sửa sửa lỗi polygon không bị xóa trên iOS

app/(tabs)/index.tsx

@@ -55,11 +55,11 @@ export default function HomeScreen() {
   const [zoomLevel, setZoomLevel] = useState(10);
   const [isFirstLoad, setIsFirstLoad] = useState(true);
   const [polylineCoordinates, setPolylineCoordinates] = useState<
-    PolylineWithLabelProps | undefined
-  >(undefined);
+    PolylineWithLabelProps | null
+  >(null);
   const [polygonCoordinates, setPolygonCoordinates] = useState<
-    PolygonWithLabelProps[] | undefined
-  >(undefined);
+    PolygonWithLabelProps[]
+  >([]);
   const platform = usePlatform();
   const theme = useColorScheme();
   const scale = useRef(new Animated.Value(0)).current;
@@ -82,6 +82,8 @@ export default function HomeScreen() {
         setGpsData(gpsData);
       } else {
         setGpsData(undefined);
+        setPolygonCoordinates([]);
+        setPolylineCoordinates(null);
       }
     };
     const queryAlarmData = (alarmData: Model.AlarmResponse) => {
@@ -133,7 +135,7 @@ export default function HomeScreen() {
   }, []);
 
   useEffect(() => {
-    if (polylineCoordinates !== undefined) {
+    if (polylineCoordinates !== null) {
       console.log("Polyline Khac null");
     } else {
       console.log("Polyline null");
@@ -141,8 +143,16 @@ export default function HomeScreen() {
   }, [polylineCoordinates]);
 
   useEffect(() => {
-    setPolylineCoordinates(undefined);
-    setPolygonCoordinates(undefined);
+    if (polygonCoordinates.length > 0) {
+      console.log("Polygon Khac null");
+    } else {
+      console.log("Polygon null");
+    }
+  }, [polygonCoordinates]);
+
+  useEffect(() => {
+    setPolylineCoordinates(null);
+    setPolygonCoordinates([]);
     if (!entityData) return;
     if (!banzoneData) return;
     for (const entity of entityData) {
@@ -159,8 +169,8 @@ export default function HomeScreen() {
       }
       // Nếu danh sách zone rỗng, clear tất cả
       if (zones.length === 0) {
-        setPolylineCoordinates(undefined);
-        setPolygonCoordinates(undefined);
+        setPolylineCoordinates(null);
+        setPolygonCoordinates([]);
         return;
       }
 
@@ -335,7 +345,7 @@ export default function HomeScreen() {
               />
             );
           })}
-        {polylineCoordinates !== undefined && (
+        {polylineCoordinates && (
           <PolylineWithLabel
             coordinates={polylineCoordinates.coordinates}
             label={polylineCoordinates.label}
@@ -346,7 +356,7 @@ export default function HomeScreen() {
             zIndex={50}
           />
         )}
-        {polygonCoordinates !== undefined && (
+        {polygonCoordinates.length > 0 && (
           <>
             {polygonCoordinates.map((polygon, index) => {
               // Tạo key ổn định từ tọa độ đầu tiên của polygon