I'm learning Swift and SwiftUI and trying to understand how MVVM, data flow, and network requests work. I created a simple app that gets data in JSON from the URL and shows covid information for the selected country.
I have settings where I can change the country and hide covid data with toggles. I want to instantly reload all data from the URL in the MainView.swift if country changed in the Settings.swift
When I change the country in the settings > close settings > view data remains the same, it only updates if I force close the app then reopen.
Here is a link to a video with issue
Model.swift
import SwiftUI
struct Covid19Data: Codable {
let country: String
let cases: Int
let todayCases: Int
let deaths: Int
let todayDeaths: Int
let recovered: Int
let active: Int
let critical: Int
let casesPerOneMillion: Int
let deathsPerOneMillion: Int
let totalTests: Int
let testsPerOneMillion: Int
}
let countrySelection = ["Ukraine", "Canada", "Germany"]
ViewModel.swift
import SwiftUI
class CovidFetcher: ObservableObject {
@Published var jsonFetch: Covid19Data?
@ObservedObject var userSettings = UserSettings()
init(){
load()
}
func load() {
let url = URL(string: "https://coronavirus-19-api.herokuapp.com/countries/\(countrySelection[userSettings.selectedCountryIndex])")
URLSession.shared.dataTask(with: url!) { (data, response, error) in
if let d = data {
let webData = try? JSONDecoder().decode(Covid19Data.self, from: d)
DispatchQueue.main.async {
self.jsonFetch = webData
}
}
}.resume()
}
}
class UserSettings: ObservableObject {
@Published var selectedCountryIndex: Int {
didSet {
UserDefaults.standard.set(selectedCountryIndex, forKey: "selectedCountryIndex")
}
}
init() {
self.selectedCountryIndex = UserDefaults.standard.object(forKey: "selectedCountryIndex") as? Int ?? 0
}
}
MainView.swift
import SwiftUI
struct MainView: View {
@ObservedObject var fetcher = CovidFetcher()
@ObservedObject var userSettings = UserSettings()
@State var showOrderSheet = false
var body: some View {
VStack {
VStack {
Button(action: {
showOrderSheet.toggle()
}) {
Image(systemName: "gear")
.font(.system(size: 20))
}
.fullScreenCover(isPresented: $showOrderSheet) {
Settings(fetcher: self.fetcher, userSettings: self.userSettings)
}
}.offset(x: -155, y: 5)
VStack {
Text(countrySelection[userSettings.selectedCountryIndex])
.bold()
.frame(width: 150, height: 170, alignment: .center)
}
VStack {
List {
Group {
if userSettings.casesToggle {
HStack {
Text("Cases:")
Spacer()
Text("\(self.fetcher.jsonFetch?.cases ?? 0)")
}
}
if userSettings.casesTodayToggle {
HStack {
Text("Cases Today:")
Spacer()
Text("\(self.fetcher.jsonFetch?.todayCases ?? 0)")
}
}
if userSettings.deathsToggle {
HStack {
Text("Deaths:")
Spacer()
Text("\(self.fetcher.jsonFetch?.deaths ?? 0)")
}
}
if userSettings.deathsTodayToggle {
HStack {
Text("Deaths Today:")
Spacer()
Text("\(self.fetcher.jsonFetch?.todayDeaths ?? 0)")
}
}
if userSettings.recoveredToggle {
HStack {
Text("Recovered:")
Spacer()
Text("\(self.fetcher.jsonFetch?.recovered ?? 0)")
}
}
if userSettings.activeToggle {
HStack {
Text("Active:")
Spacer()
Text("\(self.fetcher.jsonFetch?.active ?? 0)")
}
}
if userSettings.criticalToggle {
HStack {
Text("Critical:")
Spacer()
Text("\(self.fetcher.jsonFetch?.critical ?? 0)")
}
}
}
Group {
if userSettings.casesPerOneMillionToggle {
HStack {
Text("Cases Per One Million:")
Spacer()
Text("\(self.fetcher.jsonFetch?.casesPerOneMillion ?? 0)")
}
}
if userSettings.deathsPerOneMillionToggle {
HStack {
Text("Deaths Per One Million:")
Spacer()
Text("\(self.fetcher.jsonFetch?.deathsPerOneMillion ?? 0)")
}
}
if userSettings.totalTestsToggle {
HStack {
Text("Total Tests:")
Spacer()
Text("\(self.fetcher.jsonFetch?.totalTests ?? 0)")
}
}
if userSettings.testsPerOneMillionToggle {
HStack {
Text("Tests Per One Million:")
Spacer()
Text("\(self.fetcher.jsonFetch?.testsPerOneMillion ?? 0)")
}
}
}
}
.listStyle(InsetGroupedListStyle())
}
}
.navigationBarBackButtonHidden(true)
.navigationBarHidden(true)
}
}
Settings.swift
import SwiftUI
struct Settings: View {
@ObservedObject var fetcher = CovidFetcher()
@ObservedObject var userSettings = UserSettings()
@Environment (\.presentationMode) var presentationMode
var body: some View {
NavigationView {
Form {
Section(header: Text("Change country")) {
Picker(selection: $userSettings.selectedCountryIndex, label: Text("Select Country")) {
ForEach(0 ..< countrySelection.count, id: \.self) { countryInx in
Text(countrySelection[countryInx])
}
}
}
Section(header: Text("Select Data")) {
VStack {
List {
Group {
Toggle("Cases", isOn: $userSettings.casesToggle)
Toggle("Cases Today", isOn: $userSettings.casesTodayToggle)
Toggle("Deaths", isOn: $userSettings.deathsToggle)
Toggle("Deaths Today", isOn: $userSettings.deathsTodayToggle)
Toggle("Recovered", isOn: $userSettings.recoveredToggle)
Toggle("Active", isOn: $userSettings.activeToggle)
Toggle("Critical", isOn: $userSettings.criticalToggle)
}
Group {
Toggle("Cases Per One Million", isOn: $userSettings.casesPerOneMillionToggle)
Toggle("Deaths Per One Million", isOn: $userSettings.deathsPerOneMillionToggle)
Toggle("Total Tests", isOn: $userSettings.totalTestsToggle)
Toggle("Tests Per One Million", isOn: $userSettings.testsPerOneMillionToggle)
}
}
}
}
Button(action: {
userSettings.hasOnBoarded = false
}) {
Text("Reset Onboarding ")
}
}
.listStyle(InsetGroupedListStyle())
.navigationBarTitle("Settings", displayMode: .inline)
.navigationBarItems(trailing: Button("Done") {
self.fetcher.load()
presentationMode.wrappedValue.dismiss()
})
}
}
}
URL with JSON data - "https://coronavirus-19-api.herokuapp.com/countries/"
I've tried to call fetcher.load() in the settings when pressing the "Done" button but it doesn't reload the view, also googled a lot but cannot find an answer.
