Queryable

Asynchronous View Presentations in SwiftUI

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Turn this

ContentView.swift

struct ContentView: View {
  @State private var isShowingConfirmationAlert = false
  var body: some View {
    Button("Do it!") {
      isShowingConfirmationAlert = true
    }
    .alert(
      "Really?",
      isPresented: $isShowingConfirmationAlert
    ) {
      Button("Yes") { confirmAction(true) }
      Button("No") { confirmAction(false) }
    } message: {}
  }
  @MainActor
  private func confirmAction(_ isConfirmed: Bool) {
    print(isConfirmed)
  }
}

Into this

ContentView.swift

struct ContentView: View {
  @Queryable<Void, Bool> var buttonConfirmation
  var body: some View {
    Button("Do it!", action: confirm)
      .queryableAlert(
        controlledBy: buttonConfirmation,
        title: "Really?"
        ) { item, query in
          Button("Yes") { query.answer(with: true) }
          Button("No") { query.answer(with: false) }
      } message: {_ in}
  }
  @MainActor
  private func confirm() {
    Task {
      do {
        let isConfirmed = try await buttonConfirmation.query()
        print(isConfirmed)
      } catch {}
    }
  }
}

Queryable is a property wrapper that can trigger a view presentation and await its completion from a single async function call, while fully hiding the state handling of the presented view.