Fix iOS crash from Dynamsoft setCameraView nullable NSNumber signature

[stealkiller06]

Details

The app crashes/logs a React Native bridge argument error on iOS when initializing the VIN barcode scanner with Dynamsoft:

Argument 0 (NSNumber) of DynamsoftCameraView.setCameraView is marked as nullable but React requires that all NSNumber arguments are explicitly marked as `nonnull` to ensure compatibility with Android.

This happens because dynamsoft-capture-vision-react-native@3.4.1100 exports the iOS native method as:

RCT_EXPORT_METHOD(setCameraView:(nullable NSNumber *)tag)

React Native 0.79.7 validates native module method signatures in debug mode and rejects nullable NSNumber arguments. RN requires NSNumber arguments to be explicitly marked as nonnull for Android compatibility.

The JS wrapper already avoids passing native null into this method. When CameraEnhancer.setCameraView(null) is called from JS, Dynamsoft translates it to:

DynamsoftCameraEnhancerModule.setCameraView(0);

So the native method contract is already effectively non-null, using 0 as the sentinel value to clear/unbind the camera view.

Proposed Fix

Patch dynamsoft-capture-vision-react-native so the iOS native export changes from:

RCT_EXPORT_METHOD(setCameraView:(nullable NSNumber *)tag)

to:

RCT_EXPORT_METHOD(setCameraView:(nonnull NSNumber *)tag)

No app-level JS changes are required.

[Pirlo-Dynamsoft]

Thanks for the detailed analysis!
I've verified this directly in the React Native source code (RCTModuleMethod.mm) and confirmed that under #if RCT_DEBUG, there is indeed a strict check for NSNumber arguments. It explicitly requires them to be marked as nonnull to ensure compatibility with Android.
Even though my JS implementation already handles the null case by passing 0 , the native method signature still needs to be updated to satisfy this bridge validation.
I will fix this by changing the signature to (nonnull NSNumber *)tag in the next release. Thanks again for your contribution!

[Dynamsoft-Henry]

Hi @stealkiller06
We released dynamsoft-capture-vision-react-native v3.4.1200. This issue is fixed in the new version.