会过滤数据。这是我的模型 class,

struct RestaurantDetailModel {

    public private(set) var restaurantId:String!
    public private(set) var shopLat:String!
    public private(set) var shopLng:String!
    public private(set) var street:String!
    public private(set) var town:String!
    public private(set) var zipCode:String!
    public private(set) var cellNo:String!
    public private(set) var landLine:Int!
    public private(set) var shopName:String!
    public private(set) var deliveryTime:Int!
    public private(set) var collectionTime:Int!
    public private(set) var facebookLink:String!
    public private(set) var twitterLink:String!
    public private(set) var googleLink:String!
    public private(set) var instagramLink:String!
    public private(set) var pinterestLink:String!
    public private(set) var address:String!
    public private(set) var preorderPref:String!
    public private(set) var orderStatus:Bool!
    public private(set) var minimumSpending:Int!

    public private(set) var restaurantTimings:[RestaurantTimingsModel]!

}

Answer 1

试试这个

func updateSearchResults(for searchController: UISearchController) {

        guard let searchtext = searchController.searchBar.text else {
            return
        }
        filteredData.removeAll(keepingCapacity: false)

        let filterPredicate = NSPredicate(format: "self contains[c] %@", argumentArray: [searchtext])

        filteredData = dishNameArray.filter { filterPredicate.evaluate(with: [=10=]) }
        print(filteredData)
        DispatchQueue.main.async {
            self.menuTableView.reloadData()
        }
}

Answer 2

您没有在任何地方将 isSearching 设置为 true。所以它总是假的。

因此 table 在您设置 isSearching = true

之前从不使用 filteredData

func updateSearchResults(for searchController: UISearchController) 是一个 UISearchControllerDelegate 方法。由于您没有使用 UISearchController，因此在您的情况下不会调用它。您需要使用 UISearchBarDelegate 函数。

尝试以下更改。 Reference used

在 viewDidLoad 中添加以下行：

searchBar.delegate = self

添加以下功能：

func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
    isSearching = true
}

func searchBarTextDidEndEditing(searchBar: UISearchBar) {
    isSearching = false
}

func searchBarCancelButtonClicked(searchBar: UISearchBar) {
    isSearching = false
}

func searchBarSearchButtonClicked(searchBar: UISearchBar) {
    isSearching = false
}

将您的 updateSearchResults 函数更改为：

func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {

    guard let searchText = searchBar.text else {
       isSearching = false
       return
    }

    filteredData = dishNameArray.filter({
        return [=12=].lowercased().contains(searchText.lowercased())
    })

    isSearching = filteredData.count > 0
    self.menuTableView.reloadData()
}

你还需要让你的 ViewController 符合 UISearchBarDelegate 所以添加它，像这样：

class ViewController: UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate

这在使用 UISearchController 时要容易得多。请参见下面的示例。

使用 UISearchController 的示例：

我刚刚将这个示例放在了一个 playground 中，它展示了如何使用 UISearchController 执行此操作。

import UIKit
import PlaygroundSupport

class ViewController: UITableViewController {

    let searchController = UISearchController(searchResultsController: nil)

    var names = [
        "John",
        "Terry",
        "Martin",
        "Steven",
        "Michael",
        "Thomas",
        "Jason",
        "Matthew"
    ]
    var filteredNames = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.title = "Search Example"

        searchController.searchResultsUpdater = self
        searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchBar.placeholder = "Search"
        navigationItem.searchController = searchController
        definesPresentationContext = true
    }

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

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if isFiltering() {
            return filteredNames.count
        } else {
            return names.count
        }
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell() // don't do this, i am for example.

        var name: String
        if isFiltering() {
            name = filteredNames[indexPath.row]
        } else {
            name = names[indexPath.row]
        }

        cell.textLabel?.text = name
        return cell
    }

    func searchBarIsEmpty() -> Bool {
        // Returns true if the text is empty or nil
        return searchController.searchBar.text?.isEmpty ?? true
    }

    func isFiltering() -> Bool {
        return searchController.isActive && !searchBarIsEmpty()
    }

    func filterContentForSearchText(_ searchText: String, scope: String = "All") {
        filteredNames = names.filter({( name : String) -> Bool in
            return name.lowercased().contains(searchText.lowercased())
        })

        tableView.reloadData()
    }
}

extension ViewController: UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        filterContentForSearchText(searchController.searchBar.text!)
    }
}

let vc = ViewController()
let nav = UINavigationController()
nav.viewControllers = [vc]

PlaygroundPage.current.liveView = nav

编辑 2：工作 SearchBar

import UIKit
import PlaygroundSupport

class ViewController: UITableViewController, UISearchBarDelegate {

    var searchBar: UISearchBar!
    var isFiltering = false

    var names = [
        "John",
        "Terry",
        "Martin",
        "Steven",
        "Michael",
        "Thomas",
        "Jason",
        "Matthew"
    ]
    var filteredNames = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.title = "Search Example"

        searchBar = UISearchBar(frame: CGRect(x: 0, y: 0, width: tableView.frame.width, height: 50))
        searchBar.delegate = self
        tableView.tableHeaderView = UIView(frame: CGRect(x: 0, y: 0, width: tableView.frame.width, height: 50))
        tableView.tableHeaderView?.addSubview(searchBar)
    }

    func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
        isFiltering = false
    }

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        isFiltering = false
    }

    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
        isFiltering = true
    }

    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        isFiltering = false
    }

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        guard let searchText = searchBar.text else {
            isFiltering = false
            return
        }

        filteredNames = names.filter({
            return [=15=].lowercased().contains(searchText.lowercased())
        })

        isFiltering = filteredNames.count > 0
        self.tableView.reloadData()
    }

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

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if isFiltering {
            return filteredNames.count
        } else {
            return names.count
        }
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell() // don't do this, i am for example.

        var name: String
        if isFiltering {
            name = filteredNames[indexPath.row]
        } else {
            name = names[indexPath.row]
        }

        cell.textLabel?.text = name
        return cell
    }

}

let vc = ViewController()
PlaygroundPage.current.liveView = vc

编辑 3：提供了新信息

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    guard let searchText = searchBar.text else {
        isFiltering = false
        return
    }

    filteredData = ResMenuService.instance.categoryModelInstance.filter({
        return [=16=].categoryName.lowercased().contains(searchText.lowercased())
    })

    isFiltering = filteredData.count > 0
    self.tableView.reloadData()
}

Answer 3

您需要添加如下功能来识别搜索状态：

func isSearching() -> Bool {
  return searchController.isActive && !searchBarIsEmpty()
}

func searchBarIsEmpty() -> Bool {
  // Returns true if the text is empty or nil
  return searchController.searchBar.text?.isEmpty ?? true
}

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