feat: ice断开返回配置页面

webrtc_controller_flutter/lib/main.dart

@@ -43,6 +43,9 @@ class _ControllerHomeState extends State<ControllerHome> {
   RemoteController? _controller;
   RTCVideoRenderer? _renderer;
 
+  /// 用于在任意位置（含回调中）弹出提示。
+  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
+
   bool _connected = false;
   String _status = '状态: 已停止';
   String _stats = '';
@@ -93,6 +96,9 @@ class _ControllerHomeState extends State<ControllerHome> {
       setState(() => _connected = false);
       _setStatus('状态: 远端已断开');
     };
+    _controller!.onIceDisconnected = (message) {
+      _onIceDisconnected(message);
+    };
     _controller!.onRemoteStream = (renderer) {
       setState(() => _renderer = renderer);
       renderer.addListener(_onRendererUpdate);
@@ -110,6 +116,20 @@ class _ControllerHomeState extends State<ControllerHome> {
     }
   }
 
+  /// ICE 断开：提示用户并自动返回连接设置面板。
+  Future<void> _onIceDisconnected(String message) async {
+    final scaffoldCtx = _scaffoldKey.currentState?.context;
+    if (mounted && scaffoldCtx != null) {
+      ScaffoldMessenger.of(scaffoldCtx).showSnackBar(
+        SnackBar(
+          content: Text(message),
+          duration: const Duration(seconds: 3),
+        ),
+      );
+    }
+    await _disconnect();
+  }
+
   Future<void> _disconnect() async {
     await _controller?.disconnect();
     _controller = null;
@@ -125,6 +145,7 @@ class _ControllerHomeState extends State<ControllerHome> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
+      key: _scaffoldKey,
       appBar: AppBar(title: const Text('WebRTC 控制端')),
       body: _connected ? _buildControlPanel() : _buildSetupPanel(),
     );