可能是您在使用效果时没有正确调用requestCameraPermission，错过了add（）！？

requestCameraPermission();

另外，您不需要使用“else”，因为“if”已经有了return语句。

const ScanProduct = ({ navigation }) => {
  // Camera
  const devices = useCameraDevices("wide-angle-camera");
  const device = devices.back;

  React.useEffect(() => {
    requestCameraPermission();
  }, []);

  // Handler
  const requestCameraPermission = React.useCallback(async () => {
    const permission = await Camera.requestCameraPermission();

    if (permission === "denied") await Linking.openSettings();
  }, []);

  function renderCamera() {
    if (device == null) {
      return <View style={{ flex: 1 }} />;
    }

    return (
      <View style={{ flex: 1 }}>
        <Camera
          style={{ flex: 1 }}
          device={device}
          isActive={true}
          enableZoomGesture
        />
      </View>
    );
  }

  return (
    <View>
      {/*Camera*/}
      {renderCamera()}
    </View>
  );
};

否则我宁愿

const style = { flex: 1 }

const ScanProduct = ({ navigation }) => {
 // Permissions and useEffect...

  function RederCamera() {
    if (!device) return </>;

    return (          
      <Camera
        style={style}
        device={device}
        isActive={true}
        enableZoomGesture
      />          
    );
  }

  return (
    <View style={style}>
      <RederCamera />
    </View>
  );
};

</>

if (!device) return

或者只是

return (
    <View>
      {devive ? (
        <Camera style={style} device={device} isActive={true} enableZoomGesture />
      ) : null}
    </View>
  );

此错误似乎是一个构建问题。安装npm包并在app.json中添加插件后

{
  "name": "my app",
  "plugins": [
    [
      "react-native-vision-camera",
      {
        "cameraPermissionText": "$(PRODUCT_NAME) needs access to your Camera.",

        // optionally, if you want to record audio:
        "enableMicrophonePermission": true,
        "microphonePermissionText": "$(PRODUCT_NAME) needs access to your Microphone."
      }
    ]
  ]
}

然后，您需要通过键入重新构建应用程序。* 不要忘记根据需要更改平台和配置文件属性。*

eas build --platform ios --profile development