Manipulate YouTube Playlist API in tableview using Alamofire - ios

Question

I have searched around to find an answer for my issue, but I had no luck. I'm new in coding, especially with Swift 3.0.
I'm trying to parse a YouTube playlist dynamically in a tableview using Alamofire cocoa pod in my project. My project contains: a viewcontroller called "videosViewController" which holds the tableview, a class called "Video", which holds the items I'm parsing from youtube API, and another class called "VideoModel" holds the method to pare those items. When I run my project the console parse the items successfully, but then the project crashes at the line of code:
for video in (data["items"] as? NSDictionary)!
with "Could not cast value of type '__NSArrayI' (0x10d2ebd88) to 'NSDictionary' (0x10d2ec288)." error as shown below
Project crash
Console details
And here the snippet of code I used:
videosViewController:
import UIKit
class videosViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet var tableView: UITableView!
var videos:[Video] = [Video]()
var selectedVideo: Video?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let model = VideoModel()
model.fetchVideos()
self.tableView.dataSource = self
self.tableView.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return (self.view.frame.size.width / 320) * 180
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return videos.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "BasicCell")!
let videoTitle = videos[indexPath.row].videoTitle
let label = cell.viewWithTag(2) as! UILabel
label.text = videoTitle
let videoThumbnailUrlString = "https://i1.ytimg.com/vi/" + videos[indexPath.row].videoId + "/maxresdefault.jpg"
let videoThumbnailUrl = NSURL(string: videoThumbnailUrlString)
if videoThumbnailUrl != nil {
let request = URLRequest(url: videoThumbnailUrl! as URL)
let session = URLSession.shared
let task = session.dataTask(with: request,
completionHandler: { (data:Data?,
response:URLResponse?,
error:Error?) -> Void in
DispatchQueue.main.async {
let imageView = cell.viewWithTag(1) as! UIImageView
imageView.image = UIImage(data: data!)
}
})
task.resume()
}
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.selectedVideo = self.videos[indexPath.row]
self.performSegue(withIdentifier: "goToDetail", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let detailView = segue.destination as! videoDetailViewController
detailView.selectedVideo = self.selectedVideo
}
}
The Video class:
import UIKit
class Video: NSObject {
var videoId:String = ""
var videoTitle:String = ""
var videoDescription:String = ""
var videoThumbnailURL = ""
}
And the VideoModel class:
import UIKit
import Alamofire
class VideoModel: NSObject {
let parameters: Parameters = ["part":"snippet","playlistId":"PLMRqhzcHGw1ZRUB86rmNqG15Sr5jV-2NU","key":"AIzaSyDdNXhz3H7ifXB-qfOVakz0Xps2Y-kP0R0"]
var videoArray = [Video]()
func fetchVideos() {
Alamofire.request("https://www.googleapis.com/youtube/v3/playlistItems", method: .get, parameters: parameters, encoding: URLEncoding.default, headers: nil).responseJSON { (response:DataResponse<Any>) in
switch(response.result) {
case .success(let JSON):
print("Success with JSON: \(JSON)")
if let data = response.result.value as? [String: AnyObject] {
// print(response.result.value)
var arrayOfVideos = [Video]()
for video in (data["items"] as? NSDictionary)! {
let videoObj = Video()
videoObj.videoId = (video.value as? NSDictionary)?["snippet.resourceId.videoId"] as? String ?? ""
videoObj.videoTitle = (video.value as? NSDictionary)?["snippet.title"] as? String ?? ""
videoObj.videoDescription = (video.value as? NSDictionary)?["snippet.description"] as? String ?? ""
videoObj.videoThumbnailURL = (video.value as? NSDictionary)?["snippet.thumbnails.maxres.url"] as? String ?? ""
print(video)
// You need to parse the items into the video data
arrayOfVideos.append(videoObj)
}
self.videoArray = arrayOfVideos
// }
}
case .failure(let error):
print("Request failed with error: \(error)")
}
}
}

Answer 1

Replace
as? NSDictionary
with
as? [String:Any]
in
for video in (data["items"] as? NSDictionary)!
Bcs: You have to cast type Any to Swift dictionary type [String:Any].
if let JSON = response.result.value as? [String : Any] {
if let items = JSON["items"] as? [[String : Any]] {
for video in items {
//Other code
}
}
}