[HOLD facebook/react-native#37465] Fix TextInput vertical alignment issue when using lineHeight prop on iOS (Paper - old arch)

packages/react-native/Libraries/Text/RCTTextAttributes.m

@@ -130,9 +130,13 @@ - (NSParagraphStyle *)effectiveParagraphStyle
 
   if (!isnan(_lineHeight)) {
     CGFloat lineHeight = _lineHeight * self.effectiveFontSizeMultiplier;
-    paragraphStyle.minimumLineHeight = lineHeight;
-    paragraphStyle.maximumLineHeight = lineHeight;
-    isParagraphStyleUsed = YES;
+
+    // Text with lineHeight lower than font.lineHeight does not correctly vertically align.
+    if (lineHeight > self.effectiveFont.lineHeight) {
+      paragraphStyle.minimumLineHeight = lineHeight;
+      paragraphStyle.maximumLineHeight = lineHeight;
+      isParagraphStyleUsed = YES;
+    }
   }
 
   if (isParagraphStyleUsed) {
@@ -172,6 +176,12 @@ - (NSParagraphStyle *)effectiveParagraphStyle
   NSParagraphStyle *paragraphStyle = [self effectiveParagraphStyle];
   if (paragraphStyle) {
     attributes[NSParagraphStyleAttributeName] = paragraphStyle;
+
+    // The baseline aligns the text vertically in the line height (_UITextLayoutFragmentView).
+    if (!isnan(paragraphStyle.maximumLineHeight) && paragraphStyle.maximumLineHeight >= font.lineHeight) {
+      CGFloat baseLineOffset = (paragraphStyle.maximumLineHeight - font.lineHeight) / 2.0;
+      attributes[NSBaselineOffsetAttributeName] = @(baseLineOffset);
+    }
   }
 
   // Decoration

packages/react-native/Libraries/Text/TextInput/Multiline/RCTUITextView.h

@@ -26,6 +26,9 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, assign, readonly) BOOL textWasPasted;
 @property (nonatomic, copy, nullable) NSString *placeholder;
 @property (nonatomic, strong, nullable) UIColor *placeholderColor;
+@property (nonatomic, assign) CGRect fragmentViewContainerBounds;
+@property (nonatomic, assign) UIEdgeInsets textBorderInsets;
+@property (nonatomic, assign) UIControlContentVerticalAlignment contentVerticalAlignment;
 
 @property (nonatomic, assign) CGFloat preferredMaxLayoutWidth;
 

packages/react-native/Libraries/Text/TextInput/Multiline/RCTUITextView.m

@@ -169,6 +169,15 @@ - (void)paste:(id)sender
   [super paste:sender];
 }
 
+- (void)setTextBorderInsetsAndFrame:(CGRect)bounds textBorderInsets:(UIEdgeInsets)textBorderInsets
+{
+  _textBorderInsets = textBorderInsets;
+
+  // We apply `borderInsets` as the `RCTUITextView` layout offset.
+  self.frame = UIEdgeInsetsInsetRect(bounds, textBorderInsets);
+  [self setNeedsLayout];
+}
+
 // Turn off scroll animation to fix flaky scrolling.
 // This is only necessary for iOS <= 13.
 #if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED < 140000

packages/react-native/Libraries/Text/TextInput/RCTBackedTextInputViewProtocol.h

@@ -34,6 +34,8 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, assign, readonly) CGFloat zoomScale;
 @property (nonatomic, assign, readonly) CGPoint contentOffset;
 @property (nonatomic, assign, readonly) UIEdgeInsets contentInset;
+@property (nonatomic, assign) CGRect fragmentViewContainerBounds;
+@property (nonatomic, assign) UIControlContentVerticalAlignment contentVerticalAlignment;
 
 // This protocol disallows direct access to `selectedTextRange` property because
 // unwise usage of it can break the `delegate` behavior. So, we always have to
@@ -42,6 +44,7 @@ NS_ASSUME_NONNULL_BEGIN
 // If the change was a result of user actions (like typing or touches), we MUST notify the delegate.
 - (void)setSelectedTextRange:(nullable UITextRange *)selectedTextRange NS_UNAVAILABLE;
 - (void)setSelectedTextRange:(nullable UITextRange *)selectedTextRange notifyDelegate:(BOOL)notifyDelegate;
+- (void)setTextBorderInsetsAndFrame:(CGRect)bounds textBorderInsets:(UIEdgeInsets)textBorderInsets;
 
 // This protocol disallows direct access to `text` property because
 // unwise usage of it can break the `attributeText` behavior.

packages/react-native/Libraries/Text/TextInput/RCTBaseTextInputShadowView.m

@@ -177,6 +177,27 @@ - (void)uiManagerWillPerformMounting
 
     baseTextInputView.textAttributes = textAttributes;
     baseTextInputView.reactBorderInsets = borderInsets;
+
+    // The CALayer _UITextLayoutFragmentView does not align correctly 
+    // when adding paragraphStyle.maximumLineHeight to an iOS UITextField (issue #28012).
+    if (!isnan(textAttributes.lineHeight) && !isnan(textAttributes.effectiveFont.lineHeight)) {
+      CGFloat effectiveLineHeight = textAttributes.lineHeight * textAttributes.effectiveFontSizeMultiplier;
+      CGFloat fontLineHeight = textAttributes.effectiveFont.lineHeight;
+      if (effectiveLineHeight >= fontLineHeight * 2.0) {
+        CGFloat height = self.layoutMetrics.frame.size.height;
+        CGFloat width =  self.layoutMetrics.frame.size.width;
+
+        // Setting contentVerticalAlignment to UIControlContentVerticalAlignmentTop aligns 
+        // _UITextLayoutFragmentView and UITextField on the same ordinate (y coordinate).
+        baseTextInputView.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
+
+        // Align vertically _UITextLayoutFragmentView in the center of the UITextField (TextInput).
+        CGFloat padding = (height - effectiveLineHeight) / 2.0;
+        baseTextInputView.fragmentViewContainerBounds = CGRectMake(0, padding, width, effectiveLineHeight);
+      }
+    } else {
+      baseTextInputView.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
+    }
     baseTextInputView.reactPaddingInsets = paddingInsets;
 
     if (newAttributedText) {

packages/react-native/Libraries/Text/TextInput/RCTBaseTextInputView.h

@@ -31,6 +31,8 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, strong, nullable) RCTTextAttributes *textAttributes;
 @property (nonatomic, assign) UIEdgeInsets reactPaddingInsets;
 @property (nonatomic, assign) UIEdgeInsets reactBorderInsets;
+@property (nonatomic, assign) CGRect fragmentViewContainerBounds;
+@property (nonatomic, assign) UIControlContentVerticalAlignment contentVerticalAlignment;
 
 @property (nonatomic, copy, nullable) RCTDirectEventBlock onContentSizeChange;
 @property (nonatomic, copy, nullable) RCTDirectEventBlock onSelectionChange;

packages/react-native/Libraries/Text/TextInput/RCTBaseTextInputView.m

@@ -76,6 +76,22 @@ - (void)enforceTextAttributesIfNeeded
   backedTextInputView.defaultTextAttributes = textAttributes;
 }
 
+// Fixes iOS alignment issue caused by adding paragraphStyle.maximumLineHeight to an iOS UITextField
+// and vertically aligns _UITextLayoutFragmentView with the parent view UITextField.
+- (void)setContentVerticalAlignment:(UIControlContentVerticalAlignment)contentVerticalAlignment
+{
+  _contentVerticalAlignment = contentVerticalAlignment;
+  self.backedTextInputView.contentVerticalAlignment = contentVerticalAlignment;
+}
+
+// Custom bounds used to control vertical position of CALayer _UITextLayoutFragmentView.
+// _UITextLayoutFragmentView is the CALayer of UITextField.
+- (void)setFragmentViewContainerBounds:(CGRect)fragmentViewContainerBounds
+{
+  _fragmentViewContainerBounds = fragmentViewContainerBounds;
+  self.backedTextInputView.fragmentViewContainerBounds = fragmentViewContainerBounds;
+}
+
 - (void)setReactPaddingInsets:(UIEdgeInsets)reactPaddingInsets
 {
   _reactPaddingInsets = reactPaddingInsets;
@@ -87,9 +103,9 @@ - (void)setReactPaddingInsets:(UIEdgeInsets)reactPaddingInsets
 - (void)setReactBorderInsets:(UIEdgeInsets)reactBorderInsets
 {
   _reactBorderInsets = reactBorderInsets;
-  // We apply `borderInsets` as `backedTextInputView` layout offset.
-  self.backedTextInputView.frame = UIEdgeInsetsInsetRect(self.bounds, reactBorderInsets);
-  [self setNeedsLayout];
+
+  // Borders are added using insets (UITextField textRectForBound, UITextView setFrame).
+  [self.backedTextInputView setTextBorderInsetsAndFrame:self.bounds textBorderInsets:reactBorderInsets];
 }
 
 - (NSAttributedString *)attributedText

packages/react-native/Libraries/Text/TextInput/Singleline/RCTUITextField.h

@@ -26,6 +26,8 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, assign, readonly) BOOL textWasPasted;
 @property (nonatomic, strong, nullable) UIColor *placeholderColor;
 @property (nonatomic, assign) UIEdgeInsets textContainerInset;
+@property (nonatomic, assign) CGRect fragmentViewContainerBounds;
+@property (nonatomic, assign) UIEdgeInsets textBorderInsets;
 @property (nonatomic, assign, getter=isEditable) BOOL editable;
 @property (nonatomic, getter=isScrollEnabled) BOOL scrollEnabled;
 @property (nonatomic, strong, nullable) NSString *inputAccessoryViewID;

packages/react-native/Libraries/Text/TextInput/Singleline/RCTUITextField.m

@@ -55,6 +55,12 @@ - (void)setTextContainerInset:(UIEdgeInsets)textContainerInset
   [self setNeedsLayout];
 }
 
+- (void)setTextBorderInsetsAndFrame:(CGRect)bounds textBorderInsets:(UIEdgeInsets)textBorderInsets
+{
+  _textBorderInsets = textBorderInsets;
+  [self setNeedsLayout];
+}
+
 - (void)setPlaceholder:(NSString *)placeholder
 {
   [super setPlaceholder:placeholder];
@@ -157,7 +163,17 @@ - (CGRect)caretRectForPosition:(UITextPosition *)position
 
 - (CGRect)textRectForBounds:(CGRect)bounds
 {
-  return UIEdgeInsetsInsetRect([super textRectForBounds:bounds], _textContainerInset);
+  // Text is vertically aligned to the center.
+  CGFloat leftPadding = _textContainerInset.left + _textBorderInsets.left;
+  CGFloat rightPadding = _textContainerInset.right + _textBorderInsets.right;
+  UIEdgeInsets borderAndPaddingInsets = UIEdgeInsetsMake(_textContainerInset.top, leftPadding, _textContainerInset.bottom, rightPadding);
+  if (self.fragmentViewContainerBounds.size.height > 0) {
+    // Apply custom bounds to fix iOS UITextField issue with lineHeight.
+    // Sets the correct y coordinates for _UITextLayoutFragmentView.
+    return UIEdgeInsetsInsetRect([super textRectForBounds:self.fragmentViewContainerBounds], borderAndPaddingInsets);
+  } else {
+    return UIEdgeInsetsInsetRect([super textRectForBounds:bounds], borderAndPaddingInsets);
+  }
 }
 
 - (CGRect)editingRectForBounds:(CGRect)bounds