Swift i want to check the data entered by user - swift

Question

I'm new to coding on Swift and I'm having a problem with a code. I want to verify the data entered by the user.
IngredientDetailView contains a form to add or modify an ingredient. In this view I want to control the data entered by the user. So the ingredients have a unique name.
My problem
When I modify the name of an existing ingredient with a name of another ingredient, my control does not work.
IngredientListView contains the list of existing ingredients that can be modified.
Thanks in advance for reading and helping.
struct IngredientDetailView: View {
#Environment(\.dismiss) private var dismiss
#State var ingredientItemData : Ingredient
#EnvironmentObject var ingredientsVM: IngredientModel
// To display the message that an ingredient already exists
#State private var showingAlertIngredientExist = false
let metrics: [String] = [
"Unité", "kg", "g", "l", "ml"
]
var body: some View {
List{
TextField("Ingredient name", text: $ingredientItemData.nom)
Text("Metric").bold()
Picker(selection: $ingredientItemData.metric, label: Text("Metric"), content: {
ForEach(metrics, id: \.self){ item in
Text(item)
}
}).pickerStyle(.segmented)
}
.toolbar{
ToolbarItem(placement: .navigationBarLeading){
Button("Cancel"){
dismiss()
}
}
ToolbarItem(placement: .navigationBarTrailing){
Button("Ok"){
//If the id already exists
if ingredientsVM.ingredients.contains(where: {$0.id == ingredientItemData.id}){
// If the name you entered already exists
if ingredientsVM.ingredients.contains(where: {$0.nom.lowercased() == ingredientItemData.nom.lowercased()}){
// We get the index of the element we are working on
let i = ingredientsVM.ingredients.firstIndex(where: {$0.id == ingredientItemData.id})
// We check if the name has not changed if the ingredient has not been modified
if ingredientsVM.ingredients[i!].nom == ingredientItemData.nom {
dismiss()
}
else
{
// The name you want to modify already exists
showingAlertIngredientExist.toggle()
}
}
else {
// We save and save in the application
ingredientsVM.add(ing: ingredientItemData)
dismiss()
}
} else{
// No ID so we check if the name entered by the user already exists
if ingredientsVM.ingredients.contains(where: {$0.nom.lowercased() == ingredientItemData.nom.lowercased()}){
// The name you want to modify already exists
showingAlertIngredientExist.toggle()
}
else{
// We save and save in the application
ingredientsVM.add(ing: ingredientItemData)
dismiss()
}
}
}
.alert(isPresented: $showingAlertIngredientExist){
Alert(title: Text("Ingredient already present"), message: Text("An ingredient already exists with this name !"), dismissButton: .default(Text("Ok")))
}
}
}
.navigationBarBackButtonHidden()
.navigationBarTitleDisplayMode(.inline)
}
}
struct IngredientDetailView_Previews: PreviewProvider {
static var previews: some View {
IngredientDetailView(ingredientItemData: Ingredient())
.environmentObject(IngredientModel())
}
}
struct IngredientListView: View {
#Environment(\.dismiss) private var dismiss
#State private var sheetIsPresented = false
#EnvironmentObject var ingredientVM: IngredientModel
func getIndex(item: Ingredient) -> Int{
return ingredientVM.ingredients.firstIndex{(item1) -> Bool in
return item.id == item1.id
} ?? 0
}
var body: some View {
NavigationStack{
List{
ForEach(ingredientVM.ingredients){ item in
NavigationLink{
IngredientDetailView(ingredientItemData: item)
}label: {
Text(item.nom)
}
}
.onDelete{ indexSet in
// Temporaire. Fonction à mettre dans le model
ingredientVM.ingredients.remove(atOffsets: indexSet)
ingredientVM.saveData()
}
}.navigationTitle("IngredientListView")
.navigationBarTitleDisplayMode(.automatic)
.toolbar{
ToolbarItem(placement: .navigationBarLeading){
EditButton()
}
ToolbarItem(placement: .navigationBarTrailing){
Button{
sheetIsPresented.toggle()
}label: {
Image(systemName: "plus")
}
}
}
.sheet(isPresented: $sheetIsPresented){
NavigationStack{
IngredientDetailView(ingredientItemData: Ingredient())
}
.presentationDetents([.large,.medium,.fraction(0.75)])
}
}
}
}
struct IngredientListView_Previews: PreviewProvider {
static var previews: some View {
IngredientListView()
.environmentObject(IngredientModel())
}
}
class IngredientModel: ObservableObject{
#Published var ingredients : [Ingredient] = []
let saveKey = "Ingredients"
init(){
loadData()
}
func add(ing: Ingredient){
if ing.id == nil{
var newIngredient = ing
newIngredient.id = UUID().uuidString
ingredients.append(newIngredient)
}else{
if let index = ingredients.firstIndex(where: {$0.id == ing.id}){
ingredients[index] = ing
}
}
saveData()
}
func loadData(){
if let data = UserDefaults.standard.data(forKey: saveKey){
if let decoded = try? JSONDecoder().decode([Ingredient].self, from: data){
ingredients = decoded
return
}
}
}
func saveData(){
if let encoded = try? JSONEncoder().encode(ingredients) {
UserDefaults.standard.set(encoded, forKey: saveKey)
}
}
}
class Ingredient: Identifiable, Codable{
var id: String?
var nom = ""
var metric = ""
init (){
}
init(id: String, nom: String, metric: String){
self.id = id
self.nom = nom
self.metric = metric
}
}