Moved scroll fix changes in the iOS platform for bottom sheet

Author: naveenkumar-sanjeevirayan

maui/src/BottomSheet/BottomSheetBorder.cs

@@ -13,16 +13,23 @@ internal class BottomSheetBorder : SfBorder, ITouchListener
 		// To store the weak reference of bottom sheet instance.
         readonly WeakReference<SfBottomSheet>? _bottomSheetRef;
 
-		#endregion
+#if IOS
+
+		// To store the child count of bottom sheet
+		double _childLoopCount;
+
+#endif
+
+#endregion
 
 		#region Constructor
 
 		/// <summary>
-        /// Initializes a new instance of the <see cref="BottomSheetBorder"/> class.
-        /// </summary>
-        /// <param name="bottomSheet">The SfBottomSheet instance.</param>
-        /// <exception cref="ArgumentNullException">Thrown if bottomSheet is null.</exception>
-        public BottomSheetBorder(SfBottomSheet bottomSheet)
+		/// Initializes a new instance of the <see cref="BottomSheetBorder"/> class.
+		/// </summary>
+		/// <param name="bottomSheet">The SfBottomSheet instance.</param>
+		/// <exception cref="ArgumentNullException">Thrown if bottomSheet is null.</exception>
+		public BottomSheetBorder(SfBottomSheet bottomSheet)
         {
 			if (bottomSheet is not null)
 			{
@@ -33,6 +40,72 @@ public BottomSheetBorder(SfBottomSheet bottomSheet)
 
 		#endregion
 
+		#region Private Methods
+
+#if IOS
+		/// <summary>
+		/// Gets the X and Y coordinates of the specified element based on the screen.
+		/// </summary>
+		/// <param name="element">The current element for which coordinates are requested.</param>
+		/// <param name="touchPoint">The current element for which coordinates are requested.</param>
+		bool IsChildElementScrolled(IVisualTreeElement? element, Point touchPoint)
+		{
+			if (element is null)
+			{
+				return false;
+			}
+
+			var view = element as View;
+			if (view is null || view.Handler is null || view.Handler.PlatformView is null)
+			{
+				return false;
+			}
+
+			if (view is ScrollView || view is ListView || view is CollectionView)
+			{
+				return true;
+			}
+
+			foreach (var childView in element.GetVisualChildren().OfType<View>())
+			{
+				if (childView is null || childView.Handler is null || childView.Handler.PlatformView is null)
+				{
+					return false;
+				}
+
+				var childNativeView = childView.Handler.PlatformView;
+
+				// Here items X and Y position converts based on screen.
+				Point locationOnScreen = ChildLocationToScreen(childNativeView);
+				var bottom = locationOnScreen.Y + childView.Bounds.Height;
+				var right = locationOnScreen.X + childView.Bounds.Width;
+
+				// We loop through child only 10 times.
+				if (touchPoint.Y >= locationOnScreen.Y && touchPoint.Y <= bottom && touchPoint.X >= locationOnScreen.X && touchPoint.X <= right && _childLoopCount <= 10)
+				{
+					_childLoopCount++;
+					return IsChildElementScrolled(childView, touchPoint);
+				}
+			}
+
+			_childLoopCount = 0;
+			return false;
+		}
+
+		Point ChildLocationToScreen(object child)
+		{
+			if (child is UIKit.UIView view && this.Handler is not null)
+			{
+				var point = view.ConvertPointToView(view.Bounds.Location, Handler.PlatformView as UIKit.UIView);
+				return new Microsoft.Maui.Graphics.Point(point.X, point.Y);
+			}
+
+			return new Microsoft.Maui.Graphics.Point(0, 0);
+		}
+#endif
+
+		#endregion
+
 		#region Interface Implementation
 
 		/// <summary>
@@ -42,15 +115,32 @@ public BottomSheetBorder(SfBottomSheet bottomSheet)
 		public void OnTouch(Toolkit.Internals.PointerEventArgs e)
 		{
 #if IOS || MACCATALYST || ANDROID
+
+#if IOS
+			if (Content is null)
+			{
+				return;
+			}
+
+			var firstDescendant = Content.GetVisualTreeDescendants().FirstOrDefault();
+			if (firstDescendant is not null && IsChildElementScrolled(firstDescendant, e.TouchPoint))
+			{
+				return;
+			}
+
+#endif
 			if (e is not null && _bottomSheetRef is not null)
 			{
 				if (_bottomSheetRef.TryGetTarget(out var bottomSheet))
 				{
 					bottomSheet.OnHandleTouch(e.Action, e.TouchPoint);
 				}
 			}
+
 #endif
 		}
+
 		#endregion
+
 	}
 }