From 35fe03a11db69c376aa09d4dc67928b3f71692fa Mon Sep 17 00:00:00 2001
From: kirillzyusko <zyusko.kirik@gmail.com>
Date: Tue, 14 Jan 2025 14:36:53 +0100
Subject: [PATCH] fix: selection coordinates on iOS

---
 .../KCTextInputCompositeDelegate.swift        | 45 ++++++++++---------
 ios/protocols/TextInput.swift                 |  1 +
 2 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/ios/delegates/KCTextInputCompositeDelegate.swift b/ios/delegates/KCTextInputCompositeDelegate.swift
index 4f0b73929..bdb469a05 100644
--- a/ios/delegates/KCTextInputCompositeDelegate.swift
+++ b/ios/delegates/KCTextInputCompositeDelegate.swift
@@ -5,30 +5,35 @@
 //  Created by Kiryl Ziusko on 24/04/2024.
 //
 
+import CoreText
 import Foundation
 
 func textSelection(in textInput: UITextInput) -> NSDictionary? {
-  if let selectedRange = textInput.selectedTextRange {
-    let caretRectStart = textInput.caretRect(for: selectedRange.start)
-    let caretRectEnd = textInput.caretRect(for: selectedRange.end)
-
-    return [
-      "selection": [
-        "start": [
-          "x": caretRectStart.origin.x,
-          "y": caretRectStart.origin.y,
-          "position": textInput.offset(from: textInput.beginningOfDocument, to: selectedRange.start),
-        ],
-        "end": [
-          "x": caretRectEnd.origin.x + caretRectEnd.size.width,
-          "y": caretRectEnd.origin.y + caretRectEnd.size.height,
-          "position": textInput.offset(from: textInput.beginningOfDocument, to: selectedRange.end),
-        ],
+  guard let selectedRange = textInput.selectedTextRange,
+        let input = textInput as? TextInput,
+        let font = input.font
+  else { return nil }
+
+  let caretRectStart = textInput.caretRect(for: selectedRange.start)
+  let caretRectEnd = textInput.caretRect(for: selectedRange.end)
+
+  let ctFont = CTFontCreateWithName(font.fontName as CFString, font.pointSize, nil)
+  let ascent = CTFontGetAscent(ctFont)
+
+  return [
+    "selection": [
+      "start": [
+        "x": caretRectStart.origin.x,
+        "y": caretRectStart.origin.y,
+        "position": textInput.offset(from: textInput.beginningOfDocument, to: selectedRange.start),
       ],
-    ]
-  }
-
-  return nil
+      "end": [
+        "x": caretRectEnd.origin.x + caretRectEnd.size.width,
+        "y": caretRectEnd.origin.y + caretRectEnd.size.height + ascent,
+        "position": textInput.offset(from: textInput.beginningOfDocument, to: selectedRange.end),
+      ],
+    ],
+  ]
 }
 
 func updateSelectionPosition(textInput: UITextInput, sendEvent: (_ event: NSDictionary) -> Void) {
diff --git a/ios/protocols/TextInput.swift b/ios/protocols/TextInput.swift
index 57ff04a36..99f428159 100644
--- a/ios/protocols/TextInput.swift
+++ b/ios/protocols/TextInput.swift
@@ -14,6 +14,7 @@ public protocol TextInput: UIView {
   var inputView: UIView? { get set }
   var keyboardType: UIKeyboardType { get }
   var keyboardAppearance: UIKeyboardAppearance { get }
+  var font: UIFont? { get }
   func focus()
 }