fix(ios): prevent SwiftUI filter content collapse

Author: lujjjh

packages/react-native/ReactApple/RCTSwiftUI/RCTSwiftUIContainerView.swift

@@ -15,9 +15,10 @@ import UIKit
   @objc public override init() {
     super.init()
     hostingController = UIHostingController(rootView: SwiftUIContainerView(viewModel: containerViewModel))
-    guard let view = hostingController?.view else {
+    guard let hostingController, let view = hostingController.view else {
       return
     }
+    Self.disableSafeArea(for: hostingController)
     view.backgroundColor = .clear
   }
 
@@ -77,6 +78,48 @@ import UIKit
     containerViewModel.contrastAmount = 1
     containerViewModel.hueRotationDegrees = 0
   }
+
+  private static func disableSafeArea(
+    for hostingController: UIHostingController<SwiftUIContainerView>
+  ) {
+    if #available(iOS 16.4, *) {
+      hostingController.safeAreaRegions = []
+      return
+    }
+
+    // Keep the pre-16.4 fallback scoped to this hosting view instance instead
+    // of changing SwiftUI's private hosting view class globally.
+    guard let hostingView = hostingController.view,
+      let viewClass = object_getClass(hostingView)
+    else {
+      return
+    }
+
+    let subclassName = String(cString: class_getName(viewClass))
+      .appending("_RCTIgnoresSafeArea")
+    if let viewSubclass = NSClassFromString(subclassName) {
+      object_setClass(hostingView, viewSubclass)
+      return
+    }
+
+    guard let subclassNameUtf8 = (subclassName as NSString).utf8String,
+      let viewSubclass = objc_allocateClassPair(viewClass, subclassNameUtf8, 0),
+      let method = class_getInstanceMethod(UIView.self, #selector(getter: UIView.safeAreaInsets))
+    else {
+      return
+    }
+
+    let safeAreaInsets: @convention(block) (AnyObject) -> UIEdgeInsets = { _ in
+      return .zero
+    }
+    class_addMethod(
+      viewSubclass,
+      #selector(getter: UIView.safeAreaInsets),
+      imp_implementationWithBlock(safeAreaInsets),
+      method_getTypeEncoding(method))
+    objc_registerClassPair(viewSubclass)
+    object_setClass(hostingView, viewSubclass)
+  }
 }
 
 class ContainerViewModel: ObservableObject {