.NET MAUI iOS - System.DllNotFoundException: NcnnDotNetNative

[ITBrainSol]

I've developed a .NET MAUI App and used "UltraFaceDotNet" for face detection.

It works fine in Android but when I try to execute the same code for iOS it return with following exception

{System.DllNotFoundException: NcnnDotNetNative
   at NcnnDotNet.Net..ctor()
   at UltraFaceDotNet.UltraFace..ctor(UltraFaceParameter parameter)
   at UltraFaceDotNet.UltraFace.Create(UltraFaceParameter parameter)
   at CamView.Services.DetectService..ctor() in {MY-PROJECT-PATH}\DetectService.cs:line 76}

Line # 76 is where it's trying to Create UltraFace object from provided parameters as following

var param = new UltraFaceParameter
       {
           BinFilePath = binPath,
           ParamFilePath = paramPath,
           InputWidth = 320,
           InputLength = 240,
           NumThread = 1,
           ScoreThreshold = 0.7f
       };

       this._UltraFace = UltraFace.Create(param);

Following are the libraries and files I've used

It also created link to following Libs

Can you please help to find out the issue?

Many Thanks

[andersonvieiragomeslopes]

Hi @ITBrainSol

I tried it on my iOS and it didn't work, but it also doesn't generate errors. Did you try adding this?

<MtouchExtraArgs>-gcc_flags "-lc++ -framework Metal"</MtouchExtraArgs>

I'll try adding it here and see if it works. It works fine on my Android, but not on iOS.