SwiftUI VIEW change variable from external class - variables

Question

A similar question was asked before, and with the help of several netizens, some codes have been changed.
When press .. "Show Next View" >> "Change-Me" >> "Return" .. why the variable "price" can not change to 9 ....
I am a novice, I know there code have something wrong I can't find it and hope someone can guide me, Thanks!
class ExtenalClass {
let SubFrutis = ContentView()
func ExtChangePrice() {
SubFrutis.fChangePrice()
}
}
struct ContentView: View {
#State var price: Int = 0
#State var vPresent = false
func fChangePrice() {
price = 9
print("Price Value is: \(String(price))")
}
var body: some View {
VStack {
Text(String(price)).padding()
Button("Show Next View") { self.vPresent = true }
.sheet(isPresented: $vPresent) {
SecondView(vPresent: self.$vPresent)
}.padding()
Button("Add-Me") { price += 1 }.padding()
Button("RESET") { price = 1 }.padding()
}
}
}
struct SecondView: View {
#Binding var vPresent: Bool
var vExtenal = ExtenalClass()
var body: some View {
Button("Change-Me") {
vExtenal.ExtChangePrice()
// ContentView().fChangePrice()
}.padding()
Button("Return") { self.vPresent = false }
}
}