Fix iOS 15 bars appearance (wix#7270)

Following wix#7266 and especially [my comment there](wix#7266 (comment)), I'm opening this PR to provide a quick fix to people experiencing issues when building RNN using Xcode 13.

This should be considered a fix PR rather than a feature PR, as what it's doing is basically duplicating the already set `standardAppearance` to a `scrollEdgeAppearance`. What this means is that the bars will have the same visual aspect whether they're displayed alongside the edge of a scroll view.

In a future, more elaborate PR, we could imagine a way to be able to provide `scrollEdgeAppearance` values from JS for more control over the native bars.

Fixes wix#7266
Fixes wix#7268

Co-authored-by: Yogev Ben David <yogev132@gmail.com>

lib/ios/BottomTabPresenter.h

@@ -1,7 +1,10 @@
 #import "RNNBasePresenter.h"
-
+#import "RNNTabBarItemCreator.h"
 @interface BottomTabPresenter : RNNBasePresenter
 
+- (instancetype)initWithDefaultOptions:(RNNNavigationOptions *)defaultOptions
+                            tabCreator:(RNNTabBarItemCreator *)tabCreator;
+
 - (void)applyOptions:(RNNNavigationOptions *)options child:(UIViewController *)child;
 
 - (void)applyOptionsOnWillMoveToParentViewController:(RNNNavigationOptions *)options

lib/ios/BottomTabPresenter.m

@@ -3,7 +3,16 @@
 #import "UIViewController+LayoutProtocol.h"
 #import "UIViewController+RNNOptions.h"
 
-@implementation BottomTabPresenter
+@implementation BottomTabPresenter {
+    RNNTabBarItemCreator *_tabCreator;
+}
+
+- (instancetype)initWithDefaultOptions:(RNNNavigationOptions *)defaultOptions
+                            tabCreator:(RNNTabBarItemCreator *)tabCreator {
+    self = [super initWithDefaultOptions:defaultOptions];
+    _tabCreator = tabCreator;
+    return self;
+}
 
 - (void)applyOptions:(RNNNavigationOptions *)options child:(UIViewController *)child {
     RNNNavigationOptions *withDefault = [options withDefault:self.defaultOptions];
@@ -37,8 +46,7 @@ - (void)mergeOptions:(RNNNavigationOptions *)mergeOptions
 
 - (void)createTabBarItem:(UIViewController *)child
         bottomTabOptions:(RNNBottomTabOptions *)bottomTabOptions {
-    child.tabBarItem = [RNNTabBarItemCreator createTabBarItem:bottomTabOptions
-                                                    mergeItem:child.tabBarItem];
+    child.tabBarItem = [_tabCreator createTabBarItem:bottomTabOptions mergeItem:child.tabBarItem];
 }
 
 @end

lib/ios/BottomTabPresenterCreator.m

@@ -1,14 +1,21 @@
 #import "BottomTabPresenterCreator.h"
-#import "BottomTabAppearancePresenter.h"
+#import "RNNTabBarItemCreator.h"
+#import "TabBarItemAppearanceCreator.h"
+#import "TabBarItemIOS15Creator.h"
 
 @implementation BottomTabPresenterCreator
 
 + (BottomTabPresenter *)createWithDefaultOptions:(RNNNavigationOptions *)defaultOptions {
-    if (@available(iOS 13.0, *)) {
-        return [[BottomTabAppearancePresenter alloc] initWithDefaultOptions:defaultOptions];
+    RNNTabBarItemCreator *tabCreator;
+    if (@available(iOS 15.0, *)) {
+        tabCreator = [TabBarItemIOS15Creator new];
+    } else if (@available(iOS 13.0, *)) {
+        tabCreator = [TabBarItemAppearanceCreator new];
     } else {
-        return [[BottomTabPresenter alloc] initWithDefaultOptions:defaultOptions];
+        tabCreator = [RNNTabBarItemCreator new];
     }
+
+    return [[BottomTabPresenter alloc] initWithDefaultOptions:defaultOptions tabCreator:tabCreator];
 }
 
 @end

lib/ios/BottomTabsAppearancePresenter.m

@@ -28,8 +28,14 @@ - (void)applyTabBarBorder:(RNNBottomTabsOptions *)options {
 
 - (void)setTabBarBackgroundColor:(UIColor *)backgroundColor {
     [self setTabBarOpaqueBackground];
-    for (UIViewController *childViewController in self.tabBarController.childViewControllers)
+    for (UIViewController *childViewController in self.tabBarController.childViewControllers) {
         childViewController.tabBarItem.standardAppearance.backgroundColor = backgroundColor;
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 150000
+        if (@available(iOS 15.0, *)) {
+            childViewController.tabBarItem.scrollEdgeAppearance.backgroundColor = backgroundColor;
+        }
+#endif
+    }
 }
 
 - (void)setTabBarTranslucent:(BOOL)translucent {
@@ -46,18 +52,37 @@ - (void)setTabBarDefaultBackground {
 }
 
 - (void)setTabBarTranslucentBackground {
-    for (UIViewController *childViewController in self.tabBarController.childViewControllers)
+    for (UIViewController *childViewController in self.tabBarController.childViewControllers) {
         [childViewController.tabBarItem.standardAppearance configureWithDefaultBackground];
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 150000
+        if (@available(iOS 15.0, *)) {
+            [childViewController.tabBarItem.scrollEdgeAppearance configureWithDefaultBackground];
+        }
+#endif
+    }
 }
 
 - (void)setTabBarTransparentBackground {
-    for (UIViewController *childViewController in self.tabBarController.childViewControllers)
+    for (UIViewController *childViewController in self.tabBarController.childViewControllers) {
         [childViewController.tabBarItem.standardAppearance configureWithTransparentBackground];
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 150000
+        if (@available(iOS 15.0, *)) {
+            [childViewController.tabBarItem
+                    .scrollEdgeAppearance configureWithTransparentBackground];
+        }
+#endif
+    }
 }
 
 - (void)setTabBarOpaqueBackground {
-    for (UIViewController *childViewController in self.tabBarController.childViewControllers)
+    for (UIViewController *childViewController in self.tabBarController.childViewControllers) {
         [childViewController.tabBarItem.standardAppearance configureWithOpaqueBackground];
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 150000
+        if (@available(iOS 15.0, *)) {
+            [childViewController.tabBarItem.scrollEdgeAppearance configureWithOpaqueBackground];
+        }
+#endif
+    }
 }
 
 @end

lib/ios/RNNBottomTabsController.m

@@ -40,6 +40,11 @@ - (instancetype)initWithLayoutInfo:(RNNLayoutInfo *)layoutInfo
     if (@available(iOS 13.0, *)) {
         self.tabBar.standardAppearance = [UITabBarAppearance new];
     }
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 150000
+    if (@available(iOS 15.0, *)) {
+        self.tabBar.scrollEdgeAppearance = [UITabBarAppearance new];
+    }
+#endif
 
     self.longPressRecognizer =
         [[UILongPressGestureRecognizer alloc] initWithTarget:self

lib/ios/RNNTabBarItemCreator.h

@@ -4,14 +4,14 @@
 
 @interface RNNTabBarItemCreator : NSObject
 
-+ (UITabBarItem *)createTabBarItem:(RNNBottomTabOptions *)bottomTabOptions
+- (UITabBarItem *)createTabBarItem:(RNNBottomTabOptions *)bottomTabOptions
                          mergeItem:(UITabBarItem *)mergeItem;
 
-+ (UITabBarItem *)createTabBarItem:(UITabBarItem *)mergeItem;
+- (UITabBarItem *)createTabBarItem:(UITabBarItem *)mergeItem;
 
-+ (void)setTitleAttributes:(UITabBarItem *)tabItem titleAttributes:(NSDictionary *)titleAttributes;
+- (void)setTitleAttributes:(UITabBarItem *)tabItem titleAttributes:(NSDictionary *)titleAttributes;
 
-+ (void)setSelectedTitleAttributes:(UITabBarItem *)tabItem
+- (void)setSelectedTitleAttributes:(UITabBarItem *)tabItem
            selectedTitleAttributes:(NSDictionary *)selectedTitleAttributes;
 
 @end

lib/ios/RNNTabBarItemCreator.m

@@ -4,11 +4,11 @@
 
 @implementation RNNTabBarItemCreator
 
-+ (UITabBarItem *)createTabBarItem:(UITabBarItem *)mergeItem {
+- (UITabBarItem *)createTabBarItem:(UITabBarItem *)mergeItem {
     return [UITabBarItem new];
 }
 
-+ (UITabBarItem *)createTabBarItem:(RNNBottomTabOptions *)bottomTabOptions
+- (UITabBarItem *)createTabBarItem:(RNNBottomTabOptions *)bottomTabOptions
                          mergeItem:(UITabBarItem *)mergeItem {
     UITabBarItem *tabItem = [self createTabBarItem:mergeItem];
     UIImage *icon = [bottomTabOptions.icon withDefault:nil];
@@ -44,7 +44,7 @@ + (UITabBarItem *)createTabBarItem:(RNNBottomTabOptions *)bottomTabOptions
     return tabItem;
 }
 
-+ (UIImage *)getSelectedIconImage:(UIImage *)selectedIcon
+- (UIImage *)getSelectedIconImage:(UIImage *)selectedIcon
                 selectedIconColor:(UIColor *)selectedIconColor {
     if (selectedIcon) {
         if (selectedIconColor) {
@@ -58,7 +58,7 @@ + (UIImage *)getSelectedIconImage:(UIImage *)selectedIcon
     return nil;
 }
 
-+ (UIImage *)getIconImage:(UIImage *)icon withTint:(UIColor *)tintColor {
+- (UIImage *)getIconImage:(UIImage *)icon withTint:(UIColor *)tintColor {
     if (icon) {
         if (tintColor) {
             return [[icon withTintColor:tintColor]
@@ -71,7 +71,7 @@ + (UIImage *)getIconImage:(UIImage *)icon withTint:(UIColor *)tintColor {
     return nil;
 }
 
-+ (void)appendTitleAttributes:(UITabBarItem *)tabItem
+- (void)appendTitleAttributes:(UITabBarItem *)tabItem
              bottomTabOptions:(RNNBottomTabOptions *)bottomTabOptions {
     UIColor *textColor = [bottomTabOptions.textColor withDefault:[UIColor blackColor]];
     UIColor *selectedTextColor =
@@ -97,11 +97,11 @@ + (void)appendTitleAttributes:(UITabBarItem *)tabItem
     [self setTitleAttributes:tabItem titleAttributes:normalAttributes];
 }
 
-+ (void)setTitleAttributes:(UITabBarItem *)tabItem titleAttributes:(NSDictionary *)titleAttributes {
+- (void)setTitleAttributes:(UITabBarItem *)tabItem titleAttributes:(NSDictionary *)titleAttributes {
     [tabItem setTitleTextAttributes:titleAttributes forState:UIControlStateNormal];
 }
 
-+ (void)setSelectedTitleAttributes:(UITabBarItem *)tabItem
+- (void)setSelectedTitleAttributes:(UITabBarItem *)tabItem
            selectedTitleAttributes:(NSDictionary *)selectedTitleAttributes {
     [tabItem setTitleTextAttributes:selectedTitleAttributes forState:UIControlStateSelected];
 }

lib/ios/ReactNativeNavigation.xcodeproj/project.pbxproj

@@ -94,8 +94,6 @@
 		50206A6D21AFE75400B7BB1A /* RNNSideMenuParserTest.m in Sources */ = {isa = PBXBuildFile; fileRef = 50206A6C21AFE75400B7BB1A /* RNNSideMenuParserTest.m */; };
 		5022EDB52405224B00852BA6 /* BottomTabPresenter.h in Headers */ = {isa = PBXBuildFile; fileRef = 5022EDB32405224B00852BA6 /* BottomTabPresenter.h */; };
 		5022EDB62405224B00852BA6 /* BottomTabPresenter.m in Sources */ = {isa = PBXBuildFile; fileRef = 5022EDB42405224B00852BA6 /* BottomTabPresenter.m */; };
-		5022EDB92405226800852BA6 /* BottomTabAppearancePresenter.h in Headers */ = {isa = PBXBuildFile; fileRef = 5022EDB72405226800852BA6 /* BottomTabAppearancePresenter.h */; };
-		5022EDBA2405226800852BA6 /* BottomTabAppearancePresenter.m in Sources */ = {isa = PBXBuildFile; fileRef = 5022EDB82405226800852BA6 /* BottomTabAppearancePresenter.m */; };
 		5022EDBD2405237100852BA6 /* BottomTabPresenterCreator.h in Headers */ = {isa = PBXBuildFile; fileRef = 5022EDBB2405237100852BA6 /* BottomTabPresenterCreator.h */; };
 		5022EDBE2405237100852BA6 /* BottomTabPresenterCreator.m in Sources */ = {isa = PBXBuildFile; fileRef = 5022EDBC2405237100852BA6 /* BottomTabPresenterCreator.m */; };
 		5022EDC124053C9F00852BA6 /* TabBarItemAppearanceCreator.h in Headers */ = {isa = PBXBuildFile; fileRef = 5022EDBF24053C9F00852BA6 /* TabBarItemAppearanceCreator.h */; };
@@ -375,6 +373,8 @@
 		50E5F792223FA04C002AFEAD /* TransitionDetailsOptions.m in Sources */ = {isa = PBXBuildFile; fileRef = 50E5F790223FA04C002AFEAD /* TransitionDetailsOptions.m */; };
 		50E5F7952240EBD6002AFEAD /* RNNAnimationsTransitionDelegate.h in Headers */ = {isa = PBXBuildFile; fileRef = 50E5F7932240EBD6002AFEAD /* RNNAnimationsTransitionDelegate.h */; };
 		50E5F7962240EBD6002AFEAD /* RNNAnimationsTransitionDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 50E5F7942240EBD6002AFEAD /* RNNAnimationsTransitionDelegate.m */; };
+		50E99C422704A7170006D4D1 /* TabBarItemIOS15Creator.h in Headers */ = {isa = PBXBuildFile; fileRef = 50E99C402704A7170006D4D1 /* TabBarItemIOS15Creator.h */; };
+		50E99C432704A7170006D4D1 /* TabBarItemIOS15Creator.m in Sources */ = {isa = PBXBuildFile; fileRef = 50E99C412704A7170006D4D1 /* TabBarItemIOS15Creator.m */; };
 		50EA541623AEDF5D006F881A /* RNNInterpolator.h in Headers */ = {isa = PBXBuildFile; fileRef = 50EA541423AEDF5D006F881A /* RNNInterpolator.h */; };
 		50EA541723AEDF5D006F881A /* RNNInterpolator.m in Sources */ = {isa = PBXBuildFile; fileRef = 50EA541523AEDF5D006F881A /* RNNInterpolator.m */; };
 		50EA541A23AEE1C6006F881A /* AnimatedReactView.h in Headers */ = {isa = PBXBuildFile; fileRef = 50EA541823AEE1C6006F881A /* AnimatedReactView.h */; };
@@ -624,8 +624,6 @@
 		50206A6C21AFE75400B7BB1A /* RNNSideMenuParserTest.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = RNNSideMenuParserTest.m; sourceTree = "<group>"; };
 		5022EDB32405224B00852BA6 /* BottomTabPresenter.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BottomTabPresenter.h; sourceTree = "<group>"; };
 		5022EDB42405224B00852BA6 /* BottomTabPresenter.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = BottomTabPresenter.m; sourceTree = "<group>"; };
-		5022EDB72405226800852BA6 /* BottomTabAppearancePresenter.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BottomTabAppearancePresenter.h; sourceTree = "<group>"; };
-		5022EDB82405226800852BA6 /* BottomTabAppearancePresenter.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = BottomTabAppearancePresenter.m; sourceTree = "<group>"; };
 		5022EDBB2405237100852BA6 /* BottomTabPresenterCreator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BottomTabPresenterCreator.h; sourceTree = "<group>"; };
 		5022EDBC2405237100852BA6 /* BottomTabPresenterCreator.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = BottomTabPresenterCreator.m; sourceTree = "<group>"; };
 		5022EDBF24053C9F00852BA6 /* TabBarItemAppearanceCreator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = TabBarItemAppearanceCreator.h; sourceTree = "<group>"; };
@@ -908,6 +906,8 @@
 		50E5F790223FA04C002AFEAD /* TransitionDetailsOptions.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = TransitionDetailsOptions.m; sourceTree = "<group>"; };
 		50E5F7932240EBD6002AFEAD /* RNNAnimationsTransitionDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = RNNAnimationsTransitionDelegate.h; sourceTree = "<group>"; };
 		50E5F7942240EBD6002AFEAD /* RNNAnimationsTransitionDelegate.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = RNNAnimationsTransitionDelegate.m; sourceTree = "<group>"; };
+		50E99C402704A7170006D4D1 /* TabBarItemIOS15Creator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = TabBarItemIOS15Creator.h; sourceTree = "<group>"; };
+		50E99C412704A7170006D4D1 /* TabBarItemIOS15Creator.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = TabBarItemIOS15Creator.m; sourceTree = "<group>"; };
 		50EA541423AEDF5D006F881A /* RNNInterpolator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = RNNInterpolator.h; sourceTree = "<group>"; };
 		50EA541523AEDF5D006F881A /* RNNInterpolator.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = RNNInterpolator.m; sourceTree = "<group>"; };
 		50EA541823AEE1C6006F881A /* AnimatedReactView.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AnimatedReactView.h; sourceTree = "<group>"; };
@@ -1118,6 +1118,8 @@
 				5038A3BC216E1490009280BC /* RNNTabBarItemCreator.m */,
 				5022EDBF24053C9F00852BA6 /* TabBarItemAppearanceCreator.h */,
 				5022EDC024053C9F00852BA6 /* TabBarItemAppearanceCreator.m */,
+				50E99C402704A7170006D4D1 /* TabBarItemIOS15Creator.h */,
+				50E99C412704A7170006D4D1 /* TabBarItemIOS15Creator.m */,
 				5053CE7D2175FB1900D0386B /* RNNDefaultOptionsHelper.h */,
 				5053CE7E2175FB1900D0386B /* RNNDefaultOptionsHelper.m */,
 				C2A57A1A21E815F80066711C /* InteractivePopGestureDelegate.h */,
@@ -1509,8 +1511,6 @@
 				505C640123E074860078AFC0 /* TopBarTitlePresenter.m */,
 				5022EDB32405224B00852BA6 /* BottomTabPresenter.h */,
 				5022EDB42405224B00852BA6 /* BottomTabPresenter.m */,
-				5022EDB72405226800852BA6 /* BottomTabAppearancePresenter.h */,
-				5022EDB82405226800852BA6 /* BottomTabAppearancePresenter.m */,
 				5022EDC324054C6100852BA6 /* BottomTabsAppearancePresenter.h */,
 				5022EDC424054C6100852BA6 /* BottomTabsAppearancePresenter.m */,
 				5041DC3C2417BBBA0033312F /* BottomTabsBasePresenter.h */,
@@ -1892,7 +1892,6 @@
 				507ACB1123F44D1E00829911 /* RNNComponentView.h in Headers */,
 				B84F6E50252C5ECE007D78A1 /* DecelerateInterpolator.h in Headers */,
 				263905B51E4C6F440023D7D3 /* MMExampleDrawerVisualStateManager.h in Headers */,
-				5022EDB92405226800852BA6 /* BottomTabAppearancePresenter.h in Headers */,
 				50451D052042DAEB00695F00 /* RNNPushAnimation.h in Headers */,
 				507F43C51FF4F17C00D9425B /* RNNTopTabsViewController.h in Headers */,
 				501223D72173590F000F5F98 /* RNNStackPresenter.h in Headers */,
@@ -1987,6 +1986,7 @@
 				50CED449239EA56100C42EE2 /* TopBarPresenterCreator.h in Headers */,
 				5012240E21735999000F5F98 /* RNNBasePresenter.h in Headers */,
 				50495952216F62BD006D2B81 /* NullNumber.h in Headers */,
+				50E99C422704A7170006D4D1 /* TabBarItemIOS15Creator.h in Headers */,
 				5012242221736883000F5F98 /* NullColor.h in Headers */,
 				50CED451239F9DFC00C42EE2 /* TopBarPresenter.h in Headers */,
 				B8415321251E088100467F37 /* LinearInterpolator.h in Headers */,
@@ -2225,6 +2225,7 @@
 				50D3A36F23B8D6C600717F95 /* SharedElementAnimator.m in Sources */,
 				5012242721737278000F5F98 /* NullImage.m in Sources */,
 				5022EDC624054C6100852BA6 /* BottomTabsAppearancePresenter.m in Sources */,
+				50E99C432704A7170006D4D1 /* TabBarItemIOS15Creator.m in Sources */,
 				7B1126A01E2D263F00F9B03B /* RNNEventEmitter.m in Sources */,
 				504189582506144D004A6BC7 /* RNNSetRootAnimator.m in Sources */,
 				A7626BFD1FC2FB2C00492FB8 /* RNNTopBarOptions.m in Sources */,
@@ -2242,7 +2243,6 @@
 				390AD478200F499D00A8250D /* RNNSwizzles.m in Sources */,
 				50E02BD921A6EE0F00A43942 /* SideMenuOpenMode.m in Sources */,
 				503A8A0E23BC9BC50094D1C4 /* ElementVerticalTransition.m in Sources */,
-				5022EDBA2405226800852BA6 /* BottomTabAppearancePresenter.m in Sources */,
 				7BA500751E2544B9001B9E1B /* ReactNativeNavigation.m in Sources */,
 				50E5F7962240EBD6002AFEAD /* RNNAnimationsTransitionDelegate.m in Sources */,
 				5038A3BA216DFCFD009280BC /* UITabBarController+RNNOptions.m in Sources */,

lib/ios/TabBarItemAppearanceCreator.m

@@ -2,21 +2,21 @@
 
 @implementation TabBarItemAppearanceCreator
 
-+ (UITabBarItem *)createTabBarItem:(UITabBarItem *)mergeItem {
+- (UITabBarItem *)createTabBarItem:(UITabBarItem *)mergeItem {
     UITabBarItem *tabBarItem = [super createTabBarItem:mergeItem];
     tabBarItem.standardAppearance =
         mergeItem.standardAppearance ?: [[UITabBarAppearance alloc] init];
     return tabBarItem;
 }
 
-+ (void)setTitleAttributes:(UITabBarItem *)tabItem titleAttributes:(NSDictionary *)titleAttributes {
+- (void)setTitleAttributes:(UITabBarItem *)tabItem titleAttributes:(NSDictionary *)titleAttributes {
     tabItem.standardAppearance.stackedLayoutAppearance.normal.titleTextAttributes = titleAttributes;
     tabItem.standardAppearance.compactInlineLayoutAppearance.normal.titleTextAttributes =
         titleAttributes;
     tabItem.standardAppearance.inlineLayoutAppearance.normal.titleTextAttributes = titleAttributes;
 }
 
-+ (void)setSelectedTitleAttributes:(UITabBarItem *)tabItem
+- (void)setSelectedTitleAttributes:(UITabBarItem *)tabItem
            selectedTitleAttributes:(NSDictionary *)selectedTitleAttributes {
     tabItem.standardAppearance.stackedLayoutAppearance.selected.titleTextAttributes =
         selectedTitleAttributes;

lib/ios/TabBarItemIOS15Creator.h

@@ -0,0 +1,6 @@
+#import "TabBarItemAppearanceCreator.h"
+
+API_AVAILABLE(ios(15.0))
+@interface TabBarItemIOS15Creator : TabBarItemAppearanceCreator
+
+@end