fix(ios): dynamic changes to zIndex not working

renderer/native/ios/renderer/component/text/HippyShadowText.mm

@@ -191,14 +191,11 @@ - (void)contentSizeMultiplierDidChange:(__unused NSNotification *)note {
     [self dirtyText:YES];
 }
 
-- (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<NativeRenderApplierBlock> *)applierBlocks
-                                          parentProperties:(NSDictionary<NSString *, id> *)parentProperties {
+- (void)processUpdatedPropertiesBeforeMount:(NSMutableSet<NativeRenderApplierBlock> *)applierBlocks {
     if ([[self parent] isKindOfClass:[HippyShadowText class]]) {
-        return parentProperties;
+        return;
     }
 
-//    parentProperties = [super processUpdatedProperties:applierBlocks parentProperties:parentProperties];
-
     UIEdgeInsets padding = self.paddingAsInsets;
     CGFloat width = self.frame.size.width - (padding.left + padding.right);
 
@@ -232,7 +229,6 @@ - (void)contentSizeMultiplierDidChange:(__unused NSNotification *)note {
             [(HippyTextView *)parentView performTextUpdate];
         }
     }];
-    return parentProperties;
 }
 
 - (void)amendLayoutBeforeMount:(NSMutableSet<NativeRenderApplierBlock> *)blocks {
@@ -322,7 +318,7 @@ - (void)amendLayoutBeforeMount:(NSMutableSet<NativeRenderApplierBlock> *)blocks
     } @catch (NSException *exception) {
         HippyLogError(@"Exception while doing %s: %@, %@", __func__, exception.description, self);
     }
-    [self processUpdatedProperties:blocks parentProperties:nil];
+    [self processUpdatedPropertiesBeforeMount:blocks];
 }
 
 - (void)applyConfirmedLayoutDirectionToSubviews:(hippy::Direction)confirmedLayoutDirection {

renderer/native/ios/renderer/component/text/HippyText.mm

@@ -80,16 +80,6 @@ - (BOOL)canBeRetrievedFromViewCache {
     return NO;
 }
 
-- (void)hippySetInheritedBackgroundColor:(__unused UIColor *)inheritedBackgroundColor {
-    // mttrn:
-    //	UIColor *backgroundColor = [self rightBackgroundColorOfTheme];
-    //
-    //	if (backgroundColor) {
-    //		self.backgroundColor = backgroundColor;
-    //	} else
-    //  	self.backgroundColor = inheritedBackgroundColor;
-}
-
 - (void)didUpdateHippySubviews {
     // Do nothing, as subviews are managed by `setTextStorage:` method
 }

renderer/native/ios/renderer/component/view/HippyShadowView.h

@@ -142,15 +142,18 @@ typedef void (^HippyViewInsertionBlock)(UIView *container, NSArray<UIView *> *ch
 - (void)setLayoutFrame:(CGRect)frame;
 - (void)setLayoutFrame:(CGRect)frame dirtyPropagation:(BOOL)dirtyPropagation;
 
-/**
- * Process the updated properties and apply them to view. Shadow view classes
- * that add additional propagating properties should override this method.
- */
-- (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<NativeRenderApplierBlock> *)applierBlocks
-                                          parentProperties:(nullable NSDictionary<NSString *, id> *)parentProperties;
 
+/// Called by UIManager before mounting views.
+/// - Parameter blocks: blocks to be executed
 - (void)amendLayoutBeforeMount:(NSMutableSet<NativeRenderApplierBlock> *)blocks;
 
+/// Provide a time to modify the View before mounting,
+/// Call by amendLayoutBeforeMount.
+/// Such as to handle some layout tasks that need to be adjusted independently
+/// after layout engine has completed the layout calculation.
+/// - Parameter applierBlocks: blocks to be executed
+- (void)processUpdatedPropertiesBeforeMount:(NSMutableSet<NativeRenderApplierBlock> *)applierBlocks;
+
 /**
  * Return whether or not this node acts as a leaf node in the eyes of CSSLayout. For example
  * HippyShadowText has children which it does not want CSSLayout to lay out so in the eyes of

renderer/native/ios/renderer/component/view/HippyShadowView.mm

@@ -31,8 +31,6 @@
 #import "HippyRenderUtils.h"
 
 
-static NSString *const HippyBackgroundColorPropKey = @"backgroundColor";
-
 @implementation HippyShadowView
 
 @synthesize hippyTag = _hippyTag;
@@ -45,14 +43,17 @@ - (void)amendLayoutBeforeMount:(NSMutableSet<NativeRenderApplierBlock> *)blocks
     if (NativeRenderUpdateLifecycleComputed == _propagationLifecycle) {
         return;
     }
+
+    // do some additional layout adjust
+    [self processUpdatedPropertiesBeforeMount:blocks];
+
     _propagationLifecycle = NativeRenderUpdateLifecycleComputed;
-    for (HippyShadowView *renderObjectView in self.hippySubviews) {
-        [renderObjectView amendLayoutBeforeMount:blocks];
+    for (HippyShadowView *subShadowView in self.hippySubviews) {
+        [subShadowView amendLayoutBeforeMount:blocks];
     }
 }
 
-- (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<NativeRenderApplierBlock> *)applierBlocks
-                                          parentProperties:(NSDictionary<NSString *, id> *)parentProperties {
+- (void)processUpdatedPropertiesBeforeMount:(NSMutableSet<NativeRenderApplierBlock> *)applierBlocks {
     if (_didUpdateSubviews) {
         _didUpdateSubviews = NO;
         [self didUpdateHippySubviews];
@@ -70,27 +71,6 @@ - (void)amendLayoutBeforeMount:(NSMutableSet<NativeRenderApplierBlock> *)blocks
         }];
         _confirmedLayoutDirectionDidUpdated = NO;
     }
-    if (!_backgroundColor) {
-        UIColor *parentBackgroundColor = parentProperties[HippyBackgroundColorPropKey];
-        if (parentBackgroundColor) {
-            [applierBlocks addObject:^(NSDictionary<NSNumber *, UIView *> *viewRegistry, UIView * _Nullable lazyCreatedView) {
-                UIView *view = lazyCreatedView ?: viewRegistry[self->_hippyTag];
-                [view hippySetInheritedBackgroundColor:parentBackgroundColor];
-            }];
-        }
-    } else {
-        // Update parent properties for children
-        NSMutableDictionary<NSString *, id> *properties = [NSMutableDictionary dictionaryWithDictionary:parentProperties];
-        CGFloat alpha = CGColorGetAlpha(_backgroundColor.CGColor);
-        if (alpha < 1.0) {
-            // If bg is non-opaque, don't propagate further
-            properties[HippyBackgroundColorPropKey] = [UIColor clearColor];
-        } else {
-            properties[HippyBackgroundColorPropKey] = _backgroundColor;
-        }
-        return properties;
-    }
-    return parentProperties;
 }
 
 - (instancetype)init {
@@ -328,6 +308,16 @@ - (void)setBackgroundColor:(UIColor *)color {
     [self dirtyPropagation:NativeRenderUpdateLifecyclePropsDirtied];
 }
 
+- (void)setZIndex:(NSInteger)zIndex {
+    _zIndex = zIndex;
+    HippyShadowView *superShadowView = _superview;
+    if (superShadowView) {
+        // Changing zIndex means the subview order of the parent needs updating
+        superShadowView->_didUpdateSubviews = YES;
+        [superShadowView dirtyPropagation:NativeRenderUpdateLifecycleLayoutDirtied];
+    }
+}
+
 - (void)didUpdateHippySubviews {
     // Does nothing by default
 }

renderer/native/ios/renderer/component/view/HippyView.m

@@ -385,17 +385,6 @@ - (BOOL)getLayerContentForColor:(UIColor *)color completionBlock:(void (^)(UIIma
     return YES;
 }
 
-static BOOL NativeRenderLayerHasShadow(CALayer *layer) {
-    return layer.shadowOpacity * CGColorGetAlpha(layer.shadowColor) > 0;
-}
-
-- (void)hippySetInheritedBackgroundColor:(UIColor *)inheritedBackgroundColor {
-    // Inherit background color if a shadow has been set, as an optimization
-    if (NativeRenderLayerHasShadow(self.layer)) {
-        self.backgroundColor = inheritedBackgroundColor;
-    }
-}
-
 - (void)updateClippingForLayer:(CALayer *)layer {
     CALayer *mask = nil;
     CGFloat cornerRadius = 0;

renderer/native/ios/renderer/component/view/UIView+Hippy.h

@@ -76,11 +76,6 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (void)hippySetFrame:(CGRect)frame;
 
-/**
- * Used to improve performance when compositing views with translucent content.
- */
-- (void)hippySetInheritedBackgroundColor:(UIColor *)inheritedBackgroundColor;
-
 /**
  * This method finds and returns the containing view controller for the view.
  */

renderer/native/ios/renderer/component/view/UIView+Hippy.mm

@@ -286,10 +286,6 @@ - (void)hippySetFrame:(CGRect)frame {
     self.frame = frame;
 }
 
-- (void)hippySetInheritedBackgroundColor:(__unused UIColor *)inheritedBackgroundColor {
-    // Does nothing by default
-}
-
 - (UIViewController *)hippyViewController {
     id responder = [self nextResponder];
     while (responder) {