Looping an array received from service - ios

Question

JSON from service
{
"firstname": "Utku",
"lastname": "Dalmaz",
"photos": [{
"src": "image",
"post_id": "69"
}, {
"src": "image",
"post_id": "74"
}, {
"src": "image",
"post_id": "133"
}, {
"src": "image",
"post_id": "142"
}]}
SWIFT CODE
Alamofire.request("SERVICE", method: .post, parameters: parameters).validate().responseJSON { response in
switch response.result {
case .success:
if let json = response.result.value {
var success = 0
if let dictJSON = json as? [String: AnyObject] {
if let successInteger = dictJSON["success"] as? Int {
success = successInteger
if success == 1
{
self.firstname = dictJSON["firstname"] as! String
self.lastname = dictJSON["lastname"] as! String
if let photos = dictJSON["photos"] as! Array<String> {
let postID = //post_id data
let src = //src data
let data = InboxPhotos(ID: postID!, src: src!)
self.photosArr.append(data)
}
...
I am trying to get array data from JSON service. Even though I am able to get firstname and lastname data, I cannot get and loop photos array in swift code.
How can I loop photos array and get post_id and src data into InboxPhotos and append to photosArr array?

Answer 1

let dictJSON = ...
guard let photos = dictJSON?["photos"] as? [[String: Any]] else { return }
let list = photos.map { InboxPhotos(ID: $0["post_id"] as! String, src: $0["src"] as! String)}
// Or more safely.
let list2: [InboxPhotos] = photos.compactMap {
guard let src = $0["src"] as? String,
let id = $0["post_id"] as? String else {
return nil
}
return InboxPhotos(ID: id, src: src)
}

Answer 2

I have made JSON parsing modal for your JSON Data-Type. you don't need anything just pass data at the time create a modal object and get data without hectic.
struct UserModal{
var firstname:String
var lastname:String
var photos: [PhotosModal]
init(dictData:[String: Any]) {
self.firstname = dictData["firstname"] as? String ?? ""
self.lastname = dictData["lastname"] as? String ?? ""
var photosArr = [PhotosModal]()
for data in dictData["photos"] as? [[String:Any]] ?? [] {
photosArr.append(PhotosModal(src: data["src"] as! String, post_id: data["post_id"] as! Int))
}
self.photos = photosArr
}
}
struct PhotosModal{
var src:String
var post_id:Int
init(src:String, post_id:Int) {
self.src = src
self.post_id = post_id
}
}
let userModal = UserModal(dict: dictJSON?["photos"] as? [[String: Any]])
So Make separate file for this modal file. Applying this you will follow Single responsibility class/file of SOLID principal rules.