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A barcode and qr code scanner (二维码、扫码、扫一扫、ZXing、ZBar、iOS系统AVFoundation扫码封装,扫码界面效果封装)

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iphone XR生成二维码 崩溃 [LBXScanNative createQRWithString:valueStr QRSize: CGSizeMake(200, 200)]; 其他系统 没问题 iPhone6,iPhone ps ,iPhonex 没问题, iPhone XR 生成耳闻吗崩溃 ![image](https://user-images.githubusercontent.com/17614363/72045872-2015de80-32f2-11ea-8fdb-26b2ed5c3c82.png)

仅在iPhoneX的机型上,扫码框有上下两个线条,模拟器和真机都可查看

3cm*3cm的二维码识别不出来,微信可以,有方法提高精度的么?

![QQ20190311-103135](https://user-images.githubusercontent.com/14361443/54096946-031a3180-43e9-11e9-9846-bbe512571e7b.png) 手机截屏的二维码识别崩溃,建议崩溃这里加非 nil 判断

- 在网上百度了很多种方法都不能解决https://blog.csdn.net/lsy2013/article/details/46827435这种方法也没有解决 ![image](https://user-images.githubusercontent.com/53483578/62138657-90b7d880-b31a-11e9-9215-e9a549803f94.jpg)

自定义相机实现 圆形拍摄 头像或者印章的功能,请问能否实现呢?

增加对C++兼容的宏: #ifndef __cplusplus #endif 如果不增加这个,当项目同时引入LBXScan与一个C++库时,@import无法编译过,要么换成#import,要么增加如上的宏

`- (AVCaptureVideoDataOutput *)output { if (!_output) { _output = [[AVCaptureVideoDataOutput alloc] init]; [_output setVideoSettings:@{ (NSString *)kCVPixelBufferPixelFormatTypeKey : [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA] }]; [_output setAlwaysDiscardsLateVideoFrames:YES]; [_output setSampleBufferDelegate:self queue:_captureQueue]; [self.session addOutput:_output]; } return _output;...

enhancement