support accessibilityPerformEscape

PanModal/View/PanContainerView.swift

@@ -15,17 +15,34 @@ import UIKit
  having to do those changes directly on the view
  */
 class PanContainerView: UIView {
+
+    private weak var presentedViewController: UIViewController?
 
     init(presentedView: UIView, frame: CGRect) {
         super.init(frame: frame)
         addSubview(presentedView)
+        presentedViewController = presentedView.parentViewController
     }
 
     @available(*, unavailable)
     required init?(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }
 
+    override func accessibilityPerformEscape() -> Bool {
+        var shouldPerforEscape: Bool = true
+        if let panModalPresentable = presentedViewController as? PanModalPresentable {
+            shouldPerforEscape = panModalPresentable.allowsDragToDismiss || panModalPresentable.allowsTapToDismiss
+            presentedViewController?.dismiss(animated: true, completion: nil)
+        }
+        return shouldPerforEscape
+    }
+}
+
+private extension UIResponder {
+    var parentViewController: UIViewController? {
+        return next as? UIViewController ?? next?.parentViewController
+    }
 }
 
 extension UIView {

Tests/UIAccessiblityPerformEscapeTests.swift

@@ -0,0 +1,43 @@
+//
+//  UIAccessiblityPerformEscapeTests.swift
+//  PanModalTests
+//
+//  Created by Sungdoo on 2022/03/17.
+//  Copyright © 2022 Detail. All rights reserved.
+//
+
+import XCTest
+import PanModal
+
+class UIAccessiblityPerformEscapeTests: XCTestCase {
+
+    class MockViewController: UIViewController, PanModalPresentable {
+        var panScrollable: UIScrollView? { return nil }
+    }
+
+    func testAccessibilityPerformEscape() throws {
+
+        let presenterViewController = UIApplication.shared.keyWindow?.rootViewController
+        let panModal: UIViewController & PanModalPresentable = MockViewController()
+
+        presenterViewController?.presentPanModal(panModal)
+        XCTAssertNotNil(presenterViewController?.presentedViewController, "panModal should have been presented")
+
+        let presentDidFisnish = XCTestExpectation()
+        let dismissDidFinish = XCTestExpectation()
+
+        DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
+
+            let panContainerView = panModal.view.superview
+            presentDidFisnish.fulfill()
+
+            panContainerView?.accessibilityPerformEscape()
+            DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
+                XCTAssertNil(presenterViewController?.presentedViewController, "panModal should have been dismissed")
+                dismissDidFinish.fulfill()
+            }
+        }
+
+        wait(for: [presentDidFisnish, dismissDidFinish], timeout: 10)
+    }
+}