Add dismiss notification, make class open, default childScrollView to nil

Author: Semen Osipov

ARBottomSheetViewController/Sources/ARBottomSheetPresentationController.swift

@@ -11,6 +11,7 @@ import SnapKit
 protocol ARBottomSheetPresentationControllerDelegate: AnyObject {
     var preferredControllerHeight: CGFloat {get}
     var interactionScrollView: UIScrollView? {get}
+    func presentationControllerDidDismiss()
 }
 
 class ARBottomSheetPresentationController: UIPresentationController {
@@ -107,6 +108,7 @@ class ARBottomSheetPresentationController: UIPresentationController {
         super.dismissalTransitionDidEnd(completed)
         if completed {
             dimmingView.removeFromSuperview()
+            customDelegate?.presentationControllerDidDismiss()
         }
     }
 

ARBottomSheetViewController/Sources/ARBottomSheetViewController.swift

@@ -11,12 +11,19 @@ import SnapKit
 public protocol ARBottomSheetViewControllerDelegate: AnyObject {
     var contentHeight: CGFloat {get}
     var childScrollView: UIScrollView? {get}
+    func bottomSheetDidDismiss(_ controller: ARBottomSheetViewController)
 }
 
-public class ARBottomSheetViewController: UIViewController {
+public extension ARBottomSheetViewControllerDelegate {
+    var childScrollView: UIScrollView? { nil }
+    func bottomSheetDidDismiss(_ controller: ARBottomSheetViewController) {}
+}
+
+open class ARBottomSheetViewController: UIViewController {
 
     public weak var sheetDelegate: ARBottomSheetViewControllerDelegate?
     public let configuration: ARBottomSheetConfiguration
+    public var onDismiss: (() -> Void)?
 
     // MARK: Views
     private let stickView: UIView = {
@@ -51,7 +58,7 @@ public class ARBottomSheetViewController: UIViewController {
         commonInit()
     }
 
-    required init?(coder: NSCoder) {
+    public required init?(coder: NSCoder) {
         self.configuration = ARBottomSheetConfiguration()
         super.init(coder: coder)
         commonInit()
@@ -116,6 +123,11 @@ extension ARBottomSheetViewController: ARBottomSheetPresentationControllerDelega
         return sheetDelegate?.childScrollView
     }
 
+    func presentationControllerDidDismiss() {
+        sheetDelegate?.bottomSheetDidDismiss(self)
+        onDismiss?()
+    }
+    
     var preferredControllerHeight: CGFloat {
         var handleArea: CGFloat = 0
         if configuration.showsHandle {