attempt fixing ios background color

lib/fluttertoast.dart

 import 'dart:async';
+import 'dart:ui';
 
 import 'package:flutter/services.dart';
 import 'package:meta/meta.dart';
 
+enum Toast { LENGTH_SHORT, LENGTH_LONG }
 
-enum Toast {
-  LENGTH_SHORT,
-  LENGTH_LONG
-}
-
-enum ToastGravity {
-  TOP,
-  BOTTOM,
-  CENTER
-}
-
+enum ToastGravity { TOP, BOTTOM, CENTER }
 
 class Fluttertoast {
-
   static const MethodChannel _channel =
-  const MethodChannel('PonnamKarthik/fluttertoast');
-
-  static Future<String> showToast ({
-    @required String msg,
-    Toast toastLength,
-    int timeInSecForIos = 1,
-    ToastGravity gravity,
-    String bgcolor = "null",
-    String textcolor = "null"
-  }) async {
+      const MethodChannel('PonnamKarthik/fluttertoast');
+
+  static Future<String> showToast(
+      {@required String msg,
+      Toast toastLength,
+      int timeInSecForIos = 1,
+      ToastGravity gravity,
+      Color backgroundColor,
+      Color textColor}) async {
     String toast = "short";
-    if(toastLength == Toast.LENGTH_LONG) {
+    if (toastLength == Toast.LENGTH_LONG) {
       toast = "long";
     }
 
     String gravityToast = "bottom";
-    if(gravity == ToastGravity.TOP) {
+    if (gravity == ToastGravity.TOP) {
       gravityToast = "top";
-    } else if(gravity == ToastGravity.CENTER) {
+    } else if (gravity == ToastGravity.CENTER) {
       gravityToast = "center";
     } else {
       gravityToast = "bottom";
     }
 
-    final Map<String, dynamic> params = <String, dynamic> {
+    final Map<String, dynamic> params = <String, dynamic>{
       'msg': msg,
       'length': toast,
       'time': timeInSecForIos,
       'gravity': gravityToast,
-      'bgcolor': bgcolor,
-      'textcolor': textcolor
+      'bgcolor': backgroundColor.value.toString() ?? "null",
+      'textcolor': textColor.value.toString() ?? "null"
     };
     String res = await _channel.invokeMethod('showToast', params);
     return res;
   }
-
-}
\ No newline at end of file
+}