iOS二维码识别/二维码生成

最近在做一个关于二维码的组件，已发布，现总结下。开发的APP所需支持的最低版本为7.0，最初的方案为扫描使用苹果自带的API实现扫一扫的功能、使用ZXing识别从相册或别人转发的二维码图片。但发现ZXing识别从相册中来的图片性能很差，很多图片识别不了，且耗时较长，遂使用ZBar来实现识别从相册或别人转发的二维码图片。

扫描：

    AVCaptureDevice* inputDevice =    [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    [inputDevice lockForConfiguration:nil];    if ([inputDevice hasTorch])    {        inputDevice.torchMode = AVCaptureTorchModeAuto;    }    [inputDevice unlockForConfiguration];    AVCaptureDeviceInput *captureInput =    [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:nil];    if (!captureInput) {        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)        {            UIAlertController *alterVC = [UIAlertController alertControllerWithTitle:@"系统提示" message:@"您已关闭相机使用权限，请至手机“设置->隐私->相机”中打开" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];            [alterVC addAction:confirmAction];            [self presentViewController:alterVC animated:YES completion:nil];        }        else        {            UIAlertController *alterVC = [UIAlertController alertControllerWithTitle:@"系统提示" message:@"未能找到相机设备" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];            [alterVC addAction:confirmAction];            [self presentViewController:alterVC animated:YES completion:nil];        }        return;    }    AVCaptureMetadataOutput *captureOutput = [[AVCaptureMetadataOutput alloc] init];    [captureOutput setMetadataObjectsDelegate:self queue:_queue];    self.captureOutput = captureOutput;    self.captureSession = [[AVCaptureSession alloc] init];    [self.captureSession addInput:captureInput];    [self.captureSession addOutput:captureOutput];    CGFloat w = 1920.f;    CGFloat h = 1080.f;    if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset1920x1080]) {        self.captureSession.sessionPreset = AVCaptureSessionPreset1920x1080;    } else
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