diff --git a/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm b/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm
index 78ddc45602375..29a5930cae018 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm
+++ b/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm
@@ -1598,6 +1598,8 @@ - (CGRect)localRectFromFrameworkTransform:(CGRect)incomingRect {
 // and to position the
 // candidates view for multi-stage input methods (e.g., Japanese) when using a
 // physical keyboard.
+// Returns the rect for the queried range, or a subrange through the end of line, if
+// the range encompasses multiple lines.
 - (CGRect)firstRectForRange:(UITextRange*)range {
   NSAssert([range.start isKindOfClass:[FlutterTextPosition class]],
            @"Expected a FlutterTextPosition for range.start (got %@).", [range.start class]);
@@ -1652,6 +1654,14 @@ - (CGRect)firstRectForRange:(UITextRange*)range {
   if (end < start) {
     first = end;
   }
+
+  CGRect startSelectionRect = CGRectNull;
+  CGRect endSelectionRect = CGRectNull;
+  // Selection rects from different langauges may have different minY/maxY.
+  // So we need to iterate through each rects to update minY/maxY.
+  CGFloat minY = CGFLOAT_MAX;
+  CGFloat maxY = CGFLOAT_MIN;
+
   FlutterTextRange* textRange = [FlutterTextRange
       rangeWithNSRange:fml::RangeForCharactersInRange(self.text, NSMakeRange(0, self.text.length))];
   for (NSUInteger i = 0; i < [_selectionRects count]; i++) {
@@ -1662,11 +1672,38 @@ - (CGRect)firstRectForRange:(UITextRange*)range {
         !isLastSelectionRect && _selectionRects[i + 1].position > first;
     if (startsOnOrBeforeStartOfRange &&
         (endOfTextIsAfterStartOfRange || nextSelectionRectIsAfterStartOfRange)) {
-      return _selectionRects[i].rect;
+      // TODO(hellohaunlin): Remove iOS 17 check. The logic should also work for older versions.
+      if (@available(iOS 17, *)) {
+        startSelectionRect = _selectionRects[i].rect;
+      } else {
+        return _selectionRects[i].rect;
+      }
+    }
+    if (!CGRectIsNull(startSelectionRect)) {
+      minY = fmin(minY, CGRectGetMinY(_selectionRects[i].rect));
+      maxY = fmax(maxY, CGRectGetMaxY(_selectionRects[i].rect));
+      BOOL endsOnOrAfterEndOfRange = _selectionRects[i].position >= end - 1;  // end is exclusive
+      BOOL nextSelectionRectIsOnNextLine =
+          !isLastSelectionRect &&
+          // Selection rects from different langauges in 2 lines may overlap with each other.
+          // A good approximation is to check if the center of next rect is below the bottom of
+          // current rect.
+          // TODO(hellohuanlin): Consider passing the line break info from framework.
+          CGRectGetMidY(_selectionRects[i + 1].rect) > CGRectGetMaxY(_selectionRects[i].rect);
+      if (endsOnOrAfterEndOfRange || isLastSelectionRect || nextSelectionRectIsOnNextLine) {
+        endSelectionRect = _selectionRects[i].rect;
+        break;
+      }
     }
   }
-
-  return CGRectZero;
+  if (CGRectIsNull(startSelectionRect) || CGRectIsNull(endSelectionRect)) {
+    return CGRectZero;
+  } else {
+    // fmin/fmax to support both LTR and RTL languages.
+    CGFloat minX = fmin(CGRectGetMinX(startSelectionRect), CGRectGetMinX(endSelectionRect));
+    CGFloat maxX = fmax(CGRectGetMaxX(startSelectionRect), CGRectGetMaxX(endSelectionRect));
+    return CGRectMake(minX, minY, maxX - minX, maxY - minY);
+  }
 }
 
 - (CGRect)caretRectForPosition:(UITextPosition*)position {
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterTextInputPluginTest.mm b/shell/platform/darwin/ios/framework/Source/FlutterTextInputPluginTest.mm
index 1019e35213723..ba4b250d24edf 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterTextInputPluginTest.mm
+++ b/shell/platform/darwin/ios/framework/Source/FlutterTextInputPluginTest.mm
@@ -1438,24 +1438,264 @@ - (void)testUpdateFirstRectForRange {
                                   [inputView firstRectForRange:range]));
 }
 
-- (void)testFirstRectForRangeReturnsCorrectSelectionRect {
+- (void)testFirstRectForRangeReturnsCorrectRectOnASingleLineLeftToRight {
   FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
   [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
 
-  FlutterTextRange* range = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 1)];
-  CGRect testRect = CGRectMake(100, 100, 100, 100);
   [inputView setSelectionRects:@[
     [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:0U],
-    [FlutterTextSelectionRect selectionRectWithRect:testRect position:1U],
-    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 200, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 0, 100, 100) position:1U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 0, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:3U],
   ]];
-  XCTAssertTrue(CGRectEqualToRect(testRect, [inputView firstRectForRange:range]));
+  FlutterTextRange* singleRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 1)];
+  XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 100, 100),
+                                  [inputView firstRectForRange:singleRectRange]));
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 3)];
+
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 300, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 100, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
 
   [inputView setTextInputState:@{@"text" : @"COM"}];
   FlutterTextRange* rangeOutsideBounds = [FlutterTextRange rangeWithNSRange:NSMakeRange(3, 1)];
   XCTAssertTrue(CGRectEqualToRect(CGRectZero, [inputView firstRectForRange:rangeOutsideBounds]));
 }
 
+- (void)testFirstRectForRangeReturnsCorrectRectOnASingleLineRightToLeft {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 0, 100, 100) position:1U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 0, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:3U],
+  ]];
+  FlutterTextRange* singleRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 1)];
+  XCTAssertTrue(CGRectEqualToRect(CGRectMake(200, 0, 100, 100),
+                                  [inputView firstRectForRange:singleRectRange]));
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 3)];
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(0, 0, 300, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(200, 0, 100, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+
+  [inputView setTextInputState:@{@"text" : @"COM"}];
+  FlutterTextRange* rangeOutsideBounds = [FlutterTextRange rangeWithNSRange:NSMakeRange(3, 1)];
+  XCTAssertTrue(CGRectEqualToRect(CGRectZero, [inputView firstRectForRange:rangeOutsideBounds]));
+}
+
+- (void)testFirstRectForRangeReturnsCorrectRectOnMultipleLinesLeftToRight {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 0, 100, 100) position:1U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 0, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:3U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 100, 100, 100) position:4U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 100, 100, 100) position:5U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 100, 100, 100) position:6U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 100, 100, 100) position:7U],
+  ]];
+  FlutterTextRange* singleRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 1)];
+  XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 100, 100),
+                                  [inputView firstRectForRange:singleRectRange]));
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 4)];
+
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 300, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 100, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+}
+
+- (void)testFirstRectForRangeReturnsCorrectRectOnMultipleLinesRightToLeft {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 0, 100, 100) position:1U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 0, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:3U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 100, 100, 100) position:4U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 100, 100, 100) position:5U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 100, 100, 100) position:6U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 100, 100, 100) position:7U],
+  ]];
+  FlutterTextRange* singleRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 1)];
+  XCTAssertTrue(CGRectEqualToRect(CGRectMake(200, 0, 100, 100),
+                                  [inputView firstRectForRange:singleRectRange]));
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 4)];
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(0, 0, 300, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(200, 0, 100, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+}
+
+- (void)testFirstRectForRangeReturnsCorrectRectOnSingleLineWithVaryingMinYAndMaxYLeftToRight {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 10, 100, 80)
+                                           position:1U],  // shorter
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, -10, 100, 120)
+                                           position:2U],  // taller
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:3U],
+  ]];
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 3)];
+
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, -10, 300, 120),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 10, 100, 80),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+}
+
+- (void)testFirstRectForRangeReturnsCorrectRectOnSingleLineWithVaryingMinYAndMaxYRightToLeft {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, -10, 100, 120)
+                                           position:1U],  // taller
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 10, 100, 80)
+                                           position:2U],  // shorter
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:3U],
+  ]];
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 3)];
+
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(0, -10, 300, 120),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(200, -10, 100, 120),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+}
+
+- (void)testFirstRectForRangeReturnsCorrectRectWithOverlappingRectsExceedingThresholdLeftToRight {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 0, 100, 100) position:1U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 0, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:3U],
+    // y=60 exceeds threshold, so treat it as a new line.
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 60, 100, 100) position:4U],
+  ]];
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 4)];
+
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 300, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 100, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+}
+
+- (void)testFirstRectForRangeReturnsCorrectRectWithOverlappingRectsExceedingThresholdRightToLeft {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 0, 100, 100) position:1U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 0, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:3U],
+    // y=60 exceeds threshold, so treat it as a new line.
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 60, 100, 100) position:4U],
+  ]];
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 4)];
+
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(0, 0, 300, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(200, 0, 100, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+}
+
+- (void)testFirstRectForRangeReturnsCorrectRectWithOverlappingRectsWithinThresholdLeftToRight {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 0, 100, 100) position:1U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 0, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:3U],
+    // y=40 is within line threshold, so treat it as the same line
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(400, 40, 100, 100) position:4U],
+  ]];
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 4)];
+
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 400, 140),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(100, 0, 100, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+}
+
+- (void)testFirstRectForRangeReturnsCorrectRectWithOverlappingRectsWithinThresholdRightToLeft {
+  FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
+  [inputView setTextInputState:@{@"text" : @"COMPOSING"}];
+
+  [inputView setSelectionRects:@[
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(400, 0, 100, 100) position:0U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(300, 0, 100, 100) position:1U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(200, 0, 100, 100) position:2U],
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(100, 0, 100, 100) position:3U],
+    // y=40 is within line threshold, so treat it as the same line
+    [FlutterTextSelectionRect selectionRectWithRect:CGRectMake(0, 40, 100, 100) position:4U],
+  ]];
+
+  FlutterTextRange* multiRectRange = [FlutterTextRange rangeWithNSRange:NSMakeRange(1, 4)];
+
+  if (@available(iOS 17, *)) {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(0, 0, 400, 140),
+                                    [inputView firstRectForRange:multiRectRange]));
+  } else {
+    XCTAssertTrue(CGRectEqualToRect(CGRectMake(300, 0, 100, 100),
+                                    [inputView firstRectForRange:multiRectRange]));
+  }
+}
+
 - (void)testClosestPositionToPoint {
   FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
   [inputView setTextInputState:@{@"text" : @"COMPOSING"}];