无法呈现 UISearchController [英] Unable to present a UISearchController

问题描述

我有以下视图层次结构:

 UINavigationController||\/LibraryTableViewController:UITableViewController||\/相册CollectionViewController:UICollectionViewController||\/SongsTableViewController: UITableViewController

我希望在 AlbumsCollectionViewController 中有一个搜索栏，而在 navigationItem.titleView 中显示的 SongsTableViewController 中有一个不同的搜索栏.>

我设法在 AlbumsCollectionViewController 中添加了一个有效的搜索栏，如下所示:

class AlbumsCollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout, UISearchControllerDelegate, UISearchResultsUpdating, UISearchBarDelegate {var searchController : UISearchController！覆盖 func viewDidLoad() {super.viewDidLoad()initSearchBar()initNavigationBar()}私有函数 initSearchBar() {self.searchController = UISearchController(searchResultsController: nil)self.searchController.searchResultsUpdater = selfself.searchController.delegate = selfself.searchController.searchBar.delegate = selfself.searchController.hidesNavigationBarDuringPresentation = falseself.searchController.dimsBackgroundDuringPresentation = falsesearchController.searchResultsController?.view.isHidden = falsesearchController.hidesNavigationBarDuringPresentation = falseself.extendedLayoutIncludesOpaqueBars = trueself.definesPresentationContext = truesearchController.searchBar.backgroundColor = UIColor.blackUIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).setTitleTextAttributes([NSAttributedStringKey.foregroundColor : UIColor.white], for: .normal)self.navigationItem.titleView = searchController.searchBarnavigationItem.titleView?.isHidden = true}私有函数 initNavigationBar() {searchButton.tintColor = UIColor.whitesettingsButton.tintColor = UIColor.whitebackButton.tintColor = UIColor.whiteself.navigationItem.title = "艺术家"self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.white]}@IBAction func SearchButtonTapped(_ sender: Any) {显示搜索栏()}私人功能 showSearchBar(){navigationItem.titleView?.isHidden = falsesearchController.isActive = 真}}

请注意，搜索栏隐藏在 ViewDidLoad() 上，并在按下按钮时显示，如 SearchButtonTapped 方法所示.

现在，我试图在 SongsTableViewController 中做同样的事情，但是，点击按钮时搜索栏没有显示(即调用 SearchButtonTapped)，我得到以下消息:

Warning: Attempt to present 在 <MyProject.AlbumsCollectionViewController: 0x7f81588023c0>其视图不在窗口层次结构中！

如果我评论了 searchController.isActive = true 行，那么搜索栏将显示，但是，即使我点击它也不会处于活动状态.

编辑

对不起，如果我没有说清楚.我在 SongsTableViewController 中有一个单独的 UISearchController.我的意思是我在两个控制器中使用相同的逻辑

另外请注意，如果我从导航控制器推送 SongsTableViewController(即视图层次结构只有 2 个控制器(UINavigationController => SongsTableViewController)，搜索栏工作正常

这是SongsTableViewController的大部分代码(省略不相关的东西)

导入 UIKit导入 os.log导入媒体播放器类 SongsTableViewController:UITableViewController、UISearchControllerDelegate、UISearchResultsUpdating、UISearchBarDelegate、PlayerDelegate、NowPlayingDelegate、SongCellDelegate、SongsOptionsDelegate {//标记:属性var playerManager:PlayerManager?= 零var 数据管理器:数据管理器?= 零var tabVC:TabBarController?var selectedSong:宋?惰性 var optionsTransitionDelegate = PresentationManager()懒惰 var playlistTransitionDelegate = PresentationManager()var searchController : UISearchController！@IBOutlet var backgroundView:UIView！@IBOutlet 弱 var searchButton: UIBarButtonItem！@IBOutlet 弱变量 settingsButton:UIBarButtonItem！var专辑ID:字符串?var 艺术家 ID:字符串?var 播放列表:播放列表?var song = [Song]()var songIndexMap = [String: Int]()varfilteredSongs = [Song]()覆盖 func viewDidLoad() {super.viewDidLoad()self.dataManager = DataManager.getInstance()self.playerManager = PlayerManager.getInstance()playlistTransitionDelegate.screenRatio = 2.0/3.0if(self.albumID != nil) {self.songs = SQLiteManager.getAlbumSongs(专辑ID:self.albumID！)} else if(self.artistID != nil) {self.songs = SQLiteManager.getArtistSongs(artistID: self.artistID!)} else if (self.playlist != nil) {self.songs = SQLiteManager.getPlaylistSongs(播放列表:self.playlist！)} 别的 {dataManager?.songsTableViewController = self}对于我在 0..<songs.count {SongIndexMap[songs[i].id] = i}initSearchBar()initNavigationBar()if(songs.count == 0 && (!fullListOfSongs() || fullListOfSongs() && dataManager?.getFullSongsCount() == 0)){tableView.backgroundView = backgroundView}tableView.tableFooterView = UIView()tabVC = tabBarController as?标签栏控制器tabVC?.nowPlayingViewController?.delegate = self}私有函数 shouldAutorotate() ->布尔{返回假}覆盖 func didReceiveMemoryWarning() {super.didReceiveMemoryWarning()}//MARK: - 表视图数据源覆盖 func numberOfSections(in tableView: UITableView) ->整数{返回 1}覆盖 func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) ->CGFloat {返回 Util.SONG_CELL_HEIGHT}覆盖 func tableView(_ tableView: UITableView, numberOfRowsInSection 部分: Int) ->整数{如果(isFiltering()){返回 self.filteredSongs.count} else if (fullListOfSongs()) {返回 dataManager!.getFullSongsCount()}返回 self.songs.count}覆盖 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) ->UITableViewCell {让 cellIdentifier = "SongTableViewCell"保护 let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as?SongCell 其他 {fatalError("出列的单元格不是 SongCell 的实例.")}var 歌:歌?如果(fullListOfSongs()){if(isFiltering()){歌曲 = self.filteredSongs[indexPath.row]} 别的 {Song = dataManager?.getSong(index: indexPath.row)}} 别的 {if(isFiltering()){歌曲 = self.filteredSongs[indexPath.row]} 别的 {歌曲 = self.songs[indexPath.row]}}cell.setAttributes(歌曲:歌曲！)cell.delegate = selfcell.preservesSuperviewLayoutMargins = false返回单元格}覆盖 func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){self.tableView.deselectRow(at: indexPath, 动画: false)}//MARK: - 搜索栏func updateSearchResults(for searchController: UISearchController) {如果(！searchController.isActive){隐藏搜索栏()tableView.reloadData()}if(isSearchBarEmpty()) {返回}filterSongs(过滤器:searchController.searchBar.text！)tableView.reloadData()}私人功能过滤器歌曲(过滤器:字符串){if(self.albumID != nil) {self.filteredSongs = SQLiteManager.getAlbumSongs(albumID: self.albumID!, filter: filter)} else if(self.artistID != nil) {self.filteredSongs = SQLiteManager.getArtistSongs(artistID: self.artistID!, filter: filter)} else if(self.playlist != nil) {self.filteredSongs = SQLiteManager.getPlaylistSongs(playlist: self.playlist!, filter: filter)}别的 {self.filteredSongs = SQLiteManager.getSongs(filter: filter)}}func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {如果搜索文本 == "" {tableView.reloadData()}}私有函数 initSearchBar() {self.searchController = UISearchController(searchResultsController: nil)self.searchController.searchResultsUpdater = selfself.searchController.delegate = selfself.searchController.searchBar.delegate = selfself.searchController.hidesNavigationBarDuringPresentation = falseself.searchController.dimsBackgroundDuringPresentation = falsesearchController.searchResultsController?.view.isHidden = falsesearchController.hidesNavigationBarDuringPresentation = falseself.extendedLayoutIncludesOpaqueBars = trueself.definesPresentationContext = truesearchController.searchBar.backgroundColor = UIColor.blackUIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).setTitleTextAttributes([NSAttributedStringKey.foregroundColor : UIColor.white], for: .normal)self.navigationItem.titleView = searchController.searchBarnavigationItem.titleView?.isHidden = true}私有函数 initNavigationBar() {searchButton.tintColor = UIColor.white如果(fullListOfSongs()){searchButton.isEnabled = falsedataManager?.buttons.append(searchButton)}settingsButton.tintColor = UIColor.whiteself.navigationItem.title = "歌曲"self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.white]}@IBAction func SearchButtonTapped(_ sender: Any) {显示搜索栏()}私人功能 showSearchBar(){self.navigationItem.titleView?.isHidden = falseself.searchController.isActive = trueDispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {self.searchController.searchBar.becomeFirstResponder()}navigationItem.rightBarButtonItems![0].isEnabled = falsenavigationItem.rightBarButtonItems![0].image = nilnavigationItem.rightBarButtonItems![1].isEnabled = falsenavigationItem.rightBarButtonItems![1].image = nil}私人功能隐藏搜索栏(){navigationItem.titleView?.isHidden = truenavigationItem.rightBarButtonItems![0].isEnabled = truenavigationItem.rightBarButtonItems![0].image = UIImage(named: "settings")navigationItem.rightBarButtonItems![1].isEnabled = truenavigationItem.rightBarButtonItems![1].image = UIImage(named: "search")}func isFiltering() ->布尔{如果(搜索控制器 == 零){返回假}返回 searchController.isActive &&!isSearchBarEmpty()}私有函数 isSearchBarEmpty() ->布尔{返回 searchController.searchBar.text?.isEmpty ??真的}私有函数 fullListOfSongs() ->布尔{返回 self.playlist == nil &&self.albumID == nil &&self.artistID == nil}}

解决方案

这在我测试时有效.我相信问题出在 SongsTableViewController:self.definesPresentationContext = false.对于推送的视图控制器，这应该是 true.(请参阅文档此处)

对于 SongsTableViewController(推送视图控制器)添加以下内容:

override func viewWillAppear(_animated: Bool) {super.viewWillAppear(动画)self.definesPresentationContext = true}

并将其添加到 AlbumsCollectionViewController(初始视图控制器):

override func viewWillDisappear(_animated: Bool) {super.viewWillDisappear(动画)self.definesPresentationContext = false}

I have the following view hierarchy:

                         UINavigationController
                                  ||
                                  \/
           LibraryTableViewController: UITableViewController
                                  ||
                                  \/
       AlbumsCollectionViewController: UICollectionViewController
                                  ||
                                  \/
             SongsTableViewController: UITableViewController

I want to have a search bar in AlbumsCollectionViewController and a different one in SongsTableViewController that is shown in the navigationItem.titleView.

I have managed to add a working search bar in AlbumsCollectionViewController as follows:

class AlbumsCollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout, UISearchControllerDelegate, UISearchResultsUpdating, UISearchBarDelegate {

    var searchController : UISearchController!

    override func viewDidLoad() {
        super.viewDidLoad()

        initSearchBar()
        initNavigationBar()
    }

    private func initSearchBar() {
        self.searchController = UISearchController(searchResultsController:  nil)

        self.searchController.searchResultsUpdater = self
        self.searchController.delegate = self
        self.searchController.searchBar.delegate = self

        self.searchController.hidesNavigationBarDuringPresentation = false
        self.searchController.dimsBackgroundDuringPresentation = false

        searchController.searchResultsController?.view.isHidden = false
        searchController.hidesNavigationBarDuringPresentation = false

        self.extendedLayoutIncludesOpaqueBars = true
        self.definesPresentationContext = true

        searchController.searchBar.backgroundColor = UIColor.black
        UIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).setTitleTextAttributes([NSAttributedStringKey.foregroundColor : UIColor.white], for: .normal)

        self.navigationItem.titleView = searchController.searchBar

        navigationItem.titleView?.isHidden = true
    }

    private func initNavigationBar() {
        searchButton.tintColor = UIColor.white
        settingsButton.tintColor = UIColor.white
        backButton.tintColor = UIColor.white
        self.navigationItem.title = "Artists"
        self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.white]
    }


    @IBAction func SearchButtonTapped(_ sender: Any) {
        showSearchBar()
    }


    private func showSearchBar(){
        navigationItem.titleView?.isHidden = false
        searchController.isActive = true
    }
}

Note that the search bar is hidden on ViewDidLoad() and is presented when a button is pressed as shown in SearchButtonTapped method.

Now, I am trying to do the same in SongsTableViewController however, the search bar is not showing when tapping the the button (i.e. calling SearchButtonTapped) and I am getting the following message:

Warning: Attempt to present <UISearchController: 0x7f8158812b50> on <MyProject.AlbumsCollectionViewController: 0x7f81588023c0> whose view is not in the window hierarchy!

If I commented the line searchController.isActive = true then the search bar will show, however, it wont be active even if I tapped on it.

Edit

Sorry if I haven't been clear. I have a separate UISearchController in SongsTableViewController. I meant I am using the same logic in both controllers

Also Note if I pushed SongsTableViewController from the navigation controller (i.e the view hierarchy only has 2 controllers (UINavigationController => SongsTableViewController) the search bar works fine

This is most of the Code of SongsTableViewController (omitted non relevant stuff)

import UIKit
import os.log
import MediaPlayer

class SongsTableViewController: UITableViewController, UISearchControllerDelegate, UISearchResultsUpdating, UISearchBarDelegate ,PlayerDelegate, NowPlayingDelegate, SongCellDelegate, SongsOptionsDelegate {

    // MARK: properties

    var playerManager: PlayerManager? = nil
    var dataManager: DataManager? = nil

    var tabVC: TabBarController?
    var selectedSong: Song?

    lazy var optionsTransitionDelegate = PresentationManager()
    lazy var playlistTransitionDelegate = PresentationManager()

    var searchController : UISearchController!

    @IBOutlet var backgroundView: UIView!
    @IBOutlet weak var searchButton: UIBarButtonItem!
    @IBOutlet weak var settingsButton: UIBarButtonItem!

    var albumID: String?
    var artistID: String?
    var playlist: Playlist?

    var songs = [Song]()
    var songIndexMap = [String: Int]()
    var filteredSongs = [Song]()


    override func viewDidLoad() {
        super.viewDidLoad()
        self.dataManager = DataManager.getInstance()
        self.playerManager = PlayerManager.getInstance()

        playlistTransitionDelegate.screenRatio = 2.0 / 3.0

        if(self.albumID != nil) {
            self.songs = SQLiteManager.getAlbumSongs(albumID: self.albumID!)
        } else if(self.artistID != nil) {
            self.songs = SQLiteManager.getArtistSongs(artistID: self.artistID!)
        } else if (self.playlist != nil) {
            self.songs = SQLiteManager.getPlaylistSongs(playlist: self.playlist!)
        } else {
            dataManager?.songsTableViewController = self
        }

        for i in 0..<songs.count {
            songIndexMap[songs[i].id] = i
        }

        initSearchBar()
        initNavigationBar()

        if(songs.count == 0 && (!fullListOfSongs() || fullListOfSongs() && dataManager?.getFullSongsCount() == 0)){
            tableView.backgroundView = backgroundView
        }
        tableView.tableFooterView = UIView()

        tabVC = tabBarController as? TabBarController
        tabVC?.nowPlayingViewController?.delegate = self


    }



    private func shouldAutorotate() -> Bool {
        return false
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return Util.SONG_CELL_HEIGHT
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if(isFiltering()) {
            return self.filteredSongs.count
        } else if (fullListOfSongs()) {
            return dataManager!.getFullSongsCount()
        }
        return self.songs.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cellIdentifier = "SongTableViewCell"
        guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? SongCell  else {
            fatalError("The dequeued cell is not an instance of SongCell.")
        }
        var song: Song?
        if(fullListOfSongs()) {
            if(isFiltering()){
                song = self.filteredSongs[indexPath.row]
            } else {
                song = dataManager?.getSong(index: indexPath.row)
            }
        } else {
            if(isFiltering()){
                song = self.filteredSongs[indexPath.row]
            } else {
                song = self.songs[indexPath.row]
            }
        }

        cell.setAttributes(song: song!)
        cell.delegate = self

        cell.preservesSuperviewLayoutMargins = false
        return cell
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
        self.tableView.deselectRow(at: indexPath, animated: false)
    }



    // MARK: - Search Bar

    func updateSearchResults(for searchController: UISearchController) {
        if (!searchController.isActive) {
            hideSearchBar()
            tableView.reloadData()
        }

        if(isSearchBarEmpty()) {
            return
        }

        filterSongs(filter: searchController.searchBar.text!)
        tableView.reloadData()
    }

    private func filterSongs(filter: String) {
        if(self.albumID != nil) {
            self.filteredSongs = SQLiteManager.getAlbumSongs(albumID: self.albumID!, filter: filter)
        } else if(self.artistID != nil) {
            self.filteredSongs = SQLiteManager.getArtistSongs(artistID: self.artistID!, filter: filter)
        } else if(self.playlist != nil) {
            self.filteredSongs = SQLiteManager.getPlaylistSongs(playlist: self.playlist!, filter: filter)
        }else {
            self.filteredSongs = SQLiteManager.getSongs(filter: filter)
        }
    }

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        if searchText == "" {
            tableView.reloadData()
        }
    }


    private func initSearchBar() {
        self.searchController = UISearchController(searchResultsController:  nil)

        self.searchController.searchResultsUpdater = self
        self.searchController.delegate = self
        self.searchController.searchBar.delegate = self

        self.searchController.hidesNavigationBarDuringPresentation = false
        self.searchController.dimsBackgroundDuringPresentation = false

        searchController.searchResultsController?.view.isHidden = false
        searchController.hidesNavigationBarDuringPresentation = false

        self.extendedLayoutIncludesOpaqueBars = true
        self.definesPresentationContext = true

        searchController.searchBar.backgroundColor = UIColor.black
        UIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).setTitleTextAttributes([NSAttributedStringKey.foregroundColor : UIColor.white], for: .normal)

        self.navigationItem.titleView = searchController.searchBar

        navigationItem.titleView?.isHidden = true
    }


    private func initNavigationBar() {
        searchButton.tintColor = UIColor.white
        if (fullListOfSongs()) {
            searchButton.isEnabled = false
            dataManager?.buttons.append(searchButton)
        }
        settingsButton.tintColor = UIColor.white
        self.navigationItem.title = "Songs"
        self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.white]
    }


    @IBAction func SearchButtonTapped(_ sender: Any) {
        showSearchBar()
    }


    private func showSearchBar(){
        self.navigationItem.titleView?.isHidden = false
        self.searchController.isActive = true

        DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
            self.searchController.searchBar.becomeFirstResponder()
        }

        navigationItem.rightBarButtonItems![0].isEnabled = false
        navigationItem.rightBarButtonItems![0].image = nil
        navigationItem.rightBarButtonItems![1].isEnabled = false
        navigationItem.rightBarButtonItems![1].image = nil
    }

    private func hideSearchBar() {
        navigationItem.titleView?.isHidden = true

        navigationItem.rightBarButtonItems![0].isEnabled = true
        navigationItem.rightBarButtonItems![0].image = UIImage(named: "settings")
        navigationItem.rightBarButtonItems![1].isEnabled = true
        navigationItem.rightBarButtonItems![1].image = UIImage(named: "search")

    }

    func isFiltering() -> Bool {
        if(searchController == nil){
            return false
        }
        return searchController.isActive && !isSearchBarEmpty()
    }

    private func isSearchBarEmpty() -> Bool {
        return searchController.searchBar.text?.isEmpty ?? true
    }

    private func fullListOfSongs() -> Bool {
        return self.playlist == nil && self.albumID == nil && self.artistID == nil
    }

}

解决方案

This worked when I tested. I believe the problem is in SongsTableViewController: self.definesPresentationContext = false. This should be true for the pushed View Controller. (see docs here)

For SongsTableViewController (pushed view controller) add the following:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    self.definesPresentationContext = true
}

And add this to AlbumsCollectionViewController (initial view controller):

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    self.definesPresentationContext = false
}

这篇关于无法呈现 UISearchController的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！