diff --git a/NFCLockDemoV2/MainPage.xaml.cs b/NFCLockDemoV2/MainPage.xaml.cs
index 2f627ac..fccfc15 100644
--- a/NFCLockDemoV2/MainPage.xaml.cs
+++ b/NFCLockDemoV2/MainPage.xaml.cs
@@ -14,7 +14,11 @@ public partial class MainPage : ContentPage
 #if IOS
     private void SetNFCCallbacks()
     {
-        NFCManager.SetLoopCbWithCb();
+        NFCManager.SetLoopCbWithCb((NSString id, bool isNew,int rssi) => {
+            _mainMainViewModel.DeviceId = id;
+            _mainMainViewModel.DeviceRssi = rssi.ToString();
+            return true;
+        });
         NFCManager.SetFinishedCbWithCb(() =>
         {
             System.Diagnostics.Debug.WriteLine("finished");
diff --git a/NfcLock.Ios.Binding/ApiDefinition.cs b/NfcLock.Ios.Binding/ApiDefinition.cs
index 83046e3..b756362 100644
--- a/NfcLock.Ios.Binding/ApiDefinition.cs
+++ b/NfcLock.Ios.Binding/ApiDefinition.cs
@@ -26,7 +26,7 @@ namespace NfcLock.Ios.Binding
         // +(void)setLoopCbWithCb:(id)cb;
         [Static]
         [Export ("setLoopCbWithCb:")]
-        void SetLoopCbWithCb (Func<NSString, bool, nint, bool> callback);
+        void SetLoopCbWithCb (Func<NSString, bool, int, bool> cb);
 
         // +(void)setFinishedCbWithCb:(void (^ _Nonnull)(void))cb;
         [Static]