I found the Food app on GitHub and decided to fix it.
I recently worked on an experimental project where I had the opportunity to improve my coding skills. During the process, I made several changes to the code to make it more organized and efficient. Here are some of the changes I made:
Separated Views in ContentView
One of the first things I did was to separate the views that were created in one file, ContentView. By creating separate files for each view, I was able to easily locate and modify them. This helped make the code easier to read and understand.
import SwiftUI
struct ContentView: View {
// MARK: - PROPERTIES
@StateObject var viewModel = FoodViewModel()
// MARK: - BODY
var body: some View {
ZStack {
NavigationView {
TabView {
HomeScreen()
.environmentObject(viewModel)
.tabItem {
Image.homeAsset
Text(SC.tabHome.value)
}
OrderScreen().tabItem {
Image.orderAsset
Text(SC.tabOrder.value)
}
AccountScreen().tabItem {
Image.userAsset
Text(SC.tabAccount.value)
}
}.onAppear(){
UIToolbar.appearance().barTintColor = .lightGray
}
.accentColor(.red.opacity(0.8))
}
.onAppear {
viewModel.getBannerData()
}
}
}
}Created an API Service
I also created an API service to handle the data requests from the server. By doing so, I was able to keep the data requests separate from the views, which made the code more modular and easier to maintain.
struct APIService {
public static let share = APIService()
private let baseURL = URL(string: SC.baseURLMock.value)
private init() {}
func resultRequest<T: Codable>(endpoint: Endpoint, completion: @escaping (Result<T, Error>) -> Void) {
guard let url = baseURL else {return}
var request = URLRequest(url: url)
request.httpMethod = endpoint.method.rawValue
URLSession.shared.dataTask(with: request) { data, response, error in
if let error = error {
completion(.failure(error))
return
}
guard let httpResponse = response as? HTTPURLResponse, (200...299).contains(httpResponse.statusCode) else {
let statusCode = (response as? HTTPURLResponse)?.statusCode ?? -1
completion(.failure(APIError.invalidResponse(statusCode: statusCode)))
return
}
guard let data = data else {
completion(.failure(APIError.noData))
return
}
do {
let decodedResponse = try JSONDecoder().decode(T.self, from: data)
completion(.success(decodedResponse))
} catch {
completion(.failure(error))
}
}.resume()
}
}Created Image and String Extensions
To make the code more concise, I created extensions for images and strings. These extensions allowed me to add functionality to the built-in Swift classes and made the code more reusable.
extension String {
public static var empty: String {
return SC.empty.value
}
public static var dash: String {
return SC.dash.value
}
public static var threeSpace: String {
return SC.space.value
}
//: Error response convert
public func errorWith() -> NSError {
let error = NSError(
domain: .empty,
code: 429,
userInfo: [NSLocalizedDescriptionKey: self])
return error
}
}import SwiftUI
extension Image {
// MARK: Asset
public static var homeAsset: Image {
return Image(uiImage: UIImage(named: SC.homeAsset.value)!)
}
public static var orderAsset: Image {
return Image(uiImage: UIImage(named: SC.orderAsset.value)!)
}
public static var userAsset: Image {
return Image(uiImage: UIImage(named: SC.userAsset.value)!)
}
public static var drinkAsset: Image {
return Image(uiImage: UIImage(named: SC.drink.value)!)
}
public static var fastfoodAsset: Image {
return Image(uiImage: UIImage(named: SC.fastfood.value)!)
}
public static var healthyAsset: Image {
return Image(uiImage: UIImage(named: SC.healthy.value)!)
}
public static var riceAsset: Image {
return Image(uiImage: UIImage(named: SC.rice.value)!)
}
public static var snacksAsset: Image {
return Image(uiImage: UIImage(named: SC.snacks.value)!)
}
// MARK: System
public static var homeSystem: Image {
return Image(systemName: SC.homeSystem.value)
}
public static var caseBagSystem: Image {
return Image(systemName: SC.caseBagSystem.value)
}
public static var personSystem: Image {
return Image(systemName: SC.personSystem.value)
}
public static var emptyImage: Image {
return Image(systemName: SC.emptyImage.value)
}
public static var searchSystem: Image {
return Image(systemName: SC.searchSystem.value)
}
}Improved Usage of View Models
I also realized that the usage of the view model in the previous code was incorrect. To fix this, I restructured the code to better use the view model, which made the code more efficient.
import SwiftUI
class FoodViewModel: ObservableObject {
@Published var banner: [BannerModel] = []
@Published var collection : [OfferCollections] = []
@Published var voucher: Int?
@Published var restaurant : [RestaurantCollectionModel] = []
@Published var recommend : [RestaurantsModel] = []
@Published var offer : [OffersModel?] = []
func getBannerData() {
APIService.share.resultRequest(endpoint: FoodEndpoint.getMockData) { (result: Result<FoodDataModel, Error>) in
DispatchQueue.main.async {
self.banner.removeAll()
self.collection.removeAll()
switch result {
case .success(let value):
//banner
value.data?.banners.forEach({ item in
self.banner.append(item)
})
//voucher
self.voucher = value.data?.number_of_active_vouchers
//Collection
value.data?.offer_collections.forEach({ item in
self.collection.append(item)
})
//Restaurants
value.data?.restaurant_collections.forEach({ item in
self.restaurant.append(item)
})
//Recomended
value.data?.restaurant_collections[0].restaurants.forEach({ item in
self.recommend.append(item)
})
//offer
value.data?.restaurant_collections[0].restaurants[0].offers.forEach({ item in
self.offer.append(item)
})
case .failure(let error):
print(error)
}
}
}
}
}Because there is only one API, In ViewModel I made just one request
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