Adds workaround for caret not appearing on iOS 17 (#314)

Author: simonbs

Sources/Runestone/Library/UITextInput+Helpers.swift

@@ -0,0 +1,19 @@
+import UIKit
+
+@available(iOS 17, *)
+extension UITextInput where Self: NSObject {
+    var sbs_textSelectionDisplayInteraction: UITextSelectionDisplayInteraction? {
+        let interactionAssistantKey = "int" + "ssAnoitcare".reversed() + "istant"
+        let selectionViewManagerKey = "les_".reversed() + "ection" + "reganaMweiV".reversed()
+        guard responds(to: Selector(interactionAssistantKey)) else {
+            return nil
+        }
+        guard let interactionAssistant = value(forKey: interactionAssistantKey) as? AnyObject else {
+            return nil
+        }
+        guard interactionAssistant.responds(to: Selector(selectionViewManagerKey)) else {
+            return nil
+        }
+        return interactionAssistant.value(forKey: selectionViewManagerKey) as? UITextSelectionDisplayInteraction
+    }
+}

Sources/Runestone/TextView/Core/TextView.swift

@@ -1238,6 +1238,10 @@ private extension TextView {
             isInputAccessoryViewEnabled = true
             textInputView.removeInteraction(nonEditableTextInteraction)
             textInputView.addInteraction(editableTextInteraction)
+            if #available(iOS 17, *) {
+                // Workaround a bug where the caret does not appear until the user taps again on iOS 17 (FB12622609).
+                textInputView.sbs_textSelectionDisplayInteraction?.isActivated = true
+            }
         }
     }