CODEWITHSUNDEEP
swiftswiftui
lula08
lula08

Reputation: 215

How do I get a variable from a "higher view" into a "ower view" in SwiftUI?

I´m new in SwiftUI and I would know how can I get the variable "Selection" from ContentView into SettingView in my "special" case with UserDefaults.standard.integer. I think with @Binding is it not possible, right?

import SwiftUI
import Combine

struct ContentView: View {
    
    @State var Selection = UserDefaults.standard.integer(forKey: "Picker")
    @State var Detail = false
    
    var body: some View {
        VStack {
        Button(action: {
            self.Detail.toggle()
        }) {
            Text("click")
        }.sheet(isPresented: $Detail) {
            SettingView(showSheetView: self.$Detail)
        }
        
        Picker("", selection: $Selection) {
            Text("Selection1").tag(0)
            Text("Selection2").tag(1)
            } .pickerStyle(SegmentedPickerStyle()).padding(.horizontal, 89)
            .onReceive(Just(Selection)) {
                UserDefaults.standard.set($0, forKey: "Picker")
            }
        }
    }
}

struct SettingView: View {
   
    @Binding var showSheetView: Bool
    
    var body: some View {
        NavigationView {
                Text("Test")
                .navigationBarTitle(Text("Select something"))
                .navigationBarItems(trailing: Button(action: {
                    self.showSheetView = false
                }) {
                    Text("Ok")
                        .bold()
                        
            })
        }
    }
}

Upvotes: 0

Views: 65

Answers (1)

pawello2222
pawello2222

Reputation: 54466

You can use @Binding:

.sheet(isPresented: $Detail) {
    // pass the `Selection` as a Binding
    SettingView(showSheetView: self.$Detail, selection: $Selection)
}

struct SettingView: View {
    @Binding var showSheetView: Bool
    @Binding var selection: Int // access as a Binding

    var body: some View {
        NavigationView {
            Text("Test \(selection)") // use as any other variable
            ...
        }
    }
}

Note: it's generally better to use lowercase when naming Swift variables, ie. selection and not Selection.

Upvotes: 2

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