Fix singleline on Fabric iOS

Author: tomekzaw

ios/MarkdownTextInputDecoratorView.mm

@@ -22,6 +22,7 @@ @implementation MarkdownTextInputDecoratorView {
 #else
   __weak RCTBaseTextInputView *_textInput;
 #endif /* RCT_NEW_ARCH_ENABLED */
+  __weak UIView<RCTBackedTextInputViewProtocol> *_backedTextInputView;
   __weak RCTBackedTextFieldDelegateAdapter *_adapter;
   __weak RCTUITextView *_textView;
 }
@@ -51,24 +52,24 @@ - (void)didMoveToWindow {
 #ifdef RCT_NEW_ARCH_ENABLED
   react_native_assert([view isKindOfClass:[RCTTextInputComponentView class]] && "Previous sibling component is not an instance of RCTTextInputComponentView.");
   _textInput = (RCTTextInputComponentView *)view;
-  UIView<RCTBackedTextInputViewProtocol> *backedTextInputView = [_textInput valueForKey:@"_backedTextInputView"];
+  _backedTextInputView = [_textInput valueForKey:@"_backedTextInputView"];
 #else
   react_native_assert([view isKindOfClass:[RCTBaseTextInputView class]] && "Previous sibling component is not an instance of RCTBaseTextInputView.");
   _textInput = (RCTBaseTextInputView *)view;
-  UIView<RCTBackedTextInputViewProtocol> *backedTextInputView = _textInput.backedTextInputView;
+  _backedTextInputView = _textInput.backedTextInputView;
 #endif /* RCT_NEW_ARCH_ENABLED */
 
   _markdownUtils = [[RCTMarkdownUtils alloc] init];
   react_native_assert(_markdownStyle != nil);
   [_markdownUtils setMarkdownStyle:_markdownStyle];
 
   [_textInput setMarkdownUtils:_markdownUtils];
-  if ([backedTextInputView isKindOfClass:[RCTUITextField class]]) {
-    RCTUITextField *textField = (RCTUITextField *)backedTextInputView;
+  if ([_backedTextInputView isKindOfClass:[RCTUITextField class]]) {
+    RCTUITextField *textField = (RCTUITextField *)_backedTextInputView;
     _adapter = [textField valueForKey:@"textInputDelegateAdapter"];
     [_adapter setMarkdownUtils:_markdownUtils];
-  } else if ([backedTextInputView isKindOfClass:[RCTUITextView class]]) {
-    _textView = (RCTUITextView *)backedTextInputView;
+  } else if ([_backedTextInputView isKindOfClass:[RCTUITextView class]]) {
+    _textView = (RCTUITextView *)_backedTextInputView;
     [_textView setMarkdownUtils:_markdownUtils];
     NSLayoutManager *layoutManager = _textView.layoutManager; // switching to TextKit 1 compatibility mode
     layoutManager.allowsNonContiguousLayout = NO; // workaround for onScroll issue
@@ -103,7 +104,7 @@ - (void)setMarkdownStyle:(RCTMarkdownStyle *)markdownStyle
 
   // apply new styles
 #ifdef RCT_NEW_ARCH_ENABLED
-  [_textInput _setAttributedString:_textInput.attributedText];
+  [_textInput _setAttributedString:_backedTextInputView.attributedText];
 #else
   [_textInput setAttributedText:_textInput.attributedText];
 #endif /* RCT_NEW_ARCH_ENABLED */