⭐️ Impl: ModalSheetViewControllerLifecycleNotifier

ios/Temp/ModalSheetViewControllerLifecycleNotifier.swift

@@ -0,0 +1,226 @@
+//
+//  ModalSheetViewControllerLifecycleNotifier.swift
+//  react-native-ios-modal
+//
+//  Created by Dominic Go on 9/27/24.
+//
+
+import UIKit
+import DGSwiftUtilities
+
+
+open class ModalSheetViewControllerLifecycleNotifier: ViewControllerLifecycleNotifier {
+
+  private var _didSetup = false;
+
+  private(set) public var sheetLifecycleEventDelegates:
+    MulticastDelegate<SheetViewControllerEventsNotifiable> = .init();
+
+  /// The return value used for
+  /// `UIAdaptivePresentationControllerDelegate.presentationControllerShouldDismiss`
+  ///
+  public var shouldAllowDismissal = true;
+
+  /// Will receive `UIAdaptivePresentationControllerDelegate` invocations
+  /// that were not handled by this class
+  ///
+  public var presentationControllerDelegateProxy: UIAdaptivePresentationControllerDelegate?;
+
+  public weak var sheetGesture: UIPanGestureRecognizer?;
+  public weak var sheetDropShadowView: UIView?;
+
+  // MARK: - View Controller Lifecycle
+  // ---------------------------------
+
+  public override func viewDidLoad() {
+    super.viewDidLoad();
+    self.setupIfNeeded();
+  };
+
+  public override func viewWillAppear(_ animated: Bool) {
+    super.viewWillAppear(animated);
+  };
+
+  // MARK: - Setup
+  // -------------
+
+  public func setupIfNeeded(){
+    guard !self._didSetup,
+          let presentationController = self.presentationController
+    else {
+      return;
+    };
+
+    if presentationController.delegate != nil {
+      self.presentationControllerDelegateProxy = self;
+    };
+
+    self._setupSheetGesture();
+
+    presentationController.delegate = self;
+    self._didSetup = true;
+  };
+
+  private func _setupSheetGesture(){
+    guard let closestSheetPanGesture = self.closestSheetPanGesture else {
+      return;
+    };
+
+    closestSheetPanGesture.addTarget(
+      self,
+      action: #selector(Self._handleSheetGesture(_:))
+    );
+
+    self.sheetGesture = closestSheetPanGesture;
+  };
+
+  // MARK: - Methods
+  // ---------------
+
+  public override func addEventDelegate(_ delegate: AnyObject){
+    super.addEventDelegate(delegate);
+    guard let delegate = delegate as? SheetViewControllerEventsNotifiable else {
+      return;
+    };
+
+    self.sheetLifecycleEventDelegates.add(delegate);
+  };
+
+  @objc
+  private func _handleSheetGesture(_ panGesture: UIPanGestureRecognizer){
+    guard let presentationController = self.presentationController,
+          let presentedView = presentationController.presentedView
+    else {
+      return;
+    };
+
+    let gesturePoint = panGesture.translation(in: presentedView);
+
+    self.sheetLifecycleEventDelegates.invoke {
+      $0.notifyOnSytemSheetPanGestureInvoked(
+        sender: self,
+        panGesture: panGesture,
+        gesturePoint: gesturePoint
+      );
+    };
+  };
+};
+
+extension ModalSheetViewControllerLifecycleNotifier: UIAdaptivePresentationControllerDelegate {
+
+  public func adaptivePresentationStyle(
+    for controller: UIPresentationController
+  ) -> UIModalPresentationStyle {
+
+    if let delegate = self.presentationControllerDelegateProxy,
+       let presentationStyle = delegate.adaptivePresentationStyle?(for: controller)
+    {
+      return presentationStyle;
+    };
+
+    return .pageSheet;
+  };
+
+  public func adaptivePresentationStyle(
+    for controller: UIPresentationController,
+    traitCollection: UITraitCollection
+  ) -> UIModalPresentationStyle {
+
+    if let delegate = self.presentationControllerDelegateProxy,
+       let presentationStyle = delegate.adaptivePresentationStyle?(for: controller, traitCollection: traitCollection)
+    {
+      return presentationStyle;
+    };
+
+    return .none;
+  };
+
+  @available(iOS 15.0, *)
+  public func presentationController(
+    _ presentationController: UIPresentationController,
+    prepare adaptivePresentationController: UIPresentationController
+  ) {
+    self.presentationControllerDelegateProxy?.presentationController?(
+      presentationController,
+      prepare: adaptivePresentationController
+    );
+  };
+
+  public func presentationController(
+    _ controller: UIPresentationController,
+    viewControllerForAdaptivePresentationStyle style: UIModalPresentationStyle
+  ) -> UIViewController? {
+
+    return self.presentationControllerDelegateProxy?.presentationController?(
+      controller,
+      viewControllerForAdaptivePresentationStyle: style
+    );
+  };
+
+  public func presentationController(
+    _ presentationController: UIPresentationController,
+    willPresentWithAdaptiveStyle style: UIModalPresentationStyle,
+    transitionCoordinator: UIViewControllerTransitionCoordinator?
+  ) {
+
+    self.presentationControllerDelegateProxy?.presentationController?(
+      presentationController,
+      willPresentWithAdaptiveStyle: style,
+      transitionCoordinator: transitionCoordinator
+    );
+  };
+
+  public func presentationControllerShouldDismiss(
+    _ presentationController: UIPresentationController
+  ) -> Bool {
+
+    let shouldDismiss: Bool? =
+      self.presentationControllerDelegateProxy?.presentationControllerShouldDismiss?(presentationController);
+
+    return shouldDismiss ?? self.shouldAllowDismissal;
+  };
+
+  public func presentationControllerWillDismiss(
+    _ presentationController: UIPresentationController
+  ) {
+    self.presentationControllerDelegateProxy?
+      .presentationControllerWillDismiss?(presentationController);
+
+    self.sheetLifecycleEventDelegates.invoke {
+      $0.notifyOnSheetWillDismissViaGesture(
+        sender: self,
+        presentationController: presentationController
+      );
+    };
+  };
+
+  public func presentationControllerDidDismiss(
+    _ presentationController: UIPresentationController
+  ) {
+
+    self.presentationControllerDelegateProxy?
+      .presentationControllerDidDismiss?(presentationController);
+
+    self.sheetLifecycleEventDelegates.invoke {
+      $0.notifyOnSheetDidDismissViaGesture(
+        sender: self,
+        presentationController: presentationController
+      );
+    };
+  };
+
+  public func presentationControllerDidAttemptToDismiss(
+    _ presentationController: UIPresentationController
+  ) {
+
+    self.presentationControllerDelegateProxy?
+      .presentationControllerDidAttemptToDismiss?(presentationController);
+
+    self.sheetLifecycleEventDelegates.invoke {
+      $0.notifyOnSheetDidAttemptToDismissViaGesture(
+        sender: self,
+        presentationController: presentationController
+      );
+    };
+  };
+};