搜索栏为空或 nil 时表格为空

Question

当我搜索商店时，桌子会找到正确的商店。但是当我编辑我的搜索词（例如删除一个字母）时，表格变为空。即使我删除了搜索词，表格也会变成空的！我必须转到不同的视图控制器并返回搜索栏才能查看完整的表格。

这是我的代码

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

    shops = shops.filter { $0.shopname.range(of: searchText, options: .caseInsensitive, range: nil, locale: nil) != nil}


    tableView.reloadData()

}

我应该在哪里实现if searchBar.text == "" || searchBar.text ==nill 返回原始表格单元格。或者当再次搜索时，我希望它执行另一次搜索。

更新

我的商店数组不是字符串类型，而是其中包含字符串的类类型。因为它是一个自定义单元格，其中包含来自 api 的 JSON 数据

 var shops: [Shops]!
var isSearch = false
var auxiliar : [String] = []
var searchActive: Bool = false



class Shops {
private var _familiy_id: String?
private var _logo : String?

private var _shopname : String?

var familiy_id : String{
    return _familiy_id!
}

   var shopname : String{
    return _shopname!
}
var Logo : String{
    return _logo!
}
init(shopname : String , Logo : String , family_id : String) {

    self._shopname = shopname
           self._logo = Logo
    self._familiy_id = family_id
}

}

Answer 1

问题出在这一行：

shops = shops.filter {  ... }

由于您只是应用过滤器并与原始数组重叠，因此您将丢失元素。需要一个辅助数组来帮助保留原始数组。

一个简单的例子：（代码更新）

import UIKit

class Shops {
    private var _familiy_id: String?
    private var _logo : String?
    private var _shopname : String?

    var familiy_id : String{
        return _familiy_id!
    }

    var shopname : String{
        return _shopname!
    }
    var Logo : String{
        return _logo!
    }
    init(shopname : String , Logo : String , family_id : String) {
        self._shopname = shopname
        self._logo = Logo
        self._familiy_id = family_id
    }
}



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

    var shops : [Shops]! = []
    var auxiliar : [Shops]!

    override func viewDidLoad() {
        super.viewDidLoad()
        // 1 - load data to shops array
        shops.append(Shops(shopname: "Brasil", Logo: "BR", family_id: "1"))
        shops.append(Shops(shopname: "Brasolia", Logo: "BA", family_id: "2"))
        shops.append(Shops(shopname: "Colombia", Logo: "CO", family_id: "3"))
        shops.append(Shops(shopname: "Argentina", Logo: "AR", family_id: "4"))




        // 2  - auxiliar receive the complete original array
        auxiliar = shops

        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell")!
        cell.textLabel?.text = auxiliar[indexPath.row].shopname
        return cell
    }

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
         auxiliar = shops.filter { $0.shopname.range(of: searchText, options: .caseInsensitive, range: nil, locale: nil) != nil }
        if searchText == "" {
            // 3 if there is nothing to search, auxiliar receive the complete orihinal array
            auxiliar = shops
        }

        tableView.reloadData()
    }
}

Answer 2

在 Swift 3 中，您可以使用这样的代码。您只需尝试此代码即可。

import UIKit

class SearchBarTableView: UIViewController, UITableViewDataSource,UITableViewDelegate, UISearchBarDelegate {

  @IBOutlet weak var tableView: UITableView!
  @IBOutlet weak var searchBar: UISearchBar!

  var shops : [String] = ["Brasil", "Argentina", "Colombia", "Chile", "Equador", "Peru", "Uruguai", "Paraguai", "Venezuela"];
  var auxiliar : [String] = []
  var searchActive: Bool = false

  override func viewDidLoad()
  {
      super.viewDidLoad()
      self.tableView.dataSource = self
      self.tableView.delegate = self
      self.searchBar.delegate = self
  }

  func searchBarTextDidBeginEditing(_ searchBar: UISearchBar)
  {
      self.searchActive = true
  }

  func searchBarTextDidEndEditing(_ searchBar: UISearchBar)
  {
      self.searchActive = false
  }

  func searchBarCancelButtonClicked(_ searchBar: UISearchBar)
  {
      self.searchActive = false
  }

  func searchBarSearchButtonClicked(_ searchBar: UISearchBar)
  {
      self.searchActive = false
  }

  func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String)
  {
      self.auxiliar = self.shops.filter({ (text) -> Bool in
      let temp: NSString = text as NSString
      let range = temp.range(of: searchText, options:.caseInsensitive)
     return range.location != NSNotFound
     })

      if self.auxiliar.count == 0
      {
          searchActive = false
      }
      else
      {
          searchActive = true
      }
      self.tableView.reloadData()
  }


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

  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
      if searchActive
      {
      return auxiliar.count
      }
      return shops.count
  } 

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
      let cell = tableView.dequeueReusableCell(withIdentifier: "cell")!
      if searchActive
      {
          cell.textLabel?.text = auxiliar[indexPath.row]
      }
      else
      {
          cell.textLabel?.text = shops[indexPath.row]
      }  
      return cell
  }