Add accessibility hints to the digit grouping segmented control

Author: mattrubin

Authenticator/Source/DisplayOptionsViewController.swift

@@ -115,8 +115,8 @@ extension DisplayOptionsViewController {
         return DigitGroupingRowViewModel(
             title: "Digit Grouping",
             options: [
-                (title: "•• •• ••", accessibilityLabel: "Groups of two digits", value: 2),
-                (title: "••• •••", accessibilityLabel: "Groups of three digits", value: 3),
+                (title: "•• •• ••", accessibilityLabel: "Groups of two digits", value: 2, accessibilityHint: "For example, 38 62 47"),
+                (title: "••• •••", accessibilityLabel: "Groups of three digits", value: 3, accessibilityHint: "For example, 386 247"),
             ],
             value: viewModel.digitGroupSize,
             changeAction: DisplayOptions.Effect.setDigitGroupSize
@@ -129,13 +129,13 @@ extension DisplayOptionsViewController {
 // swiftlint:disable large_tuple
 struct DigitGroupingRowViewModel<Action> {
     let title: String
-    let segments: [(title: String, accessibilityLabel: String, action: Action)]
+    let segments: [(title: String, accessibilityLabel: String, accessibilityHint: String, action: Action)]
     let selectedSegmentIndex: Int?
 
-    init<V: Equatable>(title: String, options: [(title: String, accessibilityLabel: String, value: V)], value: V, changeAction: (V) -> Action) {
+    init<V: Equatable>(title: String, options: [(title: String, accessibilityLabel: String, value: V, accessibilityHint: String)], value: V, changeAction: (V) -> Action) {
         self.title = title
         segments = options.map({ option in
-            (title: option.title, accessibilityLabel: option.accessibilityLabel, action: changeAction(option.value))
+            (title: option.title, accessibilityLabel: option.accessibilityLabel, accessibilityHint: option.accessibilityHint, action: changeAction(option.value))
         })
         selectedSegmentIndex = options.map({ $0.value }).index(of: value)
     }
@@ -224,6 +224,7 @@ class DigitGroupingRowCell<Action>: UITableViewCell {
             // This is a hack to set the accessibility label on each segment, but for now it works.
             // If a future iOS update ever changes the internals of UISegmentedControl, this may break horribly.
             segmentedControl.subviews.last?.accessibilityLabel = segment.accessibilityLabel
+            segmentedControl.subviews.last?.accessibilityHint = segment.accessibilityHint
         }
         // Store the action associated with each segment
         actions = viewModel.segments.map({ $0.action })