Modify OWSFlatButton to propagate the accessibility identifier to wrapper button.

SignalMessaging/ViewControllers/SelectRecipientViewController.m

@@ -507,8 +507,6 @@ NSString *const kSelectRecipientViewControllerCellIdentifier = @"kSelectRecipien
         UIView *buttonRow = [strongSelf createRowWithHeight:kButtonRowHeight
                                                 previousRow:examplePhoneNumberRow
                                                   superview:cell.contentView];
-        OWSLogVerbose(@"strongSelf.phoneNumberButton: %@", strongSelf.phoneNumberButton.accessibilityIdentifier);
-        OWSLogFlush();
         [buttonRow addSubview:strongSelf.phoneNumberButton];
         [strongSelf.phoneNumberButton autoVCenterInSuperview];
         [strongSelf.phoneNumberButton autoPinTrailingToSuperviewMargin];

SignalMessaging/Views/OWSFlatButton.swift

@@ -15,6 +15,16 @@ public class OWSFlatButton: UIView {
     private var upColor: UIColor?
     private var downColor: UIColor?
 
+    @objc
+    public override var accessibilityIdentifier: String? {
+        didSet {
+            guard let accessibilityIdentifier = self.accessibilityIdentifier else {
+                return
+            }
+            button.accessibilityIdentifier = "\(accessibilityIdentifier).button"
+        }
+    }
+
     override public var backgroundColor: UIColor? {
         willSet {
             owsFailDebug("Use setBackgroundColors(upColor:) instead.")