Cannot add something to an Array - ios

Question

i have made an app in SwiftUI where you can create different classes. The app saves this in an array. I have a textfield and a button in the same view as the scrollview that displays the array. This works perfectly fine and I can easily add new classes. Now I made a new view with a text field and a button. This view can be viewed by pressing a button in the nav bar. It uses the exact same function as the other view, but in the other view adding a item to the array works, in this view it doesn't work. I hope you understand my problem and can help me.
Thank You.
This is the file where I store the array:
import Foundation
import SwiftUI
import Combine
struct Class: Identifiable {
var name: String
var id = UUID()
}
class ClassStore: ObservableObject {
#Published var classes = [Class]()
}
This is the view with the button + textfield that works and the scrollview that displays the array:
import SwiftUI
struct ContentView: View {
#State var showNewClass = false
#ObservedObject var classStore = ClassStore()
#State var newClass: String = ""
#State var toDoColor: Color = Color.pink
func addNewClass() {
classStore.classes.append(
Class(name: newClass)
)
newClass = ""
}
var body: some View {
NavigationView {
VStack {
HStack {
TextField("New Todo", text: $newClass)
Image(systemName: "app.fill")
.foregroundColor(Color.pink)
.padding(.horizontal, 3)
Image(systemName: "books.vertical")
.padding(.horizontal, 3)
if newClass == "" {
Text("Add!")
.foregroundColor(Color.gray)
} else {
Button(action: {
addNewClass()
}) {
Text("Add!")
}
}
}.padding()
ScrollView {
ForEach(self.classStore.classes) { name in
Text(name.name)
}
}
.navigationBarTitle(Text("Schulnoten"))
.navigationBarItems(trailing:
Button(action: {
self.showNewClass.toggle()
}) {
Text("New Class")
}
.sheet(isPresented: $showNewClass) {
NewClass(isPresented: $showNewClass)
})
}
}
}
}
And this is the new view I created, the button and the textfield have the exact same code, but somehow this doesn't work:
import SwiftUI
struct NewClass: View {
#Binding var isPresented: Bool
#State var className: String = ""
#ObservedObject var classStore = ClassStore()
func addNewClass() {
classStore.classes.append(
Class(name: className)
)
}
var body: some View {
VStack {
HStack {
Text("New Class")
.font(.title)
.fontWeight(.semibold)
Spacer()
}
TextField("Name of the class", text: $className)
.padding()
.background(Color.gray)
.cornerRadius(5)
.padding(.vertical)
Button(action: {
addNewClass()
self.isPresented.toggle()
}) {
HStack {
Text("Safe")
.foregroundColor(Color.white)
.fontWeight(.bold)
.font(.system(size: 20))
}
.padding()
.frame(width: 380, height: 60)
.background(Color.blue)
.cornerRadius(5)
}
Spacer()
}.padding()
}
}
Sorry if my English is not that good. I'm not a native speaker.

Answer 1

I assume you should pass same class store from parent view into sheet, ie
struct NewClass: View {
#Binding var isPresented: Bool
#State var className: String = ""
#ObservedObject var classStore: ClassStore // << expect external
and in ContentView
.sheet(isPresented: $showNewClass) {
NewClass(isPresented: $showNewClass, classStore: self.classStore) // << here !!
})