Super simple error handling in SwiftUI

HandleErrors.swift

//
//  HandleErrors.swift
//  App
//
//  Created by Evan Coleman on 12/30/22.
//

import SwiftUI

// MARK: Usage Example/Preview

struct HandleErrorViewModifier_Previews: PreviewProvider {
    static var previews: some View {
        ErroringView()
            .handleErrors()
    }

    struct ErroringView: View {

        @Environment(\.handleError) var handleError

        var body: some View {
            Button("Trigger Error", action: { handleError(Error()) })
        }

        struct Error: LocalizedError {
            var errorDescription: String? = "This is a test error"
        }
    }
}

// MARK: HandleErrorAction

private struct HandleErrorKey: EnvironmentKey {
    static let defaultValue: HandleErrorAction = .init(handler: { _ in })
}

extension EnvironmentValues {
    var handleError: HandleErrorAction {
        get { self[HandleErrorKey.self] }
        set { self[HandleErrorKey.self] = newValue }
    }
}

struct HandleErrorAction {

    var handler: (Error) -> Void

    func callAsFunction(_ error: Error) {
        handler(error)
    }
}

// MARK: HandleErrorViewModifier

extension View {

    func handleErrors() -> some View {
        modifier(HandleErrorViewModifier())
    }
}

struct HandleErrorViewModifier: ViewModifier {

    @State var currentError: Error?

    private var isPresented: Binding<Bool> {
        .init(
            get: { currentError != nil },
            set: { newValue in
                if !newValue {
                    currentError = nil
                }
            }
        )
    }

    func body(content: Content) -> some View {
        content
            .alert("Oh no!", isPresented: isPresented, actions: {
                Button(action: { currentError = nil }) {
                    Text("Dismiss")
                }
            }, message: {
                Text(currentError?.localizedDescription ?? "")
            })
            .environment(\.handleError, HandleErrorAction { error in
                currentError = error
            })
    }
}