兼容 IOS 端

lib/core/permission/permission_service.dart

@@ -17,6 +17,24 @@ class PermissionService {
     return permissions.toList().request();
   }
 
+  /// 仅对尚未授予的权限发起系统授权弹窗，已授予则直接返回当前状态。
+  static Future<Map<Permission, PermissionStatus>> requestMissing(
+    Iterable<Permission> permissions,
+  ) async {
+    final result = <Permission, PermissionStatus>{};
+    for (final permission in permissions) {
+      final current = await permission.status;
+      if (current.isGranted ||
+          current.isLimited ||
+          current.isPermanentlyDenied) {
+        result[permission] = current;
+        continue;
+      }
+      result[permission] = await permission.request();
+    }
+    return result;
+  }
+
   static Future<bool> ensure(
     Permission permission, {
     bool openSettingsWhenPermanentlyDenied = true,