swift - 如何显示搜索结果，没有结果就没有结果文字？

Question

我试图只显示结果而不是解析服务器的所有数据。我尝试了不同的方法(大部分相同)，但我失败了。我知道我错过了什么。

我的问题是如果没有结果，如何在屏幕上只显示结果以及不显示结果文本。

您可以在下面找到我的方法。

非常感谢您。

class SearchTableViewController: UITableViewController, UISearchBarDelegate, UISearchResultsUpdating {
    
    @IBOutlet weak var searchBar: UISearchBar!
    
    var searchActive : Bool = false
    var data:[PFObject]!
    var noteObjects: NSMutableArray! = NSMutableArray()
    var filtered:[PFObject]!
    
    
    var refresher: UIRefreshControl = UIRefreshControl()
    var searchController = UISearchController()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        search()
        searchBar.delegate = self
        self.refresher.addTarget(self, action: #selector(refresh), for: .valueChanged)

        self.tableView?.addSubview(refresher)
        self.searchDisplayController?.searchResultsTableView.rowHeight = tableView.rowHeight;
        
       

        
    }
    
    @objc func refresh() {
        print("Refreshed")
        self.refresher.endRefreshing()
        search()
    }
    
    
    @objc func search(searchText: String? = nil){
        
        let query = PFQuery(className: "NewUsers")
        query.whereKey("user", equalTo: PFUser.current() as Any)
        if(searchText != nil){
            query.whereKey("name", contains: searchText)
            
            
        }
        query.findObjectsInBackground { (objects, error) in
            
            
            
            if error == nil {
                if let cars = objects {
                    
                    
                    for object in cars {
                        if (object as PFObject?) != nil {
                           
                            self.data = objects
                            self.tableView.reloadData()
                           
                        }
                    }
                }
            }
        }
        
    }
    
    func updateSearchResults(for searchController: UISearchController) {
        self.filtered.removeAll(keepingCapacity: false)
        let searchText = searchController.searchBar.text
        let query: PFQuery = PFQuery(className: "NewUsers")
        if searchController.isActive == true  {
            query.whereKey("name", matchesRegex: searchText!, modifiers: "i")
            self.tableView.reloadData()
        }
        query.findObjectsInBackground { (results, error) in
            self.filtered = results
            self.tableView.reloadData()
        }
        
        print(searchText as Any)
        
        
    }
    
    var shouldUseSearchResult : Bool {
        if let searchText = searchController.searchBar.text {
            if searchText.isEmpty {
                return false
            }
        }
        return searchController.isActive
    }
    
    
    


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

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if data != nil {
            return self.data.count
        }
        return 0
    }

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

        let obj = self.data[indexPath.row]
        
        self.name = (obj["name"] as? String)!
        self.surname = (obj["surname"] as? String)!
        self.birthdate = (obj["birthday"] as? String)!
        self.age = (obj["age"] as? String)!
        self.city = (obj["city"] as? String)!
        
        cell.dateLabel.text = ": " + birthday
        cell.ageLabel.text = ": \(age)"
        cell.userLabel.text = ": " + name + " " + surname
        

        return cell
    }
    
    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
        searchActive = true;
    }
    
    func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
        searchActive = false;
        
        
    }
    
    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        searchActive = false;
        self.searchBar.endEditing(true)
        
        
    }
    
    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        searchActive = false;
        self.searchBar.endEditing(true)
    }
    
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        search(searchText: searchText)
        
    }
    
    
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        
        return true
    }
    
    
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
        
        self.searchBar.resignFirstResponder()
        
    }
    
    

}

Answer 1

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

    if (self.data.count == 0)
    {
        let noDataLabel: UILabel     = UILabel(frame: CGRect(x: 0, y: 0, width: self.tableView.bounds.size.width, height: tableView.bounds.size.height))
        noDataLabel.text          = "No Result Found."
        noDataLabel.textColor     = UIColor.red
        noDataLabel.textAlignment = .center
        self.tableView.backgroundView  = noDataLabel
        self.tableView.backgroundColor = UIColor.white
        self.tablevİEW.separatorStyle  = .none
    }
        return 1

}

self.arrayDealPage是array & self.dealsTable是tableView希望，它可能对您和 delegate 有所帮助和 datasource添加协议(protocol)。