- Concept

✨ LinkNavigator is a library that helps you easily navigate between pages in SwiftUI.

• LinkNavigator provides an intuitive syntax for navigating pages via URL path-like expressions.
• You can easily go to any page with the deep-link processing style.
• You can inject parameters with page transition.
• LinkNavigator is designed for use in Uni-directional Architecture such as MVI design pattern or The Composable Architecture from pointfreeco, but it can be used in other architectures as well.

- Translations

The following translations of this README have been contributed by members of the community:

• 한국어(Korean)

If you'd like to contribute a translation, please open a PR with a link to a Gist!

- Basic Usage

• push one or many pages.

  navigator.next(paths: ["page1", "page2"], items: [:], isAnimated: true)

• pop one or many pages.

  navigator.remove(paths: ["pageToRemove"])

• back to the prior page or dismiss modal simply.

  navigator.back(isAnimated: true)

• go to the page you want. If that page is already within navigation stack, go back to that page. Else if that page is not within stack, push new one.

  navigator.backOrNext(path: "targetPage", items: [:], isAnimated: true)

• replace current navigation stack with new one.

  navigator.replace(paths: ["main", "depth1", "depth2"], items: [:], isAnimated: true)

• open page as sheet or full screen cover.

  navigator.sheet(paths: ["sheetPage"], items: [:], isAnimated: true)
  
  navigator.fullSheet(paths: ["page1", "page2"], items: [:], isAnimated: true, prefersLargeTitles: false)

• close a modal and call completion closure.

  navigator.close(isAnimated: true) { print("modal dismissed!") }

• show a system alert.

  let alertModel = Alert(
  title: "Title",
  message: "message",
  buttons: [.init(title: "OK", style: .default, action: { print("OK tapped") })],
  flagType: .default)
  navigator.alert(target: .default, model: alertModel)

- Advanced Usage

• edit complicated paths and use it.

  // current navigation stack == ["home", "depth1", "depth2", "depth3"]
  // target stack == ["home", "depth1", "newDepth"]
  
  var new = navigator.range(path: "depth1") + ["newDepth"]
  navigator.replace(paths: new, items: [:], isAnimated: true)

• control pages behind modal.

  navigator.rootNext(paths: ["targetPage"], items: [:], isAnimated: true)
  
  navigator.rootBackOrNext(path: "targetPage", items: [:], isAnimated: true)

• you can choose modal presentation styles for iPhone and iPad respectively.

  navigator.customSheet(
  paths: ["sheetPage"],
  items: [:],
  isAnimated: true,
  iPhonePresentationStyle: .fullScreen,
  iPadPresentationStyle: .pageSheet,
  prefersLargeTitles: .none)

• forcely reload the last page behind the modal. This is useful when you need to call the onAppear(perform:) again.

  navigator.rootReloadLast(items: [:], isAnimated: false)

- Example

LinkNavigator provides 2 Example Apps.

• MVI based example
• TCA based example - with 0.50.1 release

- Getting Started

Step 1

• To install LinkNavigator in your SwiftUI project, you need to implement 4 files.
• You can freely edit the type names. In the following examples, simple names are used for clarity.

• Describe in order: AppDependency -> AppRouterGroup -> AppDelegate -> AppMain

  // AppDependency.swift
  // A type that manages external dependencies.
  
  import LinkNavigator
  
  struct AppDependency: DependencyType { } // you need to adopt DependencyType protocol here.

  // AppRouterGroup.swift
  // A type that manages the pages you want to go with LinkNavigator.
  
  import LinkNavigator
  
  struct AppRouterGroup {
  var routers: [RouteBuilder] {
    [
      HomeRouteBuilder(), // to be implemented in Step 3
      Page1RouteBuilder(),
      Page2RouteBuilder(),
      Page3RouteBuilder(),
      Page4RouteBuilder(),
    ]
  }
  }

  // AppDelegate.swift
  // A type that manages the navigator injected with external dependencies and pages.
  
  import SwiftUI
  import LinkNavigator
  
  final class AppDelegate: NSObject {
  var navigator: LinkNavigator {
    LinkNavigator(dependency: AppDependency(), builders: AppRouterGroup().routers)
  }
  }
  
  extension AppDelegate: UIApplicationDelegate {
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
    true
  }
  }

  // AppMain.swift
  // A type that sets the starting page of the Application.
  
  import SwiftUI
  import LinkNavigator
  
  @main
  struct AppMain: App {
  @UIApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
  
  var navigator: LinkNavigator {
    appDelegate.navigator
  }
  
  var body: some Scene {
    WindowGroup {
      navigator
        .launch(paths: ["home"], items: [:]) // the argument of 'paths' becomes starting pages.
        .onOpenURL { url in
        // in case you need deep link navigation,
        // deep links should be processed here.
        }
    }
  }
  }

Step 2

• Add a navigator property inside the page struct type, so that it is injected when initialized.

• Depending on the characteristics of the architecture, freely change the position of the navigator property and use it. For example, you can put it in ViewModel or Environment.

  struct HomePage: View {
  let navigator: LinkNavigatorType
  
  var body: some View {
    ...
  }
  }

Step 3

• Create a struct type adopting the RouteBuilder protocol for every page.

• RouteBuilder structs created in this way are collected and managed in the AppRouterGroup type.

  import LinkNavigator
  import SwiftUI
  
  struct HomeRouteBuilder: RouteBuilder {
  var matchPath: String { "home" }
  
  var build: (LinkNavigatorType, [String: String], DependencyType) -> MatchingViewController? {
    { navigator, items, dependency in
      return WrappingController(matchPath: matchPath) {
        HomePage(navigator: navigator)
      }
    }
  }
  }

- Installation

LinkNavigator supports Swift Package Manager.

• File menu at the top of Xcode -> Select Add Packages....
• Enter "https://github.com/interactord/LinkNavigator.git" in the Package URL field to install it.
• or, add the following in the Package.swift.

let package = Package(
  name: "MyPackage",
  products: [
    .library(
      name: "MyPackage",
      targets: ["MyPackage"]),
  ],
  dependencies: [
    .package(url: "https://github.com/interactord/LinkNavigator.git", .upToNextMajor(from: "0.6.1"))
  ],
  targets: [
    .target(
      name: "MyPackage",
      dependencies: ["LinkNavigator"])
  ]
)

- Extra

• Q: How can I use large titles in SwiftUI?

  /// in AppMain.swift (MVI)
  /// To use for route navigation, set the prefersLargeTitles parameter to true in the launch method.
  
  navigator
  .launch(paths: ["home"], items: [:], prefersLargeTitles: true)
  
  /// in HomeView.swift (MVI)
  /// To specify the display mode of the navigation bar title, use the navigationBarTitleDisplayMode (.line, .large, .automatic) in the SwiftUI screen of each screen.
  ScrollView {
  ....
  }
  .navigationBarTitleDisplayMode(.large)
  .navigationTitle("Home")
  
  ///  If you want to use it in fullSheet or customSheet,
  /// Home.intent (MVI)
  /// To enable large titles, set the prefersLargeTitles variable to true. To maintain the current settings, use .none.
  navigator.fullSheet(paths: ["page1", "page2"], items: [:], isAnimated: true, prefersLargeTitles: true)

• Q: I'm wondering how to apply IgnoringSafeArea to a specific part or the entire screen if I want to?

  1. Add the following code to the screen where LinkNavigator is first started (example: AppMain.swift).
  2. Then, add the following example code. (Refer to the AppMain.swift example.)

  navigator .launch(paths: ["home"], items: [:], prefersLargeTitles: true) /// - Note: /// If you are using the ignoresSafeArea property to ignore the safe area on an internal screen, /// please add the corresponding code to the part where you first execute the LinkNavigator. .ignoresSafeArea()

- Q: In the view controller, I need to handle various tasks such as navigation or calling Firebase events when calling the screen. How should I handle it?

  - You can customize the WrappingController. I will provide an example code for customization.
```swift 
import SwiftUI
public final class DebugWrappingViewController<Content: View>: UIHostingController<Content>, MatchPathUsable {

  // MARK: Lifecycle

  public init(
    matchPath: String,
    trackEventUseCase: TrackEventUseCase,
    @ViewBuilder content: () -> Content)
  {
    self.matchPath = matchPath
    self.eventSubscriber = eventSubscriber
    self.trackEventUseCase = trackEventUseCase
    super.init(rootView: content())
  }

  required init?(coder _: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  deinit {
    print("✂️ \(matchPath) deinit...")
  }

  // MARK: Public

  public let matchPath: String

  public override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = SystemColor.Background.Default.Base.getColor()
    print("🚗 \(matchPath)")
    trackEventUseCase.sendEvent(.screen(matchPath))
  }

  // MARK: Private

  private let trackEventUseCase: TrackEventUseCase
}

- License

This library is released under the MIT license. See LICENSE for details.