Customize modal presentation style via modal-style

In the path configuration, set "modal-style" to:

* "medium" to present a small, half-screen modal.
* "large" to present a normal sized modal, filling the screen.
* "full" to present a modal that can't be swiped to dismiss.

If the property is missing or doesn't exactly match one of these three
options then `large` is used.

Source/Turbo Navigator/Extensions/UINavigationControllerExtension.swift

@@ -5,4 +5,20 @@ extension UINavigationController {
  let viewControllers = viewControllers.dropLast()
  setViewControllers(viewControllers + [viewController], animated: false)
  }
+
+ func setModalPresentationStyle(via proposal: VisitProposal) {
+ switch proposal.modalStyle {
+ case .medium:
+ modalPresentationStyle = .automatic
+ if #available(iOS 15.0, *) {
+ if let sheet = sheetPresentationController {
+ sheet.detents = [.medium(), .large()]
+ }
+ }
+ case .large:
+ modalPresentationStyle = .automatic
+ case .full:
+ modalPresentationStyle = .fullScreen
+ }
+ }
 }

Source/Turbo Navigator/Extensions/VisitProposalExtension.swift

@@ -1,3 +1,5 @@
+import UIKit
+
 public extension VisitProposal {
  var context: TurboNavigation.Context {
  if let rawValue = properties["context"] as? String {
@@ -13,6 +15,13 @@ public extension VisitProposal {
  return .default
  }
 
+ var modalStyle: TurboNavigation.ModalStyle {
+ if let rawValue = properties["modal-style"] as? String {
+ return TurboNavigation.ModalStyle(rawValue: rawValue) ?? .large
+ }
+ return .large
+ }
+
  /// Used to identify a custom native view controller if provided in the path configuration properties of a given pattern.
  ///
  /// For example, given the following configuration file:

Source/Turbo Navigator/Helpers/TurboNavigation.swift

@@ -13,4 +13,10 @@ public enum TurboNavigation {
  case replaceRoot = "replace_root"
  case none
  }
+
+ public enum ModalStyle: String {
+ case medium
+ case large
+ case full
+ }
 }

Source/Turbo Navigator/TurboNavigationHierarchyController.swift

@@ -18,8 +18,8 @@ class TurboNavigationHierarchyController {
 
  func navController(for navigationType: NavigationStackType) -> UINavigationController {
  switch navigationType {
-  case .main: navigationController
-  case .modal: modalNavigationController
+ case .main: navigationController
+ case .modal: modalNavigationController
  }
  }
 
@@ -82,6 +82,7 @@ class TurboNavigationHierarchyController {
  pushOrReplace(on: modalNavigationController, with: controller, via: proposal)
  } else {
  modalNavigationController.setViewControllers([controller], animated: true)
+ modalNavigationController.setModalPresentationStyle(via: proposal)
  navigationController.present(modalNavigationController, animated: true)
  }
  if let visitable = controller as? Visitable {
@@ -146,6 +147,7 @@ class TurboNavigationHierarchyController {
  modalNavigationController.replaceLastViewController(with: controller)
  } else {
  modalNavigationController.setViewControllers([controller], animated: false)
+ modalNavigationController.setModalPresentationStyle(via: proposal)
  navigationController.present(modalNavigationController, animated: true)
  }
  if let visitable = controller as? Visitable {