searchBar 过滤 tableViewCells didSelectItemAt indexPath 显示在 navigationBar Title

Question

enter image description here我在从 searchBar 过滤的 tableView 单元格中实现 didSelectRowAtIndexPath 时遇到问题。当我根据搜索栏 textDidChange 更新 tableView 列表，并对另一个 ViewController 执行 show segue 时，navigationBar Title 始终显示未过滤的 tableViews indexPath 0。换句话说，我想让导航标题显示来自的文本搜索结果 tableView 的 didSelectAtIndex （不是来自未过滤的 tableView 的原始 indexPath 单元格文本）。希望这是有道理的，并提前感谢！

// viewDidLoad method
    override func viewDidLoad() {
        super.viewDidLoad()

        searchBar.searchBarStyle = UISearchBarStyle.prominent
        searchBar.placeholder = " Search Places..."
        searchBar.sizeToFit()
        searchBar.isTranslucent = false
        searchBar.backgroundImage = UIImage()
        searchBar.delegate = self
        searchBar.returnKeyType = UIReturnKeyType.done
        navigationItem.titleView = searchBar

        ref = FIRDatabase.database().reference()
        fetchPlaces()

        placesClient = GMSPlacesClient.shared()
        locationManager.requestAlwaysAuthorization()

        tableView.allowsMultipleSelectionDuringEditing = true

    }

    var placeList = [Place]()
    var placesDictionary = [String: Place]()

    // fetch places for tableView method
    func fetchPlaces() {
        let uid = FIRAuth.auth()?.currentUser?.uid
        let ref = FIRDatabase.database().reference().child("users").child(uid!).child("Places")
        ref.observe(.childAdded, with: { (snapshot) in
            if let dictionary = snapshot.value as? [String: AnyObject] {
                let place = Place()
                place.setValuesForKeys(dictionary)

                if let addedBy = place.addedBy {
                    self.placesDictionary[addedBy] = place
                    self.placeList.insert(place, at: 0)
                }
                //this will crash because of background thread, so lets call this on dispatch_async main thread
                DispatchQueue.main.async(execute: {
                    self.tableView.reloadData()
                })
            }  
        }, withCancel: nil)
    }

    // search variables
        lazy var searchBar:UISearchBar = UISearchBar()
        var isSearching = false
        var filteredData = [Place]()

    // searchBar method
        func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
            if searchBar.text == nil || searchBar.text == "" {
                isSearching = false
                view.endEditing(true)
                tableView.reloadData()
            } else {
                isSearching = true
                filteredData = placeList.filter({$0.place?.range(of: searchBar.text!) != nil})
                tableView.reloadData()
            }
        }

    // tableView methods
        override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            if isSearching {
                return filteredData.count
            }
            return placeList.count
        }

        override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let cell = UITableViewCell(style: .subtitle, reuseIdentifier: cellId)
            if isSearching {
                cell.textLabel?.text = filteredData[indexPath.row].place
            } else {
            cell.textLabel?.text = placeList[indexPath.row].place
            }
            return cell
        }

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let placeDetailsVC = CurrentUserPlaceDetailsVC()
    if isSearching == false {
    placeDetailsVC.navigationTitle = placeList[(indexPath.row)].place
    show(placeDetailsVC, sender: self)
    } else {
        placeDetailsVC.navigationTitle = filteredData[(indexPath.row)].place
        show(placeDetailsVC, sender: self)
        }
    }
} 

Answer 1

在即将到来的 ViewController 中创建一个字符串。

class CurrentUserPlaceDetailsVC: UIViewController {
    var navigationTitle: String?

    override func viewDidLoad(){
        super.viewDidLoad()
        self.navigationItem.title = navigationTitle
    }
}

现在，与其将标题直接分配给 navigationBar，不如先将其分配给该字符串，然后再分配给 viewController 的 viewDidLoad 方法中的 navigationBar。

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let placeDetailsVC = CurrentUserPlaceDetailsVC()
        // Get Cell Label
        placeDetailsVC.navigationTitle = placeList[indexPath.row].place
        show(placeDetailsVC, sender: self)

    }