当我删除它时，UISearchController不会删除结果

Question

我在我的应用程序中实现了UISearchController，以搜索用户关注并取消关注。我使用swift和Parse作为后端。问题是，无论何时我想输入内容然后删除它，它都会保留检索结果并不会删除它们。当没有结果时，表格视图显示检索结果为“无结果”，因为没有删除！ 我找不出什么问题。任何帮助？

下面是代码，

UISearchController委托和方法，

// To search 
var userSearchController: UISearchController! 
var resultsController = UITableViewController() 
var searchActive: Bool = false 

// To follow and unfollow users 
var userIds = [""] 
var isFollowing = ["":false] 


// MARK: - Lifecycle 

override func viewDidLoad() { 
    super.viewDidLoad() 

    // tableview delegate and datasource 
    self.resultsController.tableView.dataSource = self 
    self.resultsController.tableView.delegate = self 

    self.resultsController.loadViewIfNeeded() 
    configureSearchController() 
} 

func configureSearchController(){ 

    self.userSearchController = UISearchController(searchResultsController: nil) 
    // Set the search controller to the header of the table 
    self.tableView.tableHeaderView = self.userSearchController.searchBar 
    // This is used for dynamic search results updating while the user types 
    // Requires UISearchResultsUpdating delegate 
    self.userSearchController.searchResultsUpdater = self 
    self.userSearchController.dimsBackgroundDuringPresentation = false 
    self.definesPresentationContext = true 

    // Configure the search controller's search bar 
    self.userSearchController.searchBar.placeholder = "Search for a parent" 
    self.userSearchController.searchBar.sizeToFit() 
    self.userSearchController.searchBar.delegate = self 
} 

// MARK: - Search Bar Delegate Methods 

func searchBarSearchButtonClicked(searchBar: UISearchBar) { 

    let searchString: String = searchBar.text!.lowercaseString 
    if searchActive == false { 
     searchActive = true 
     // Force search if user pushes button 
     if (searchString != "") { 
      loadSearchUsers(searchString) 
     } 

     self.resultsController.tableView.reloadData() 

    } 
} 

func searchBarTextDidBeginEditing(searchBar: UISearchBar) { 
    searchActive = true 

} 

func searchBarTextDidEndEditing(searchBar: UISearchBar) { 
    searchActive = false 

} 


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

    if (searchBar.text == ""){ 
     searchActive = false 
    } 
    else { 
     searchActive = true 
     let searchString: String = searchBar.text!.lowercaseString 
     if (searchString != ""){ 
      loadSearchUsers(searchString)} 
    } 

} 

func searchBarCancelButtonClicked(searchBar: UISearchBar) { 

    searchActive = false 
    searchBar.text = "" 
    self.searchUsers.removeAll(keepCapacity: false) 

    self.resultsController.tableView.reloadData() 

} 

func updateSearchResultsForSearchController(searchController: UISearchController) { 

    if let searchString: String = searchController.searchBar.text!.lowercaseString { 

     if (searchString != "" && !self.searchActive) { 
      loadSearchUsers(searchString) 
     } 
    } 
} 

这里是numberOfSectionsInTableView

override func numberOfSectionsInTableView(tableView: UITableView) -> Int { 

    var numOfSection: NSInteger = 0 

    if userIds.count > 0 { 
     //self.resultsController.tableView.reloadData() 
     self.tableView.backgroundView = nil 
     self.tableView.separatorStyle = UITableViewCellSeparatorStyle.SingleLine 
     numOfSection = 1 


    } else { 

     let noDataLabel: UILabel = UILabel(frame: CGRectMake(0, 0, self.tableView.bounds.size.width, self.tableView.bounds.size.height)) 
     noDataLabel.text = "No result." 
     noDataLabel.textColor = UIColor(red: 22.0/255.0, green: 106.0/255.0, blue: 180.0/255.0, alpha: 1.0) 
     noDataLabel.textAlignment = NSTextAlignment.Center 
     self.tableView.backgroundView = noDataLabel 
     self.tableView.separatorStyle = UITableViewCellSeparatorStyle.None 
    } 

    return numOfSection 
} 

让我知道如果你需要更多的信息。非常感谢。

Answer 1

表格数据不会因为您在搜索文本中进行更改而被删除。您必须首先清除数据集，然后将搜索结果设置为数据集，然后重新加载，您已在searchBarCancelButtonClicked方法中执行此操作。

self.searchUsers.removeAll() 
self.searchUsers.appendContentsOf(results) 
self.resultsController.tableView.reloadData() 

Answer 2

也许你忘了table.reloadData（）。试试这个代码

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

var dataArray = [1 : "first" ,2 : "second",3 :"third",] 
var filteredArray = [String]() 
var gotResult = false 

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) 
{ 
    self.view.endEditing(true); 
    self.searchBar.endEditing(true) 
    gotResult = false 
    table.reloadData() 
} 
func searchBarTextDidBeginEditing(searchBar: UISearchBar) 
{ 
    gotResult = true 
    table.reloadData() 
} 
func searchBarSearchButtonClicked(searchBar: UISearchBar) 
{ 
    if !gotResult 
    { 
     gotResult = true 
     table.reloadData() 
    } 
    searchBar.resignFirstResponder() 
} 

func searchBar(searchBar: UISearchBar, textDidChange searchedText: String) 
{ 

    filteredArray = dataArray.values.filter({ (Items) -> Bool in 
     let currentItem: NSString = Items 

     return (currentItem.rangeOfString(searchedText, options: NSStringCompareOptions.CaseInsensitiveSearch).location) != NSNotFound 
    }) 

    self.table.reloadData() 
} 
//Codes for table 
func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
    return 1 
} 
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
    if gotResult { 
     return filteredArray.count 
    } 
    else { 
     return dataArray.count 
    } 
} 

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
    let cell = UITableViewCell(); 
    let value = Array(dataArray.values)[indexPath.row] 

    if gotResult { 
     cell.textLabel?.text = filteredArray[indexPath.row] 
    } 
    else { 
     cell.textLabel?.text = value 

    } 

    return cell 
}