QRCodeImage *qrCodeImage = [QRCodeImage codeImageWithString:@"https://github.com/STShenZhaoliang/QRCode"
                                                       size:200
                                                      color:[UIColor orangeColor]
                                                       icon:[UIImage imageNamed:@"icon.jpg"]
                                                  iconWidth:50];
UIImageView *qrImageView = [[UIImageView alloc]initWithImage:qrCodeImage];
qrImageView.center = self.view.center;
[self.view addSubview:qrImageView];