Passing data from JSON to table view cell in Swift 3 - ios

Question

I'm trying to pass data from a JSON response to a table view cell. I'm having problems with capturing the response values that I'm extracting in URLSession.shared.dataTask.
func callYouTubeAPIToGetAllVideos() {
let url = URL(string: "https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=XYZ&maxResults=50&order=date&key=ABC")
let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
if error != nil {
print(error!)
} else {
if let usableData = data {
let json = try? JSONSerialization.jsonObject(with: usableData, options: [])
if let dictionary = json as? [String: Any?] {
if let array = dictionary["items"] as? [Any] {
for object in array {
if let objectAsDictionary = object as? [String: Any?] {
if let objectWithKindAndVideoId = objectAsDictionary["id"] as? [String: String] {
if let videoId = objectWithKindAndVideoId["videoId"] {
//pass data to table cell
}
}
if let snippet = objectAsDictionary["snippet"] as? [String: Any] {
if let description = snippet["description"] {
//pass data to table cell
}
}
}
}
}
}
}
}
}
task.resume()
}
I tried appending the values to an instance variable but it didn't work.
Sorry about the messy code, this is my 1st time working with JSON in Swift.

Answer 1

First of all never declare a received JSON dictionary as [String:Any?]. A received dictionary value can't be nil.
Declare a custom struct Video.
struct Video {
let videoId : String
let description : String
}
Declare a data source array.
var videos = [Video]()
Parse the JSON into the array and reload the table view on the main thread.
func callYouTubeAPIToGetAllVideos() {
let url = URL(string: "https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=XYZ&maxResults=50&order=date&key=ABC")
let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
if error != nil {
print(error!)
} else {
do {
if let dictionary = try JSONSerialization.jsonObject(with: data!) as? [String: Any],
let array = dictionary["items"] as? [[String: Any]] {
for object in array {
if let objectWithKindAndVideoId = object["id"] as? [String: String],
let snippet = object["snippet"] as? [String: Any] {
let videoId = objectWithKindAndVideoId["videoId"] ?? ""
let description = snippet["description"] as? String ?? ""
let video = Video(videoId: videoId, description: description)
self.videos.append(video)
}
}
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
} catch {
print(error)
}
}
}
task.resume()
}
In cellForRow assign the values to the text properties
let video = videos[indexPath.row]
cell.textLabel!.text = video.videoId
cell.detailTextLabel?.text = video.description