purchases-ios/RevenueCatUI/CustomerCenter/Views/CompatibilityNavigationStack.swift

//
//  Copyright RevenueCat Inc. All Rights Reserved.
//
//  Licensed under the MIT License (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      https://opensource.org/licenses/MIT
//
//  CompatibilityNavigationStack.swift
//
//
//  Created by Cody Kerns on 8/15/24.
//

#if os(iOS)

import SwiftUI

@available(iOS 15.0, *)
@available(macOS, unavailable)
@available(tvOS, unavailable)
@available(watchOS, unavailable)
struct CompatibilityNavigationStack<Content: View>: View {

    @ViewBuilder var content: () -> Content

    var body: some View {
        if #available(iOS 16.0, *) {
            NavigationStack(root: content)
        } else {
            NavigationView(content: content)
        }
    }
}

extension View {
    /// Adds backward-compatible navigation, supporting both iOS 16+ and earlier versions.
    /// - Parameters:
    ///   - isPresented: A binding to a Boolean that determines whether the destination is presented.
    ///   - destination: A closure that returns the destination view.
    @ViewBuilder func compatibleNavigation<Destination: View>(
        isPresented: Binding<Bool>,
        usesNavigationStack: Bool,
        @ViewBuilder destination: @escaping () -> Destination
    ) -> some View {
        if #available(iOS 16.0, *), usesNavigationStack {
            self.navigationDestination(isPresented: isPresented, destination: destination)
        } else {
            self.background(
                NavigationLink(
                    destination: destination(),
                    isActive: isPresented
                ) {
                    EmptyView()
                }
                    .hidden() // Keeps the NavigationLink invisible
            )
        }
    }
}

extension View {
    /// Adds backward-compatible navigation, supporting both iOS 16+ and earlier versions, triggered by an optional
    /// binding.
    /// - Parameters:
    ///   - item: A binding to an optional value that triggers navigation when non-nil.
    ///   - destination: A closure that returns the destination view, taking the unwrapped value as a parameter.
    func compatibleNavigation<Item, Destination: View>(
        item: Binding<Item?>,
        usesNavigationStack: Bool,
        @ViewBuilder destination: @escaping (Item) -> Destination
    ) -> some View {
        compatibleNavigation(isPresented: item.isPresent(), usesNavigationStack: usesNavigationStack) {
            if let unwrapped = item.wrappedValue {
                destination(unwrapped)
            }
        }
    }
}

private extension Binding {

    func isPresent<Wrapped>() -> Binding<Bool> where Value == Wrapped? {
        Binding<Bool>(
            get: {
                self.wrappedValue != nil
            },
            set: { isActive in
                if !isActive {
                    self.wrappedValue = nil
                }
            }
        )
    }
}

#endif