In order to get it working needs to create also HTML element with specific id. That wasn't mentioned in docs and I was getting error till I made it randomly trying different things.

I only just noticed that I linked directly to the pen instead of the full view:

https://codepen.io/neocotic/full/YQzmBm

I'm using the same example code here: https://ionicframework.com/docs/native/qr-scanner
but the camera not open and throw an error the front camera is unavailable, why?

Hello

                                    $qrCode = (new QrCode('http://example.com'));
                                    $qrCode->useLogo(__DIR__.'/../..https://waybackassets.bk21.net/img/favicon.png')
                                        ->setSize(250)
                                        ->setMargin(5)
                                        ->useEncoding('UTF-8')
                              

The example is nice, however it would be better to have docs.

It could be in the wiki section or next to the code.

在使用这个库的时候，发现有一个问题，当屏幕范围内有多个二维码的时候，会导致解析不出来二维码的结果。

然后我就和 @shifeng1993 进行邮件交流 😃 ,最终定位出了问题，也得到一个暂时可行的解决方案。

二维码示例

原因分析

如果屏幕范围内只有一个二维码，那么这个库能完美解决问题。但是，存在多个二维码的时候，就有问题了。

react-native-camera识别二维码的顺序是先识别第一个二维码，在识别第二个二维码，再限制了区域，所以你对准第二个二维码在框内的时候，实际react-native-camera得到是第一个二维