我无法访问json响应Swift 4中的值

Question

我正在尝试使用youtube api将特定youtube频道的所有视频显示到tableViewController上。当我打印结果时，我在控制台中收到了我需要的所有信息，但我不知道如何访问结果中的值。

import UIKit
struct VideoInfo : Codable {
struct First : Codable {
let kind: String
}
struct Items : Codable {
let id: String
let snippet: Snippet
}
struct Snippet: Codable {
//let title: String?
let resourceId: ResourceId
let thumbnails: Thumbnails
let title: String
enum CodingKeys: String, CodingKey {
case title
case resourceId
case thumbnails
}
}
struct Thumbnails: Codable {
let high: High
}
struct High: Codable {
let url: String
enum CodingKeys: String, CodingKey {
case url
}
}
struct ResourceId : Codable {
let videoId: String
enum CodingKeys: String, CodingKey {
case videoId
}
}
let items: [Items]
}

class FirstView: UIViewController, UITableViewDelegate, UITableViewDataSource {
var fawxData = [FawxData]()
@IBAction func topSongsPressed(_ sender: Any) {
print("title.rawvalue (VideoInfo.Snippet.CodingKeys.title.rawValue)")
}
@IBOutlet weak var tableView: UITableView!
let urlTest = "<iframe width="560" height="315" src="https://www.youtube.com/embed/huFx61WPfsc" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>"
override func viewDidLoad() {
super.viewDidLoad()
let fA1 = FawxData(imageUrl: "https://img.youtube.com/vi/huFx61WPfsc/hqdefault.jpg", videoURL: "huFx61WPfsc", videoTitle: "Seven Nation Army Cover")
let fA2 = FawxData(imageUrl: "https://img.youtube.com/vi/0GS61L1CMfU/hqdefault.jpg", videoURL: "0GS61L1CMfU", videoTitle: "Powerful")
let fA3 = FawxData(imageUrl: "https://img.youtube.com/vi/Eyzov4pdap8/hqdefault.jpg", videoURL: "Eyzov4pdap8", videoTitle: "Trees")
// let fA4 = FawxData(imageUrl: VideoInfo.High.CodingKeys.url.rawValue, videoURL: VideoInfo.ResourceId.CodingKeys.videoId.rawValue, videoTitle: VideoInfo.Snippet.CodingKeys.title.rawValue)
fawxData.append(fA1)
fawxData.append(fA2)
fawxData.append(fA3)
//fawxData.append(fA4)
tableView.delegate = self
tableView.dataSource = self
print(fawxData.count)
let youtubeApi = "https://www.googleapis.com/youtube/v3/playlistItems?playlistId=UU7wZwtAK1TYmFSkNBz3E_3A&key=**********************&part=snippet&maxResults=50"
guard let url = URL(string: youtubeApi) else
{return}
// Creating request
URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let data = data else {return}
do {
let videoInfo = try JSONDecoder().decode(VideoInfo.self, from: data)
print("Video.self = (videoInfo.self)")

}
catch {
print("json error: (error)")
}
}
.resume()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return fawxData.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "fawxCell", for: indexPath) as? FawxCell{
let selectedInfo = fawxData[indexPath.row]
cell.updateUI(fawxData: selectedInfo)
tableView.rowHeight = 100
return cell
}else{
return UITableViewCell()
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let videoInfo = fawxData[indexPath.row]
performSegue(withIdentifier: "PlayVideo", sender: videoInfo)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
if segue.identifier == "PlayVideo"{
if tableView.indexPathForSelectedRow != nil{
if let navigationContoller = segue.destination as? VideoVC{
let destVC = navigationContoller
//Getting selected videoInfo
let myIndexPath = self.tableView.indexPathForSelectedRow!
let row = myIndexPath.row
//Passing selected video to detail view
destVC.videoPassed = fawxData[row].videoUrl
}
}
}
}
}

这是控制台输出：

Video.self=视频信息(项目：[Fawx_Music_App.VideoInfo.items(id："VVU3d1p3dEFLMVRZbUZTa05CejNFXzNBLjBHUzYxTDFDTWZV"，代码段：Fawx_Music_App.VideoInfo.Sippet(资源id：Fawx_Music_App.VideoInfo.resourceId(视频id："0GS61L1CMfU")，缩略图：Faw_xMusic_Aapp.VideoInfo缩略图(high:Fawx_Music_App.WideoInfo.high(url："https://i.ytimg.com/vi/0GS61L1CMfU/hqdefault.jpg))，标题："FAWX-强大")，FAWX_Music_App.VideoInfo.Items(id:"VVU3d1p3dEFLMVRZbUZTa05CejNFXzNBLmh1Rng2MVdQZnNj"，片段：FAWX_Music_App.VideoInfo.Sippet(资源id:FAWX_Music _App.VideoInfo.resourceId(视频id:"huFx61WPfsc")，缩略图：FAWX_Music_App/VideoInfo.Thumbnail(高：FAWX-Music_App.VideoInfo.high(url:"https://i.ytimg.com/vi/huFx61WPfsc/hqdefault.jpg)，标题："一汽音乐七国集团军

Answer 1

请尝试：

URLSession.shared.dataTask(with: url) { [weak self] (data, response, error) in
....
self?.fawxData.removeAll() //if loadmore just remove this method
let displayData = videoInfo.items.map ({
FawxData(imageUrl: $0.snippet.resourceId.thumbnails.high.url, videoURL: $0.snippet.resourceId.videoId, videoTitle: $0.snippet.resourceId.thumbnails.high.title)
})
self?.fawxData.append(contentsOf: displayData)
self?.tableView.reloadData()
....