SearchControllerを使用して検索中にタブバーを使用すると黒い画面になる

Question

ナビゲーションコントローラーにタブバーコントローラーが組み込まれたアプリがあります。アプリには2つのタブがあり、最初のもの（検索）にはUISearchControllerを使って実装された検索バーがあります。私が探してる間、私はこのタブから、他のタブ（ダウンロード）に切り替えると、他のタブに二つのことが起こる - 私が来るときに2つ目のタブ（ダウンロード）で

• ナビゲーションバーは
• を消えますバック最初のタブ（検索）に、それは私がストーリーボードを使用して、このすべてを行っている

黒い画面が表示されます。

は、これが私のSearchViewController

import UIKit 
import Alamofire 
import SwiftyJSON 

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchResultsUpdating, UISearchBarDelegate{ 

    //MARK: Variables 
    var papers = [Paper]() 
    var filteredPapers = [Paper]() 
    let searchController = UISearchController(searchResultsController: nil) 

    // MARK: Outlets 
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView! 
    @IBOutlet var table: UITableView! 
    @IBOutlet weak var loadingMessageLabel: UILabel! 
    @IBOutlet weak var retryButton: UIButton! 

    //MARK: Actions 
    @IBAction func retryButton(sender: UIButton) { 
     self.loadingMessageLabel.hidden = false 
     self.loadingMessageLabel.text = "While the satellite moves into position..." 
     self.activityIndicator.hidden = false 
     self.activityIndicator.startAnimating() 
     self.retryButton.hidden = true 
     self.getPapersData() 

    } 

    // MARK: Table View 

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     // If in searching mode, then return the number of results else return the total number 
//  if searchController.active && searchController.searchBar.text != "" { 
     if searchController.active { 
      return filteredPapers.count 
     } 
     return papers.count 
    } 

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 

     let paper: Paper 

//  if searchController.active && searchController.searchBar.text != "" { 
     if searchController.active { 
      paper = filteredPapers[indexPath.row] 
     } else { 
      paper = papers[indexPath.row] 
     } 

     if let cell = self.table.dequeueReusableCellWithIdentifier("Cell") as? PapersTableCell { 

      cell.initCell(paper.name, detail: paper.detail) 
      print(cell) 
      return cell 
     } 

     return PapersTableCell() 

    } 

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { 
    } 

    func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [UITableViewRowAction]? { 


     let downloadButton = UITableViewRowAction(style: .Normal, title: "Download") { action, index in 

      var url = String(self.papers[indexPath.row].url) 
      url = url.stringByReplacingOccurrencesOfString(" ", withString: "%20") 
      print(url) 
      let destination = Alamofire.Request.suggestedDownloadDestination(directory: .DocumentDirectory, domain: .UserDomainMask) 

      // Spinner in cell 

      //   var selectCell = self.table.cellForRowAtIndexPath(indexPath) as? PapersTableCell 
      //   selectCell!.downloadSpinner.hidden = false 

      // Dismiss the download button 
      self.table.editing = false 

      Alamofire.download(.GET, url, destination: destination).response { _, _, _, error in 
       if let error = error { 
        print("Failed with error: \(error)") 
       } else { 
        print("Downloaded file successfully") 
       } 
       //    selectCell?.downloadSpinner.hidden = true 
      } 

     } 

     downloadButton.backgroundColor = UIColor(red:0.30, green:0.85, blue:0.39, alpha:1.0) 


     return [downloadButton] 

    } 

    func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool { 
     // the cells you would like the actions to appear needs to be editable 
     return true 
    } 

    func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) { 
     // you need to implement this method too or you can't swipe to display the actions 
    } 

    // MARK: Search 

    func filterContentForSearchText(searchText: String, scope: String = "All") { 
     filteredPapers = papers.filter { paper in 
      let categoryMatch = (scope == "All") || (paper.exam == scope) 
      return categoryMatch && paper.name.lowercaseString.containsString(searchText.lowercaseString) 
     } 

     table.reloadData() 
    } 

    func updateSearchResultsForSearchController(searchController: UISearchController) { 
     let searchBar = searchController.searchBar 
     let scope = searchBar.scopeButtonTitles![searchBar.selectedScopeButtonIndex] 
     filterContentForSearchText(searchController.searchBar.text!, scope: scope) 

    } 

    func searchBar(searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) { 
     filterContentForSearchText(searchBar.text!, scope: searchBar.scopeButtonTitles![selectedScope]) 
    } 

    // MARK: Defaults 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     self.getPapersData() 

     searchController.searchResultsUpdater = self 
     searchController.dimsBackgroundDuringPresentation = false 
     definesPresentationContext = true 
     table.tableHeaderView = searchController.searchBar 
     searchController.searchBar.scopeButtonTitles = ["All", "ST1", "ST2", "PUT", "UT"] 
     searchController.searchBar.delegate = self 
     activityIndicator.startAnimating() 


    } 

    override func viewWillDisappear(animated: Bool) { 
//  if searchController.active { 
      self.searchController.resignFirstResponder() 
//  } 
    } 





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

    // MARK: API call 

    func getPapersData(){ 
     Alamofire.request(.GET, "http://silive.in/bytepad/rest/api/paper/getallpapers?query=") 
      .responseJSON { response in 

       self.activityIndicator.stopAnimating() 
       self.activityIndicator.hidden = true 

       // If the network works fine 
       if response.result.isFailure != true { 

        self.loadingMessageLabel.hidden = true 
        self.table.hidden = false 
        //print(response.result) // result of response serialization 

        let json = JSON(response.result.value!) 

        for item in json { 
         // Split the title on the . to remove the extention 
         let title = item.1["Title"].string!.characters.split(".").map(String.init)[0] 
         let category = item.1["ExamCategory"].string 
         let url = item.1["URL"].string 
         let detail = item.1["PaperCategory"].string 

         let paper = Paper(name: title, exam: category!, url: url!, detail: detail!) 
         self.papers.append(paper) 

        } 
        self.table.reloadData() 

       } 
        // If the network fails 
       else { 
        self.retryButton.hidden = false 
        self.loadingMessageLabel.text = "Check your internet connectivity" 
       } 

     } 
    } 


} 

であり、これは

import UIKit 
import QuickLook 

class DownloadViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, QLPreviewControllerDataSource { 

    var items = [(name:String, url:String)]() 

    @IBOutlet weak var downloadsTable: UITableView! 

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return items.count 
    } 

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { 

     print(items[indexPath.row].url) 

//  performSegueWithIdentifier("DocumentViewSegue", sender: items[indexPath.row].url) 

     let previewQL = QLPreviewController() // 4 
     previewQL.dataSource = self // 5 
     previewQL.currentPreviewItemIndex = indexPath.row // 6 
     showViewController(previewQL, sender: nil) // 7 

    } 

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 

     if let cell = self.downloadsTable.dequeueReusableCellWithIdentifier("Download Cell") as? DownloadsTableCell { 

      cell.initCell(items[indexPath.row].name, detail: "", fileURL: items[indexPath.row].url) 

      return cell 
     } 

     return DownloadsTableCell() 

    } 

    func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) { 
     if editingStyle == UITableViewCellEditingStyle.Delete { 

//   let fileManager = NSFileManager.defaultManager() 
//    
//   // Delete 'hello.swift' file 
//    
//   do { 
//    try fileManager.removeItemAtPath(String(items[indexPath.row].url)) 
//   } 
//   catch let error as NSError { 
//    print("Ooops! Something went wrong: \(error)") 
//   } 

      items.removeAtIndex(indexPath.row) 
      tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic) 
     } 
    } 


    override func viewDidAppear(animated: Bool) { 

     items.removeAll() 

     let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first! 

     // now lets get the directory contents (including folders) 
     do { 
      let directoryContents = try NSFileManager.defaultManager().contentsOfDirectoryAtURL(documentsUrl, includingPropertiesForKeys: nil, options: NSDirectoryEnumerationOptions()) 
//   print(directoryContents) 

      for var file in directoryContents { 
       print(file.lastPathComponent) 
       print(file.absoluteURL) 

       // Save the data in the list as a tuple 
       self.items.append((file.lastPathComponent!, file.absoluteString)) 
      } 

     } catch let error as NSError { 
      print(error.localizedDescription) 
     } 

     downloadsTable.reloadData() 
    } 

    // MARK: Preview 

    func numberOfPreviewItemsInPreviewController(controller: QLPreviewController) -> Int { 
     return items.count 
    } 

    func previewController(controller: QLPreviewController, previewItemAtIndex index: Int) -> QLPreviewItem { 
     return NSURL(string: items[index].url)! 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 


     // Do any additional setup after loading the view. 


    } 

    override func viewWillAppear(animated: Bool) { 
     //do something 

     super.viewWillAppear(true) 


    } 

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


    /* 
    // MARK: - Navigation 

    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
     // Get the new view controller using segue.destinationViewController. 
     // Pass the selected object to the new view controller. 
    } 
    */ 


} 

Answer 1

があなたのUISearchControllerがビュー階層から削除されるために装着されているビューのように見える私のDownloadViewControllerです。 UISearchControllerは、検索を開始するとモーダルに表示されると考えることができ、definesPresentationContextプロパティは、UIViewControllerがそれを提示するもの（more on this）を示します。

各タブがUINavigationController独自のを持っているように、この問題を解決する方法の1つは、（場合には、あなたが両方のためにそれを必要とする）あなたのストーリーボードを再構成することになります。

の代わりに（私はあなたが今持っている疑いがあるものを） ：

そして、あなたは、タブスイッチは、ViewControllerにこのオーバーライドを追加するときUISearchControllerを却下する場合：

override func viewWillDisappear(animated: Bool) { 
    super.viewWillDisappear(animated) 
    searchController.active = false 
}