扫码无权限优化，司机预约多弹窗

ln_jq_app/lib/pages/qr_code/controller.dart

@@ -24,6 +24,8 @@ class QrCodeController extends GetxController
   final RxBool isFlashOn = false.obs;
   final RxBool isProcessingResult = false.obs;
 
+  final RxBool hasPermission = false.obs;
+
   @override
   void onInit() {
     super.onInit();
@@ -47,7 +49,6 @@ class QrCodeController extends GetxController
       isProcessingResult.value = true;
       scannerController.stop();
       animationController.stop();
-      print("相机识别到的内容: ${barcode.rawValue!}");
       renderResult(barcode.rawValue!);
     }
   }
@@ -57,10 +58,10 @@ class QrCodeController extends GetxController
     isProcessingResult.value = false;
     try {
       scannerController.start();
+      animationController.repeat(reverse: false);
     } catch (e) {
       print("无法重启相机: $e");
     }
-    animationController.repeat(reverse: false);
   }
 
   /// 从相册选择图片并扫描二维码
@@ -120,10 +121,19 @@ class QrCodeController extends GetxController
   /// 请求相机权限
   void requestPermission() async {
     var status = await Permission.camera.request();
+
+    hasPermission.value = status.isGranted;
+
     if (!status.isGranted) {
-      showErrorToast('请授予相机权限以使用扫描功能');
-      Get.back();
+      if (status.isPermanentlyDenied) {
+        showErrorToast('相机权限已被永久拒绝，请到系统设置中开启');
+        // 延迟一会再引导用户去设置
+        Future.delayed(const Duration(seconds: 2), () => openAppSettings());
+      } else {
+        showErrorToast('请授予相机权限以使用扫描功能');
+      }
     }
+
   }
 
   void requestPhotoPermission() async {