How to load that JSON on tableview? - ios

Question

I have problem with parse json to collectionview
That is my JSON:
{
"statusCode": 200,
"message": "Список курсов",
"content": [
{
"id": 1,
"slug": "kurs-a1",
"title": "Курс А1",
"can_access": 1,
"passed": 1,
"sections": [
{
"id": 1,
"slug": "razdel-1",
"title": "Раздел 1",
"can_access": 1,
"passed": 1,
"lessons": [
{
"id": 1,
"position": 1,
"title": "Сәлемдесу",
"slug": "salemdesu",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 1,
"passed": 1
},
{
"id": 3,
"position": 2,
"title": "Танысу",
"slug": "tanysu",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 1,
"passed": 1
}
]
},
{
"id": 2,
"slug": "razdel-2",
"title": "Раздел 2",
"can_access": 1,
"passed": 0,
"lessons": [
{
"id": 4,
"position": 3,
"title": "Бұл – менің отбасым",
"slug": "bul-menin-otbasym",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 1,
"passed": 0
},
{
"id": 5,
"position": 4,
"title": "Жасы нешеде?",
"slug": "zhasy-neshede",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 1,
"passed": 0
}
]
},
{
"id": 3,
"slug": "razdel-3",
"title": "Раздел 3",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 7,
"position": 5,
"title": "Туған күн",
"slug": "tugan-kun",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 9,
"position": 6,
"title": "Құттықтау",
"slug": "kuttyktau",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 4,
"slug": "razdel-4",
"title": "Раздел 4",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 10,
"position": 7,
"title": "Адам келбеті",
"slug": "adam-kelbeti",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 12,
"position": 8,
"title": "Адамның мінез-құлқы",
"slug": "adamnyn-minez-kulky",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 5,
"slug": "razdel-5",
"title": "Раздел 5",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 13,
"position": 9,
"title": "Менің мамандығым",
"slug": "menin-mamandygym",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 15,
"position": 10,
"title": "Кім болып жұмыс істейді?",
"slug": "kim-bolyp-zhumys-istejdi",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 6,
"slug": "razdel-6",
"title": "Раздел 6",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 16,
"position": 11,
"title": "Жұмыс орны",
"slug": "zhumys-orny",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 17,
"position": 12,
"title": "Жұмыс күні",
"slug": "zhumys-kuni",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 7,
"slug": "razdel-7",
"title": "Раздел 7",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 19,
"position": 13,
"title": "Тесты ЦОР-а",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 20,
"position": 14,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 8,
"slug": "razdel-8",
"title": "Раздел 8",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 22,
"position": 15,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 23,
"position": 16,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 9,
"slug": "razdel-9",
"title": "Раздел 9",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 25,
"position": 17,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 27,
"position": 18,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 10,
"slug": "razdel-10",
"title": "Раздел 10",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 28,
"position": 19,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 29,
"position": 20,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 11,
"slug": "razdel-11",
"title": "Раздел 11",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 32,
"position": 21,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 33,
"position": 22,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
},
{
"id": 12,
"slug": "razdel-12",
"title": "Раздел 12",
"can_access": 0,
"passed": 0,
"lessons": [
{
"id": 34,
"position": 23,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
},
{
"id": 35,
"position": 24,
"title": "Тесты",
"slug": "testy",
"image": "https://tilqural.kz/assets/img/default-lesson-icon.png",
"can_access": 0,
"passed": 0
}
]
}
]
}
]
}
I decode it and i want parse it to collectionview.
How can i get content [{sections[{lessons[{title}]}]}]?
I made a request
func numberOfSections(in collectionView: UICollectionView) -> Int {
return arrData1.count
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
let dn = arrData1[section]
let st = dn.sections?[section]
return (st?.lessons?.count)!
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "main_cell", for: indexPath) as! MainCollectionViewCell
cell.lesson_text_1.text = arrData1.first?.sections?[indexPath.item].title
// cell.lesson_img_1.image = UIImage(named: lesson_image_1[indexPath.row])
// cell.lesson_text_1.text = lesson_text_1[indexPath.row]
return cell
}
but it return 2 cell to me
But i need 24 lessons!
Thank you
Decoding
struct Welcome: Codable {
let statusCode: Int
let message: String
let content: [Content]
}
struct Content: Codable {
let id: Int
let slug, title: String
let canAccess: Int?
let passed: Int
let sections: [Content]?
let lessons: [Lesson]?
enum CodingKeys: String, CodingKey {
case id, slug, title
case canAccess = "can_access"
case passed, sections
case lessons = "lessons"
}
}
struct Lesson: Codable {
let id, position: Int
let title, slug: String
let image: String
let canAccess: Int?
let passed: Int
enum CodingKeys: String, CodingKey {
case id, position, title, slug, image
case canAccess = "can_access"
case passed
}
}
api call function
let mData = session.dataTask(with: request as URLRequest) { (data, response, error) -> Void in
guard let data = data else { return }
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let data_new = try decoder.decode(Welcome.self, from: data)
DispatchQueue.main.async {
self.tableview.reloadData()
self.arrData1 = data_new.content
print(data_new)
}
} catch {
print("Error in CheckNew is : \n\(error)")
}
}
mData.resume()
enter image description here

Answer 1

Although the JSON structure is quite similar I recommend to use separate structs for Section and Lesson.
Another benefit is you get rid of all optionals
struct Welcome: Codable {
let statusCode: Int
let message: String
let content: [Content]
}
struct Content: Codable {
let id: Int
let slug, title: String
let canAccess: Int
let passed: Int
let sections: [Section]
}
struct Section: Codable {
let id: Int
let title, slug: String
let canAccess: Int
let passed: Int
let lessons: [Lesson]
}
struct Lesson: Codable {
let id, position: Int
let title, slug: String
let image: URL
let canAccess: Int
let passed: Int
}
As you are using the .convertFromSnakeCase strategy all coding keys are redundant.