SignupMethodVC: Make VO select the first button

Author: shiki

WordPressAuthenticator/Signin/LoginPrologueSignupMethodViewController.swift

@@ -105,6 +105,15 @@ class LoginPrologueSignupMethodViewController: NUXViewController {
 
     private func configureForAccessibility() {
         dismissButton.accessibilityLabel = NSLocalizedString("Dismiss", comment: "Accessibility label for the transparent space above the signup dialog which acts as a button to dismiss the dialog.")
+
+        // Ensure that the first button (in buttonViewController) is automatically selected by
+        // VoiceOver instead of the dismiss button.
+        if buttonViewController?.isViewLoaded == true, let buttonsView = buttonViewController?.view {
+            view.accessibilityElements = [
+                buttonsView,
+                dismissButton
+            ]
+        }
     }
 
     override func accessibilityPerformEscape() -> Bool {