CODEWITHSUNDEEP
swiftswiftui
DJJazz
DJJazz

Reputation: 55

SwiftUI: Views are not changing after value updated in array

Starter question: I'm trying to get a View to update after variables included in the array [Member] do change. Pressing the button in the code below does not do anything. After reading many similar topics I know this can not work, but I have no idea how solve it.

import SwiftUI

class Member: Identifiable, ObservableObject {
    var id = UUID()
    @Published var value:Int
    
    init(value:Int) {
        self.value = value
    }
}

class Values:ObservableObject {
    @Published var v1:Int = 1
    @Published var v2:Int = 2
    @Published var v3:Int = 3
}

struct ContentView: View {
    var values = Values()
    var items: [Member]
    
    init() {
        items = [Member(value: values.v1), Member(value: values.v2), Member(value: values.v3)]
    }
    
    var body: some View {
        VStack {
            HStack {
                ForEach(items) {i in
                    Text("Value: \(i.value)")
                }
            }
            Button("Change v2 = 0") {
                values.v2 = 0
            }
        }
    }
}

Upvotes: 0

Views: 700

Answers (1)

nicksarno
nicksarno

Reputation: 4245

I think this is what you're trying to do...

struct Member: Identifiable {
    var id = UUID()
    var value: Int
}

class Values: ObservableObject {
    
    @Published var items = [Member]()
    
    init() {
        items = [Member(value: 1), Member(value: 2), Member(value: 3)]
    }
    
}

struct ContentView2: View {
    @ObservedObject var values = Values()
    
    var body: some View {
        VStack {
            HStack {
                ForEach(values.items) { item in
                    Text("Value: \(item.value)")
                }
            }
            Button("Change 2nd index = 0") {
                values.items[1].value = 0
            }
        }
    }
}

Upvotes: 1

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