Swift 3の動画を解析しても結果が表示されず、ロードされ続ける - IOS 10

Question

私はjsonの解析でYouTubeチャンネルと動画を取得しようとしていますが、私はSwift 3を初めて使っています。消えて、結果は表示されず、ログにエラーはありません。

これは私のコードである：getVideosForChannelAtIndex FUNC

1 /：

func getVideosForChannelAtIndex(_ index: Int!) { 

    let playlistID = channelsDataArray[index]["playlistID"] as! String 
    let urlString = "https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&playlistId=\(playlistID)&key=\(apiKey)" 
    let targetURL = URL(string: urlString) 
    var url = URLRequest(url: targetURL!) 
    url.httpMethod = "GET" 
    URLSession.shared.dataTask(with: url) { (data, response, error) in 
     let httpStatus = response as? HTTPURLResponse 

     if httpStatus!.statusCode == 200 && error != nil { 



      do { 
       let resultsDict = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! Dictionary<String, AnyObject> 

       let items: Array<Dictionary<String, AnyObject>> = resultsDict["items"] as! Array<Dictionary<String, AnyObject>> 

       for i in 0 ..< items.count { 
        let playlistSnippetDict = (items[i] as Dictionary<String, AnyObject>)["snippet"] as! Dictionary<String, AnyObject> 

        var desiredPlaylistItemDataDict = Dictionary<String, AnyObject>() 

        desiredPlaylistItemDataDict["title"] = playlistSnippetDict["title"] 
        desiredPlaylistItemDataDict["thumbnail"] = ((playlistSnippetDict["thumbnails"] as! Dictionary<String, AnyObject>)["default"] as! Dictionary<String, AnyObject>)["url"] 
        desiredPlaylistItemDataDict["videoID"] = (playlistSnippetDict["resourceId"] as! Dictionary<String, AnyObject>)["videoId"] 

        self.videosArray.append(desiredPlaylistItemDataDict) 

        self.tableView.reloadData() 
       } 
      } catch { 
       print(error) 
      } 
     } 
     else { 
      print("Error while loading channel videos: \(error)") 
     } 

     self.activityView.isHidden = true 
    } 



     } 

2/FUNC getChannelDetails：

func getChannelDetails(_ useChannelIDParam: Bool) { 

    var urlString: String! 

    if !useChannelIDParam { 
     urlString = "https://www.googleapis.com/youtube/v3/channels?part=contentDetails,snippet&forUsername=\(desiredChannelsArray[channelIndex])&key=\(apiKey)" 
    } 
    else { 
     urlString = "https://www.googleapis.com/youtube/v3/channels?part=contentDetails,snippet&id=\(desiredChannelsArray[channelIndex])&key=\(apiKey)" 
    } 

    let targetURL = URL(string: urlString) 
    var request = URLRequest(url: targetURL!) 
    request.httpMethod = "GET" 
    URLSession.shared.dataTask(with: request) { (data, response, error) in 
     let httpStatus = response as? HTTPURLResponse 

     if httpStatus!.statusCode == 200 && error != nil { 



      do { 
       let resultsDict = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! Dictionary<String, AnyObject> 

       let items: AnyObject! = resultsDict["items"] as AnyObject! 
       let firstItemDict = (items as! Array<AnyObject>)[0] as! Dictionary<String, AnyObject> 

       let snippetDict = firstItemDict["snippet"] as! Dictionary<String, AnyObject> 

       var desiredValuesDict: Dictionary<String, AnyObject> = Dictionary<String, AnyObject>() 
       desiredValuesDict["title"] = snippetDict["title"] 
       desiredValuesDict["description"] = snippetDict["description"] 
       desiredValuesDict["thumbnail"] = ((snippetDict["thumbnails"] as! Dictionary<String, AnyObject>)["default"] as! Dictionary<String, AnyObject>)["url"] 

       desiredValuesDict["playlistID"] = ((firstItemDict["contentDetails"] as! Dictionary<String, AnyObject>)["relatedPlaylists"] as! Dictionary<String, AnyObject>)["uploads"] 


       self.channelsDataArray.append(desiredValuesDict) 


       self.tableView.reloadData() 

       self.channelIndex += 1 
       if self.channelIndex < self.desiredChannelsArray.count { 
        self.getChannelDetails(useChannelIDParam) 
       } 
       else { 
        self.activityView.isHidden = true 
       } 
      } catch { 
       print(error) 
      } 

     } else { 
      print("Error while loading channel details: \(error)") 
     } 
    } 



    } 


    } 

3/FUNC textFieldShouldReturn：

func textFieldShouldReturn(_ textField: UITextField) -> Bool { 

    textField.resignFirstResponder() 
    activityView.isHidden = false 

    var type = "channel" 
    if segmentDisplay.selectedSegmentIndex == 1 { 

    type = "video" 
     videosArray.removeAll(keepingCapacity: false) 

    } 
    var urlString = "https://www.googleapis.com/youtube/v3/search?part=snippet&q=\(textField.text)&type=\(type)&key=\(apiKey)" 

    urlString = urlString.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed)! 



    let targetURL = URL(string: urlString) 

    var request = URLRequest(url: targetURL!) 
    request.httpMethod = "GET" 

URLSession.shared.dataTask(with: request) { (data, response, error) in 
let httpStatus = response as? HTTPURLResponse 
if httpStatus!.statusCode == 200 && error != nil { 


    do { 
     let resultsDict = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! Dictionary<String, AnyObject> 

     let items: Array<Dictionary<String, AnyObject>> = resultsDict["items"] as! Array<Dictionary<String, AnyObject>> 

     for i in 0 ..< items.count { 
      let snippetDict = items[i]["snippet"] as! Dictionary<String, AnyObject> 

      if self.segmentDisplay.selectedSegmentIndex == 0 { 
       self.desiredChannelsArray.append(snippetDict["channelId"] as! String) 
      } 
      else { 
       var videoDetailsDict = Dictionary<String, AnyObject>() 
       videoDetailsDict["title"] = snippetDict["title"] 
       videoDetailsDict["thumbnail"] = ((snippetDict["thumbnails"] as! Dictionary<String, AnyObject>)["default"] as! Dictionary<String, AnyObject>)["url"] 
       videoDetailsDict["videoID"] = (items[i]["id"] as! Dictionary<String, AnyObject>)["videoId"] 

       self.videosArray.append(videoDetailsDict) 

       self.tableView.reloadData() 
      } 
     } 
    } catch { 
     print(error) 
    } 

    if self.segmentDisplay.selectedSegmentIndex == 0 { 
     self.getChannelDetails(true) 
    } 

} 
else { 
    print("Error while loading channel videos: \(error)") 
} 

self.activityView.isHidden = true 
    } 


    return true 


} 

Answer 1

としてmコメントには、URLSessionのすべてのタスクがデフォルトで中断されているため、各タスクでresume()と呼ぶ必要があります。 URLRequestインスタンスは全く必要ありませんちなみに

URLSession.shared.dataTask(with: request) { (data, response, error) in 

    ... 

}.resume() 

また

let task = URLSession.shared.dataTask(with: request) { (data, response, error) in 

    ... 

} 
task.resume() 

：あなたのワンライナーこの方法を使用して

。 GETがデフォルトのHTTPメソッドです。

注：文字列補間を使用するURLに埋め込まれているすべてのオプション値がアンラップされていることを確認してください。そうでない場合は、文字列Optional("Foo")が返されます。たとえば、3番目のコードスニペットのtextField.textは間違いなくオプションです。