Question

我正在创建一个涉及自定义tableviewcell的taleview的应用程序。我在tableviewcontroller中使用三个数组来在tableview中显示。一旦用户选择该行，它就会根据我创建的urlArray将它们带到url。这完全正常，直到我在tableview中实现搜索，然后当我搜索tableview并单击一个单元格转到我的数组内的第三个或第四个url时，这将是错误的url。

这是tableviewcontroller的代码。

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate {
    @IBOutlet weak var searchBar: UISearchBar!
    @IBOutlet weak var tableview: UITableView!

    var arrUrlName = ["https://www.zacks.com/stock/quote/AAPL?q=aapl?q=AAPL?q=AAPL","https://www.zacks.com/stock/quote/GOOG?q=goog?q=GOOG?q=GOOG","https://www.zacks.com/stock/quote/FB?q=fb?q=FB?q=FB","https://www.zacks.com/stock/quote/AMZN?q=amzn?q=AMZN?q=AMZN"]
    var stockNames = ["Apple Inc.","Google Inc.","Facebook Inc.","Amazon"]
    var symbolArray = ["AAPL","GOOG","FB","AMZN"]

    let cellIdentifier = "Cell"

    var filteredData: [String]!

    override func viewDidLoad() {
        super.viewDidLoad()

        filteredData = stockNames

        self.tableview.dataSource = self
        self.tableview.delegate = self
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.filteredData.count
    }

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

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

        let arrayName =  filteredData[indexPath.row]
        let arraySymbol = symbolArray[indexPath.row]

        cell.stockNameLabel?.text = arrayName
        cell.symbolLabel?.text = arraySymbol

        return cell
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let urlName = self.arrUrlName[indexPath.row]
        let url = URL(string: urlName)

        if #available(iOS 10.0, *) {
            UIApplication.shared.open(url!, options: [:], completionHandler: nil)
        } else {
            UIApplication.shared.openURL(url!)
        }
    }

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        // When there is no text, filteredData is the same as the original data

        if searchText.isEmpty {
            filteredData = stockNames
        } else {
            // The user has entered text into the search box
            // Use the filter method to iterate over all items in the data array
            // For each item, return true if the item should be included and false if the
            // item should NOT be included
            filteredData = stockNames.filter({(dataItem: String) -> Bool in
                // If dataItem matches the searchText, return true to include it
                if dataItem.range(of: searchText, options: .caseInsensitive) != nil {
                    return true
                } else {
                    return false
                }
            })
        }
        tableview.reloadData()
    }

    func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {

        searchBar.showsCancelButton = true
    }

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {

        searchBar.showsCancelButton = false
        searchBar.text = ""
        searchBar.resignFirstResponder()
    }
}

Answer 1

您需要更好地整理数据。而不是三个单独的数组，有一个数组。数组的每个元素应该是具有三个值或更好的字典，一个struct具有三个属性。

这使得对表格视图的数据进行排序和过滤变得更加容易。

Answer 2

问题是您正在过滤stockNames，但保留arrUrlName和symbolArray未过滤。选择行后，您在这里选择了错误的网址：

let urlName = self.arrUrlName[indexPath.row]

因为stockNames和arrUrlName的索引不再同步。

推荐 解决方案：

解决此问题的最简单方法是在单个阵列中重新组织数据。首先，创建结构

struct TableItem {
    let url: String
    let name: String
    let symbol: String
}

然后，重新组织单个数组中的数据，如

let data = [
   TableItem(
      url: "https://www.zacks.com/stock/quote/AAPL?q=aapl?q=AAPL?q=AAPL",
      name: "Apple Inc.",
      symbol: "AAPL"
   ),
   TableItem(
      url: "https://www.zacks.com/stock/quote/GOOG?q=goog?q=GOOG?q=GOOG",
      name: "Google Inc.",
      symbol: "GOOG"
   ),
   TableItem(
      url: "https://www.zacks.com/stock/quote/FB?q=fb?q=FB?q=FB",
      name: "Facebook Inc.",
      symbol: "FB"
   ),
   TableItem(
      url: "https://www.zacks.com/stock/quote/AMZN?q=amzn?q=AMZN?q=AMZN",
      name: "Amazon",
      symbol: "AMZN"
    )
]

设置初始filteredData

var filteredData = data

使用以下内容填充cellForRowAt:中的单元格数据

let item = filteredData[indexPath.row]

cell.stockNameLabel?.text = item.name
cell.symbolLabel?.text = item.symbol

修正过滤：

filteredData = data.filter { $0.name.range(of: searchText, options: .caseInsensitive) != nil }

所以方法成为：

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    if searchText.isEmpty {
        filteredData = data
    } else {
        filteredData = data.filter { $0.name.range(of: searchText, options: .caseInsensitive) != nil }
    }
    tableview.reloadData()
}

这样，符号和网址也会被过滤掉。

在didSelectRowAt:中，您可以获取您的网址：

let item = filteredData[indexPath.row]
let url = URL(string: item.url)

使用Ul的UITableViewCell

2 个答案: