Parse JSON from GoogleApiBooks - json

Question

I'm trying to parse this JSON but it don't works.
This is the JSON:
{
"kind": "books#volumes",
"totalItems": 1,
"items": [
{
"kind": "books#volume",
"id": "uCHmPQAACAAJ",
"etag": "aBZ3KnoRsq4",
"selfLink": "https://www.googleapis.com/books/v1/volumes/uCHmPQAACAAJ",
"volumeInfo": {
"title": "Psicologia delle folle",
"authors": [
"Gustave Le Bon"
],
"publishedDate": "2004",
"industryIdentifiers": [
{
"type": "ISBN_10",
"identifier": "8850206240"
},
{
"type": "ISBN_13",
"identifier": "9788850206247"
}
],
"readingModes": {
"text": false,
"image": false
},
"pageCount": 251,
"printType": "BOOK",
"categories": [
"Psychology"
],
"maturityRating": "NOT_MATURE",
"allowAnonLogging": false,
"contentVersion": "preview-1.0.0",
"language": "it",
},
"saleInfo": {
"country": "IT",
"saleability": "NOT_FOR_SALE",
"isEbook": false
},
"accessInfo": {
"country": "IT",
"viewability": "NO_PAGES",
"embeddable": false,
"publicDomain": false,
"textToSpeechPermission": "ALLOWED",
"epub": {
"isAvailable": false
},
"pdf": {
"isAvailable": false
},
,
"accessViewStatus": "NONE",
"quoteSharingAllowed": false
}
}
]
}
And this is the code that i'm using:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var url = "https://www.googleapis.com/books/v1/volumes?q=isbn9788850206247&key=my-key"
Alamofire.request(url).responseJSON { (responseData) -> Void in
if((responseData.result.value) != nil) {
let swiftyJsonVar = JSON(responseData.result.value!)
if let resData = swiftyJsonVar["items"].arrayObject {
self.arrRes = resData as! [[String:AnyObject]]
print(self.arrRes)
}
if self.arrRes.count > 0 {
self.tableProva.reloadData()
}
}
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableProva.dequeueReusableCell(withIdentifier: "cellProva", for: indexPath) as! CellProvaClass
var dict = arrRes[indexPath.row]
cell.titleLabel?.text = dict["title"] as? String
cell.authorLabel?.text = dict["authors"] as? String
return cell
}
How can I solve this problem?

Answer 1

This is your JSON Reponse ( in short format) :
And this is the data structure (Array and dictionary format) :
Now you have to access : title and authors so here is your value in cellforRowAtIndexPath Method , a dictionary having name dict stores values of volumeInfo ( a Dictionary) :
so you have to use this way to access title :
cell.titleLabel?.text = dict["volumeInfo"]["title"] as? String
//To Fetch Author array
if let authorArray = dict["volumeInfo"]["authors"] as? NSArray{
print(authorArray)
}
and then to access author is an array so which index of value you want to show in cell.authorLabel .
In Second Screenshot those which are enclosed with {} is Dictionary and [] is Array
First try to show Title and then same way try to fetch value of author array and set according to your requirement.
Feel Free to comment if any further issue.

Answer 2

When you are parsing the JSON on line
if let resData = swiftyJsonVar["items"].arrayObject {
you will receive an object of NSDictionary which contains all other nested elements & arrays in keys. In your tableView delegate you are directly accessing the value from arrRes by unboxing it to NSDictionary object. All the entries are available in an array named items which further has a nested object volumeInfo which contains the info about title & another array of Authors.
You need to extract the further nested objects from arrRes object to use it in your tableView cellForRowAtIndex delegate function.
Let me know if you need any further help.