Popover.swift

import ComposableArchitecture
import SwiftUI

struct PopoverReducer: ReducerProtocol {

	struct State: Hashable {
		var isPopoverVisible: Bool
	}

	enum Action: Hashable {
		case setPopoverVisible(visible: Bool)
	}

	func reduce(into state: inout State, action: Action) -> Effect<Action, Never> {
		switch action {
		case .setPopoverVisible(let visible):
			state.isPopoverVisible = visible
			return .none
		}
	}

}

struct ContentView: View {

	let store: StoreOf<PopoverReducer> = .init(
		initialState: .init(isPopoverVisible: false),
		reducer: PopoverReducer()
	)

	var body: some View {
		WithViewStore(store) { viewStore in
			VStack {
				Button {
					viewStore.send(.setPopoverVisible(visible: true))
				} label: {
					{ () -> EmptyView in
						print("PARENT RENDER")
						return EmptyView()
					}()
					Text("Open popover")
				}
			}
			.padding()
			.popover(
				isPresented: viewStore.binding(
					get: { $0.isPopoverVisible },
					send: PopoverReducer.Action.setPopoverVisible(visible:)
				)
			) {
				{ () -> EmptyView in
					print("POPOVER RENDER")
					return EmptyView()
				}()
				Text("Popover")
			}
		}
	}
}