refactor to a BottomAccessoryProvider

Author: johankasperi

packages/react-native-bottom-tabs/ios/BottomAccessoryProvider.swift

@@ -0,0 +1,25 @@
+import SwiftUI
+
+@objc public class BottomAccessoryProvider: PlatformView {
+  private weak var delegate: BottomAccessoryProviderDelegate?
+  
+  @objc public convenience init(delegate: BottomAccessoryProviderDelegate) {
+    self.init()
+    self.delegate = delegate
+  }
+  
+  @available(iOS 26.0, *)
+  public func emitPlacementChanged(_ placement: TabViewBottomAccessoryPlacement?) {
+    var placementValue = "none"
+    if placement == .inline {
+      placementValue = "inline"
+    } else if placement == .expanded {
+      placementValue = "expanded"
+    }
+    self.delegate?.onPlacementChanged(placement: placementValue)
+  }
+}
+
+@objc public protocol BottomAccessoryProviderDelegate {
+  func onPlacementChanged(placement: String)
+}

packages/react-native-bottom-tabs/ios/RCTBottomAccessoryComponentView.h

@@ -10,8 +10,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface RCTBottomAccessoryComponentView: RCTViewComponentView
 
-- (void)emitOnPlacementChanged:(NSString *)placement;
-
 @end
 
 NS_ASSUME_NONNULL_END

packages/react-native-bottom-tabs/ios/RCTBottomAccessoryComponentView.mm

@@ -16,6 +16,10 @@
 
 using namespace facebook::react;
 
+@interface RCTBottomAccessoryComponentView () <BottomAccessoryProviderDelegate> {
+}
+@end
+
 @implementation RCTBottomAccessoryComponentView
 
 + (ComponentDescriptorProvider)componentDescriptorProvider
@@ -27,6 +31,9 @@ - (instancetype)initWithFrame:(CGRect)frame
 {
   if (self = [super initWithFrame:frame]) {
     static const auto defaultProps = std::make_shared<const BottomAccessoryViewProps>();
+    if (@available(iOS 26.0, *)) {
+      self.contentView = [[BottomAccessoryProvider alloc] initWithDelegate:self];
+    }
   }
 
   return self;
@@ -49,7 +56,10 @@ - (void)updateProps:(Props::Shared const &)props oldProps:(Props::Shared const &
   [super updateProps:props oldProps:oldProps];
 }
 
-- (void)emitOnPlacementChanged:(NSString *)placement {
+//  MARK: BottomAccessoryProviderDelegate
+
+- (void)onPlacementChangedWithPlacement:(NSString *)placement
+{
   auto eventEmitter = std::static_pointer_cast<const BottomAccessoryViewEventEmitter>(_eventEmitter);
   if (eventEmitter) {
     eventEmitter->onPlacementChanged(BottomAccessoryViewEventEmitter::OnPlacementChanged {

packages/react-native-bottom-tabs/ios/TabView/NewTabView.swift

@@ -119,16 +119,8 @@ struct BottomAccessoryRepresentableView: PlatformViewRepresentable {
   }
 
   private func emitPlacementChanged(for uiView: PlatformView) {
-    let selectorString = "emitOnPlacementChanged:"
-    let selector = NSSelectorFromString(selectorString)
-    if uiView.responds(to: selector) {
-      var placementValue = "none"
-      if tabViewBottomAccessoryPlacement == .inline {
-        placementValue = "inline"
-      } else if (tabViewBottomAccessoryPlacement == .expanded) {
-        placementValue = "expanded"
-      }
-      uiView.perform(selector, with: placementValue)
+    if let contentView = uiView.value(forKey: "contentView") as? BottomAccessoryProvider {
+      contentView.emitPlacementChanged(tabViewBottomAccessoryPlacement)
     }
   }
 }