更新ios蓝牙开关判定

lib/common/util/BluetoothHelper.dart

@@ -0,0 +1,39 @@
+import 'dart:async';
+import 'package:flutter_blue_plus/flutter_blue_plus.dart';
+
+class BluetoothHelper {
+  static StreamSubscription<BluetoothAdapterState>? _subscription;
+
+  /// 获取当前蓝牙是否开启（跨平台封装）
+  static Future<bool> isBluetoothOn({Duration timeout = const Duration(seconds: 2)}) async {
+    // 先尝试直接获取（Android 上几乎即时可用）
+    bool directCheck = await FlutterBluePlus.isOn;
+    if (directCheck) return true;
+
+    // iOS 上有初始化延迟，用 adapterState.first 再确认一次
+    try {
+      BluetoothAdapterState state = await FlutterBluePlus.adapterState
+          .firstWhere((s) => s != BluetoothAdapterState.unknown,
+              orElse: () => BluetoothAdapterState.unknown)
+          .timeout(timeout);
+
+      return state == BluetoothAdapterState.on;
+    } catch (_) {
+      return false;
+    }
+  }
+
+  /// 监听蓝牙状态变化
+  static void listenBluetoothState(void Function(bool isOn) onChange) {
+    _subscription?.cancel();
+    _subscription = FlutterBluePlus.adapterState.listen((state) {
+      onChange(state == BluetoothAdapterState.on);
+    });
+  }
+
+  /// 停止监听
+  static void cancelListener() {
+    _subscription?.cancel();
+    _subscription = null;
+  }
+}