VoiceOver improvements on fast account switcher

Closes #310

Tusker/Screens/Fast Account Switcher/FastAccountSwitcherViewController.swift

@@ -42,6 +42,8 @@ class FastAccountSwitcherViewController: UIViewController {
 
         view.isHidden = true
         
+        view.accessibilityViewIsModal = true
+        
         view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTap(_:))))
         accountsStack.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:))))
     }
@@ -67,10 +69,16 @@ class FastAccountSwitcherViewController: UIViewController {
         
         view.isHidden = false
         
+        func completion() {
+            UIAccessibility.post(notification: .screenChanged, argument: accountViews.first)
+        }
+        
         if UIAccessibility.prefersCrossFadeTransitions {
             view.alpha = 0
             UIView.animate(withDuration: 0.2, delay: 0, options: [.curveEaseInOut, .allowUserInteraction]) {
                 self.view.alpha = 1
+            } completion: { _ in
+                completion()
             }
         } else {
             let totalDuration: TimeInterval = 0.5
@@ -95,6 +103,8 @@ class FastAccountSwitcherViewController: UIViewController {
                         accountView.transform = .identity
                     }
                 }
+            } completion: { _ in
+                completion()
             }
         }
     }
@@ -114,6 +124,8 @@ class FastAccountSwitcherViewController: UIViewController {
             self.view.isHidden = true
             completion?()
             self.view.removeFromSuperview()
+            
+            UIAccessibility.post(notification: .screenChanged, argument: nil)
         }
     }
     
@@ -272,6 +284,14 @@ class FastAccountSwitcherViewController: UIViewController {
         super.touchesBegan(touches, with: event)
     }
     
+    override func accessibilityPerformEscape() -> Bool {
+        guard !view.isHidden else {
+            return false
+        }
+        hide()
+        return true
+    }
+
 }
 
 extension FastAccountSwitcherViewController {

Tusker/Screens/Fast Account Switcher/FastSwitchingAccountView.swift

@@ -117,6 +117,8 @@ class FastSwitchingAccountView: UIView {
         }
         
         updateLabelColors()
+        
+        isAccessibilityElement = true
     }
     
     private func setupAccount(account: LocalData.UserAccountInfo) {
@@ -134,12 +136,16 @@ class FastSwitchingAccountView: UIView {
                 }
             }
         }
+        
+        accessibilityLabel = "\(account.username!)@\(account.instanceURL.host!)"
     }
     
     private func setupPlaceholder() {
         usernameLabel.text = "Add Account"
         instanceLabel.isHidden = true
         avatarImageView.image = UIImage(systemName: "plus")
+        
+        accessibilityLabel = "Add Account"
     }
     
     private func updateLabelColors() {