Latest

Latest.swift

import SwiftUI

// WARNING: This probably won't work how you want it to. Task only runs once per view (based on identity), so changing the sequence doesn't update the latest value!
struct Latest<S: AsyncSequence, Content: View>: View {
    var sequence: S
    var content: (S.Element?, Error?) -> Content
    
    init(_ sequence: S, @ViewBuilder content: @escaping (S.Element?, Error?) -> Content) {
        self.sequence = sequence
        self.content = content
    }
    
    @State var latest: S.Element?
    @State var error: Error?

    var body: some View {
        content(latest, error)
            .task {
                do {
                    for try await element in sequence {
                        self.latest = element
                    }
                } catch {
                    self.error = error
                }
            }
    }
}