Remove dependency on dart:io

Signed-off-by: Shengqi Chen <harry-chen@outlook.com>

Author: Harry-Chen

CHANGELOG.md

@@ -182,6 +182,7 @@
 This is a release candidate for 3.6.0. Please test it and report any issues.
 
 * Remove annoying dependency on `js` library, replace with `dart:js_interop`
+* Remove dependency on `dart:io`
 * Contributions on Android plugin from @knthm:
   * Dedicated handler thread for IO operations (#167)
   * More elegant exception handling (#169)

android/src/main/kotlin/im/nfc/flutter_nfc_kit/FlutterNfcKitPlugin.kt

@@ -380,6 +380,8 @@ class FlutterNfcKitPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
                 }
             }
 
+            // do nothing, just for compatibility
+            "setIosAlertMessage" -> { result.success("") }
         }
     }
 

lib/flutter_nfc_kit.dart

@@ -1,6 +1,5 @@
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io' show Platform;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
@@ -433,7 +432,7 @@ class FlutterNfcKit {
   /// There must be a valid session when invoking.
   /// On Android, call to this function does nothing.
   static Future<void> setIosAlertMessage(String message) async {
-    if (!kIsWeb && Platform.isIOS) {
+    if (!kIsWeb) {
       return await _channel.invokeMethod('setIosAlertMessage', message);
     }
   }