如何快速从模型中搜索数据？

Question

我想使用搜索栏在表格视图中搜索一些数据，但是当我尝试在我的模型中查找数据时，我无法搜索该数据。
我创建了一个展开的表格视图单元格并创建了一个用于搜索数据的搜索栏，但我仍然无法搜索模型中的数据。我怎样才能做到这一点？

这是我的代码：

import UIKit

class FAQViewController: UIViewController, UITableViewDataSource {

    var dataFaq = [modelFAQ]()

    let items = [
        modelFAQ(name: "1. search box", description: "The design led users to instinctively search for their question first before clicking the FAQs"),
        modelFAQ(name: "2.list of FAQs ", description: "Customers clicked around on the FAQs first."),
        modelFAQ(name: "3. customers", description: "top issues first and then use the search for the questions instead of browsing and yielding more relevant results")

        ]

    @IBOutlet fileprivate weak var tableView: UITableView!
    @IBOutlet weak var searchDataBar: UISearchBar!
    fileprivate var indexPaths: Set<IndexPath> = []
    var cellIdentifier = "dataSourceFAQ"

    var searchData = [String]()
    var searching = false

    override var preferredStatusBarStyle: UIStatusBarStyle{
        return .lightContent
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        setupTableView()
        searchDataBar.delegate = self
    }

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

        if searching {
            return searchData.count
        }else {
            return items.count
        }
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! FAQTableViewCell

        if searching{
            cell.titleLabel.text = searchData[indexPath.row]
        }else{
            cell.titleLabel.text = items[indexPath.row].name
        }

        let nameDetail = self[indexPath].name as? String
        let description = self[indexPath].description


        cell.update(name: nameDetail ?? "0", description: description)


        cell.state = cellIsExpanded(at: indexPath) ? .expanded : .collapsed
        return cell
    }

    override func viewWillAppear(_ animated: Bool) {
        tabBarController?.tabBar.isHidden = true
    }

    private func setupTableView(){
        tableView.delegate = self
        tableView.dataSource = self
        tableView.rowHeight = UITableView.automaticDimension
        tableView.estimatedRowHeight = 200.0
        tableView.separatorStyle = .none
         }

     }

    extension FAQViewController: UITableViewDelegate{
        func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
            let cell = tableView.cellForRow(at: indexPath) as!FAQTableViewCell


            cell.state = .expanded
            self.addExpandedIndexPath(indexPath)

            tableView.beginUpdates()
            tableView.endUpdates()
            print("1")
        }

    func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
        let cell = tableView.cellForRow(at: indexPath) as! FAQTableViewCell

        cell.state = .collapsed
        self.removeExpandedIndexPath(indexPath)


        tableView.beginUpdates()
        tableView.endUpdates()
        print("2")
}
}

extension FAQViewController {
    func cellIsExpanded(at indexPath: IndexPath) -> Bool {
        return indexPaths.contains(indexPath)
    }

    func addExpandedIndexPath(_ indexPath: IndexPath) {
        indexPaths.insert(indexPath)
    }

    func removeExpandedIndexPath(_ indexPath: IndexPath) {
        indexPaths.remove(indexPath)
    }
}

extension FAQViewController {
    subscript(indexPath: IndexPath) -> modelFAQ {
        return items[indexPath.row]
    }
}


    extension FAQViewController: UISearchBarDelegate {

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

            searchData = searchText.isEmpty ? items: items.filter{ $0.name(searchText)}

            searching = true
            tableView.reloadData()
        }
       }

这是我的表格视图单元格

    import UIKit

    class FAQTableViewCell: UITableViewCell {

        enum cellState{
            case collapsed
            case expanded

            var carretImage: UIImage {
                switch self {
                case .collapsed:
                    return UIImage(named: "ic_arrow_down")!
                case .expanded:
                    return UIImage(named: "ic_arrow_up")!
                }
            }

        }

        @IBOutlet private weak var stackView: UIStackView!
        @IBOutlet private weak var containerView: UIView!
        @IBOutlet weak var titleLabel: UILabel!
        @IBOutlet private weak var carret: UIImageView!
        @IBOutlet private weak var descriptionLabel: UILabel!


        private let expandedViewIndex: Int = 1

        var state: cellState = .expanded {
            didSet{
                toggle()
            }
        }

        override func awakeFromNib() {
            selectionStyle = .none
            containerView.layer.cornerRadius = 5.0
        }

        private func toggle(){
            stackView.arrangedSubviews[expandedViewIndex].isHidden = stateIsCollapsed()
            carret.image = state.carretImage
        }

        private func stateIsCollapsed() -> Bool{
            return state == .collapsed
        }

        func update(name: String, description: String){
            titleLabel.text = name
            descriptionLabel.text = description

        }
    }

这是我的模型

    struct modelFAQ {
        var name: String
        var description: String
    }

Answer 1

两个问题：

1. 您必须将searchData 声明为与主数据相同的类型。

   顺便说一下根据命名约定结构和类名都以大写字母开头

   var searchData = [ModelFAQ]()
   

2. 搜索filter 闭包是错误的。写

   searchData = searchText.isEmpty ? items : items.filter{ $0.name.contains(searchText)}
   

   或者如果你想搜索不区分大小写

   searchData = searchText.isEmpty ? items : items.filter{ $0.name.range(of: searchText, options: .caseInsensitive) != nil }
   

而且你必须更改cellForRowAt

cell.titleLabel.text = searchData[indexPath.row].name

Answer 2

注意：类/结构名称始终以大写字母

开头

• 错误：型号常见问题解答

• 正确：模型常见问题解答

你犯了一个错误，你必须像下面这样声明你的 searchData 数组

var searchData = [ModelFAQ]()

在数据源方法中，您必须从 ModelFAQ 对象中获取名称并将其分配给您的标签。

希望对你有所帮助。