Question

我花了很多时间才找到解决方案，但我没找到，所以我在这里请求帮助。

我有一个带按钮的ViewController，当我按下这个按钮时，searchController会出现一个searchBar，当我开始在searchBar中输入一个字母时，tableViewController的tableView出现在主视图上方和searchController下方。但是tableView的单元格上没有出现结果，因为没有调用cellForRowAt indexPath方法。

以下代码适用于ViewController：

class ViewController: UIViewController, UISearchControllerDelegate, UISearchBarDelegate {
var tableViewSearch: TableViewController!

lazy var searchController: UISearchController = {
    let sc = UISearchController(searchResultsController: self.tableViewSearch)
    sc.searchResultsUpdater = self.tableViewSearch
    sc.delegate = self
    sc.searchBar.delegate = self
    return sc
}()

override func viewDidAppear(_ animated: Bool) {
    tableViewSearch = TableViewController()
}

@IBAction func searchWithAddress(_ sender: AnyObject) {
    self.present(searchController, animated: true, completion: nil)
}
}

以下代码是TableViewController：

class TableViewController: UITableViewController, UISearchResultsUpdating {
var userTab = [String]()
var filteredUsers = [String]()
var searchController: UISearchController!
var resultsController = UITableViewController()
var name: String!
var ref: DatabaseReference!

override func viewDidLoad() {
    super.viewDidLoad()
    self.resultsController.tableView.delegate = self
    self.resultsController.tableView.dataSource = self
    ref = Database.database().reference()

    ref.child("users").queryOrdered(byChild: "pseudo").observeSingleEvent(of: .value, with: { (snapshot) in
        self.userTab = []
            for child in snapshot.children {
                let userSnap = child as! DataSnapshot
                let uid = userSnap.key
                let userDict = userSnap.value as! [String: AnyObject]
                let pseudo = userDict["pseudo"] as! String
                self.userTab.append(pseudo)
                self.resultsController.tableView.reloadData()
                continue
            }
        }
    })
}

func updateSearchResults(for searchController: UISearchController) {
    print("updateSearchResults")
    self.filteredUsers = self.userTab.filter { (user:String) -> Bool in
        if user.lowercased().contains(searchController.searchBar.text!.lowercased()) {
            return true
        } else {
            return false
        }
    }
    self.resultsController.tableView.reloadData()
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    print("prepare")
    if segue.identifier == "userProfil" {
        let userViewController = segue.destination as! UserViewController
        userViewController.pseudo = self.name!
    }
}

// Number of rows isn't equal to 0
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if tableView == self.tableView {
        return self.userTab.count
    } else {
        return self.filteredUsers.count
    }
}

// This method is never called
override func tableView(_ tableView: UITableView!, cellForRowAt indexPath: IndexPath!) -> UITableViewCell {
    print("cellForRowAt") // This line is never printed on the console
    let cell = UITableViewCell()
    if tableView == self.tableView {
        cell.textLabel?.text = self.userTab[indexPath.row]
    } else {
        cell.textLabel?.text = self.filteredUsers[indexPath.row]
    }
    return cell
}

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let post = filteredUsers[indexPath.row] as! String
    self.name = post
    performSegue(withIdentifier: "userProfil", sender: nil)
}
}

为什么不调用cellForRowAt indexPath方法？我的代码有什么问题？

当searchBar开始输入时，TableView的cellForRowAt indexPath方法在searchController中没有被调用

0 个答案: