How to get specific datas from web api to the table view sections?

Question

I am using web api for food names and foodCategories. How can I match my breakfasts category section only with breakfasts, burgers, desserts, drinks, salads. Problem is each section has all foods again and again.

FoodCategory

struct FoodCategory: Decodable {
var id: Int
var Title: String //Category Title
}

Food category title is in two models both.

Food

struct Food: Codable {
    let id, SubCategoryId: Int
    let CategoryTitle: String //Category Title
    let Price, OldPrice: Decimal
    let ProductTitle: String //Food Name
    let Stock: Int
    let Details: String
    let DetailsList: [String]
}

FoodCategoryServiceResponse

   "ResultList": [
    {
        "id": 1,
        "Title": "Kahvaltılar"
    },
    {
        "id": 5,
        "Title": "Hamburgerler"
    },
    {
        "id": 6,
        "Title": "İçecekler"
    },
    {
        "id": 7,
        "Title": "Tatlılar"
    },
    {
        "id": 9,
        "Title": "Salatalar"
    }
   ]

FoodServiceResponse

"ResultList": [
{
"id": 114,
"SubCategoryId": 28,
"SubCategoryTitle": "Hafta İçi Kahvaltısı",
"CategoryTitle": "Kahvaltılar",
"Title": null,
"Price": 18,
"OldPrice": 0,
"PriceString": " 18,00  ₺",
"OldPriceString": " 0,00  ₺",
"ProductTitle": "Hafta İçi Kahvaltısı",
"IsIndexView": false,
"Description": "Ekmek Üzeri Çırpılmış Yumurta, 1 Dilim Beyaz Peynir, Çilek Reçeli, 1 Bardak Çay",
"Stock": 0,
} ]

Tableview codes

 var foodData = [Food]() 
    var foodCategoryData = [FoodCategory]()

 func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return foodCategoryData[section].Title
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return foodCategoryData.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return foodData.count
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: "CellForFood") as! MainFoodTitleTableViewCell
        let foodList = foodData[indexPath.row]
        //        let food = foods.filter({$0.category == sections[indexPath.section]})[indexPath.row]
        cell.titleLabel.text = foodList.ProductTitle
        cell.priceLabel.text = foodList.PriceString

        return cell
    }

score 1 · Accepted Answer · answered May 10 '19 at 19:31

I recommend to use two structs as data model

struct Category {
    let name : String
    let foods : [Food]
}

struct Food {
    let name : String
    let price : Double
}

let categories = [
    Category(name: "Breakfast", foods : [
        Food(name: "Hafta İçi Kahvaltısı", price: 18.0),
        Food(name: "Pazar Kahvaltısı", price: 25.0),
        Food(name: "Diyet Kahvaltı", price: 22.0),
        Food(name: "Köy Kahvaltısı", price: 15.0),
        Food(name: "Ege Kahvaltısı", price: 30.0)]),
    Category(name: "Hamburger", foods : [
        Food(name: "Big TezBurger", price: 26.0),
        Food(name: "TezRoyal", price: 24.0),
        Food(name: "Double TezzBurger", price: 17.0),
        Food(name: "TezChicken", price: 21.0),
        Food(name: "Köfteburger", price: 28.0)])
]

This reduces the code in the table view data source and delegate methods considerably

func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return categories[section].name
}

func numberOfSections(in tableView: UITableView) -> Int {
    return categories.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return categories[section].foods.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "CellForFood", for: indexPath) as! MainFoodTitleTableViewCell

    let category = categories[indexPath.section]
    let food = category.foods[indexPath.row]    
    cell.title = food.name
    cell.price = food.price
    return cell
}

Your code in cellForRowAt makes no sense anyway. This method is called once for each row in each section.

Sorry, you messed up the entire question. Please revert it to the last version and ask a new question. And please read my answer carefully to understand how to get the items in `cellForRow` depending on section and row. — vadian, Jun 12 '19 at 17:04
I tried like your `let categories = []` code block. If I fill my category names like yours it is okay because there is only 5 static datas for categories. But if I use foods object in `Category' struct like yours I should initialize with static data also. foods object has a lot of property and it gets messy. — Emre Değirmenci, Jun 12 '19 at 17:22
If you have static data organize it in a Property List or JSON file in the application bundle and load the data with `PropertyListDecoder()` or `JSONDecoder()`. That's pretty fast and pretty clean. — vadian, Jun 12 '19 at 17:26
Yes it is so meaningful recommendation. But I tried your recommendation for saving my table view data for logged in user's shopping cart and I did not success. After I tried with `CoreData` and also did not success. Because I am awkward person. https://stackoverflow.com/questions/56509495/how-to-save-existing-singleton-table-view-data-in-core-data — Emre Değirmenci, Jun 12 '19 at 17:49

score 0 · Answer 2 · answered May 10 '19 at 19:25

Create an array that represents your sections

let sections = ["Breakfast", "Hamburger", "Drinks", "Dessert", "Salad"]

Then change your functions to

func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return sections[section]
}

func numberOfSections(in tableView: UITableView) -> Int {
    return sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let sectionName = sections[section]
        return foods.filter({ $0.category == sectionName }).count

}


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "CellForFood") as! MainFoodTitleTableViewCell

    food = foods.filter({ $0.name == sections[indexPath.section] })[indexPath.row]
    cell.title = food.name
    cell.price = food.price

    return cell
}

Fatal error: index out of range on this line `food = foods.filter({ $0.name == sections[indexPath.section] })[indexPath.row]` @agrizzo — Emre Değirmenci, May 10 '19 at 19:39

How to get specific datas from web api to the table view sections?

2 Answers2