SwiftUI sheet shows sheet with wrong data

Question

I have a list that displays 1, 2, and 3. When the text is tapped the app opens a sheet with the number tapped. However, if I tap the text in the second or third row, the number displayed in the sheet is still 1. What am I doing wrong?

import SwiftUI

struct ContentView: View {
    
    var numbers = [1, 2, 3]
    @State private var shouldPresentSheet = false
    
    var body: some View {
        List(self.numbers, id: \.self) { number in
            Text("number: \(number)").sheet(isPresented: self.$shouldPresentSheet) {
                Text("This is sheet number \(number)")
            }.onTapGesture {
                self.shouldPresentSheet.toggle()
            }
        }
    }
}

Consider this solution stackoverflow.com/a/63089069/12299030 - you have same problem. — Asperi
– Asperi, Commented Aug 15, 2020 at 13:38

pawello2222 · Accepted Answer · 2020-08-15 13:58:26Z

You need to create one sheet instead of multiple sheets.

If you want to use .sheet(isPresented:content:) you can do the following:

struct ContentView: View {
    var numbers = [1, 2, 3]
    @State private var selectedNumber: Int?

    var body: some View {
        List(numbers, id: \.self) { number in
            Text("number: \(number)")
                .onTapGesture {
                    self.selectedNumber = number
                }
        }
        .sheet(isPresented: binding) {
            Text("This is a sheet number \(self.selectedNumber ?? 0)")
        }
    }

    var binding: Binding<Bool> {
        .init(
            get: { self.selectedNumber != nil },
            set: { _ in }
        )
    }
}

Alternatively you can use .sheet(item:content:):

struct Model: Identifiable {
    let id: Int
}

struct ContentView: View {
    var numbers = [1, 2, 3].map(Model.init)
    @State private var selectedNumber: Model?

    var body: some View {
        List(numbers, id: \.id) { number in
            Text("number: \(number.id)")
                .onTapGesture {
                    self.selectedNumber = number
                }
        }
        .sheet(item: $selectedNumber) { item in
            Text("This is a sheet number \(item.id)")
        }
    }
}

EDIT

If you decide to use .sheet(item:content:) you can add an extension to Int (instead of creating a custom struct conforming to Identifiable):

extension Int: Identifiable {
    public var id: Int { self }
}

as proposed in Asperi's answer.

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