使用部分过滤SwiftUITableView的问题-未显示结果

本质上，我有一个 tableview，它显示了一个名称数组并将它们分成几个部分 - 我最近添加了一个搜索栏来过滤数据，但是我在呈现过滤数据时遇到了问题，我没有收到任何错误，只是一个空数组集.

以下是我如何呈现/尝试过滤数据：

var sections = [customerListSection]()
var structure = [customerList]()
var filteredSections = [customerListSection]()
var filteredStructure = [customerList]()



func filterContentForSearchText(_ searchText: String, scope: String = "All") {
    
    filteredStructure = structure.filter({( customers : customerList) -> Bool in
        return customers.customer.lowercased().contains(searchText.lowercased())
    })
    tableView.reloadData()
}

从我的测试来看，No Customers每次我尝试使用搜索时都会出现打印件，这让我认为filteredSections 没有被更新。有什么想法吗？见下文：

override func numberOfSections(in tableView: UITableView) -> Int {
    
    if isFiltering() {

        if filteredSections.count == 0 {
            print("No Customers")
        } else {
            tableView.restore()
        }
        
        return filteredSections.count
    }
    
    if sections.count == 0 {
  
    } else {
        tableView.restore()
    }
    return sections.count

}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if isFiltering() {
        return filteredSections[section].items.count
    }
    return sections[section].items.count
}


override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    
    
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
    
    //let item = sections[indexPath.section].items[indexPath.row]
    
    let customerList: customerList
    if isFiltering() {
        customerList = filteredSections[indexPath.section].items[indexPath.row]
        cell.textLabel!.text = customerList.customer
    } else {
        customerList = sections[indexPath.section].items[indexPath.row]
        cell.textLabel!.text = customerList.customer
    }
    
    
    return cell
}

结构：

struct customerListSection {
    let customerType : String
    var items : [customerList]
}

struct customerList: Decodable {
    let customerid: Int
    let customer: String
    let type: String
}

这就是我使用 json 填充 tableview 的方式：

private func fetchJSON() {
    guard let url = URL(string: "server.com")
    else { return }
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.httpBody = "value=1".data(using: .utf8)
    URLSession.shared.dataTask(with: request) { data, _, error in
        guard let data = data else { return }
        do {
            let decoder = JSONDecoder()
            decoder.keyDecodingStrategy = .convertFromSnakeCase
            let res = try decoder.decode([customerList].self, from: data)
            let grouped = Dictionary(grouping: res, by: { $0.type })
            var keys = grouped.keys.sorted()
            if let index = keys.firstIndex(of: "Display On Top") {
                let first = keys.remove(at: index)
                keys.insert(first, at: 0)
            }
            self.sections = keys.map({customerListSection(customerType: $0, items: grouped[$0]!)})
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
        }
        catch {
            print(error)
        }
    }.resume()
}