搜索栏为空或 nil 时表格为空
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【中文标题】搜索栏为空或 nil 时表格为空【英文标题】：Table is empty when search bar is empty or nil 【发布时间】：2017-08-10 22:15:35 【问题描述】：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
【问题讨论】：
【参考方案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()
【讨论】：
您能否检查我更新的问题以查看我的商店数组的错误 没问题，只需将辅助声明为 var auxiliar : [Shops]！并使用您正在使用的过滤器表单。 问题是let temp: NSString = text as NSString中的text
谢谢 :) 迫不及待想看看这个问题是如何解决的
shops has no member range`这实际上是错误【参考方案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
【讨论】：
感谢您的回答。您能否查看我更新的问题以查看由于我的shop 数组类型而导致的错误以上是关于搜索栏为空或 nil 时表格为空的主要内容，如果未能解决你的问题，请参考以下文章