From 6319564e1c1b3d32b9097c007d7d6b519c768e01 Mon Sep 17 00:00:00 2001
From: Adrian Schoenig <adrian@schoenig.me>
Date: Fri, 15 Oct 2021 19:40:41 +1100
Subject: [PATCH] Tell VoiceOver that screen changes when pushing or popping
 (#5)

---
 Sources/TGCardViewController/TGCardViewController.swift | 2 ++
 Sources/TGCardViewController/cards/TGCardView.swift     | 6 ++++++
 Sources/TGCardViewController/cards/TGPageCardView.swift | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/Sources/TGCardViewController/TGCardViewController.swift b/Sources/TGCardViewController/TGCardViewController.swift
index cabecf0..2d4a945 100644
--- a/Sources/TGCardViewController/TGCardViewController.swift
+++ b/Sources/TGCardViewController/TGCardViewController.swift
@@ -984,6 +984,7 @@ extension TGCardViewController {
         self.updateForNewPosition(position: animateTo.position)
         self.updateResponderChainForNewTopCard()
         self.toggleCardWrappers(hide: cardView == nil)
+        UIAccessibility.post(notification: .screenChanged, argument: cardView?.preferredView)
         completionHandler?()
       }
     )
@@ -1141,6 +1142,7 @@ extension TGCardViewController {
         self.updateResponderChainForNewTopCard()
         self.isPopping = false
         self.toggleCardWrappers(hide: newTop?.view == nil)
+        UIAccessibility.post(notification: .screenChanged, argument: topView?.preferredView)
         completionHandler?()
       }
     )
diff --git a/Sources/TGCardViewController/cards/TGCardView.swift b/Sources/TGCardViewController/cards/TGCardView.swift
index 1ddea3b..7d6842b 100644
--- a/Sources/TGCardViewController/cards/TGCardView.swift
+++ b/Sources/TGCardViewController/cards/TGCardView.swift
@@ -70,6 +70,12 @@ public class TGCardView: TGCornerView {
     return scrollView.frame.minY
   }
   
+  /// The preferred view to select using VoiceOver or similar technologies
+  /// when this card appears.
+  public var preferredView: UIView {
+    titleView ?? self
+  }
+  
   override public func awakeFromNib() {
     super.awakeFromNib()
     
diff --git a/Sources/TGCardViewController/cards/TGPageCardView.swift b/Sources/TGCardViewController/cards/TGPageCardView.swift
index 0d76e1b..4d0f216 100644
--- a/Sources/TGCardViewController/cards/TGPageCardView.swift
+++ b/Sources/TGCardViewController/cards/TGPageCardView.swift
@@ -38,6 +38,10 @@ class TGPageCardView: TGCardView {
     (contentView.subviews as? [TGCardView]) ?? []
   }
   
+  override var preferredView: UIView {
+    cardViews.first?.preferredView ?? self
+  }
+  
   override var grabHandles: [TGGrabHandleView] {
     cardViews.compactMap { $0.grabHandle }
   }