ios - 如何使用 Swift 创建 UISearchBar 以搜索我的 Tableview 数据的选项？

Question

在我的例子中，我正在尝试为我的 tableview 数据实现 search 功能。在这里，我将 JSON 数据加载到我的 Tableview section 和 rows 中。在自定义 cell 中，我正在显示名称，我想按名称创建搜索。我尝试了下面的代码，但结果中没有显示任何内容。如何以正确的方式实现搜索功能。

var sections = [Section]()
var filteredNames = [Section]()
var searchController : UISearchController!

表格 View 代表

// MARK: UITableview Delegates

    func numberOfSections(in tableView: UITableView) -> Int {
        return sections.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if isFiltering {
            return filteredNames[section].result.count
        } else {
            return sections[section].result.count
        }
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return sections[section].title
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell:MyCustomCell = self.tableView.dequeueReusableCell(withIdentifier: cellReuseIdentifier) as! MyCustomCell
        let item = sections[indexPath.section].result[indexPath.row]
        let filteritem = filteredNames[indexPath.section].result[indexPath.row]
        if isFiltering {
            cell.nameLabel.text = filteritem.name
        } else {
            cell.nameLabel.text = item.name
        }
        return cell
    }

SearchBarAction 和代理

 // MARK: UISearchBar Delegates

@IBAction func searchAction(_ sender: Any) {

    searchController = UISearchController(searchResultsController: nil)
    searchController.hidesNavigationBarDuringPresentation = false
    searchController.searchBar.keyboardType = UIKeyboardType.asciiCapable
    searchController.searchBar.barTintColor = #colorLiteral(red: 0.317096545, green: 0.5791940689, blue: 0.3803742655, alpha: 1)
    searchController.searchBar.backgroundColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
    searchController.dimsBackgroundDuringPresentation = false

    // Make this class the delegate and present the search
    self.searchController.searchBar.delegate = self
    searchController.searchResultsUpdater = self
    present(searchController, animated: true, completion: nil)
}

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    guard let searchText = searchBar.text else {
        isFiltering = false
        return
    }
    filteredNames = sections[indexPath.section].result[indexPath.row].filter({
        return $0.lowercased().contains(searchText.lowercased())
    })
    isFiltering = filteredNames.count > 0
    self.tableView.reloadData()
}

Error: I am getting error - Use of unresolved identifier 'indexPath'; did you mean 'IndexPath'?

Answer 1

首先你要过滤部分 所以命名数组

var filteredSections = [Section]()

filteredNames 具有误导性，暗示数组是 [String]

一个可能的解决方案是使用过滤后的内容创建新的部分

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    if !searchText.isEmpty {
        filteredSections = sections.compactMap { section -> Section? in
            let filteredContent = section.result.filter {$0.name.range(of: searchText, options: .caseInsensitive) != nil }
            return filteredContent.isEmpty ? nil : Section(title: section.title, result: filteredContent)
        }
        isFiltering = true  
    } else {  
        filteredSections.removeAll()
        isFiltering = false
    }
    self.tableView.reloadData()
}

并且表格 View 数据源方法必须更改为

func numberOfSections(in tableView: UITableView) -> Int {
    return isFiltering ? filteredSections.count : sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    let currentSection = isFiltering ? filteredSections[section] : sections[section]
    return currentSection.result.count
}

func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return isFiltering ? filteredSections[section].title : sections[section].title
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = self.tableView.dequeueReusableCell(withIdentifier: cellReuseIdentifier, for: indexPath) as! MyCustomCell
    let section = isFiltering ? filteredSections[indexPath.section] : sections[indexPath.section]
    let item = section.result[indexPath.row]
    cell.nameLabel.text = item.name
    return cell
}