Ios 如何在使用ZBar SDK扫描二维码时删除绿色矩形？

单击按钮读取器时，QR显示为绿色矩形。

查看，将

轨迹符号设置为
否可能会起作用

- (IBAction)scanProduct:(id)sender
{   
   // for scanning product
    ZBarReaderViewController *reader = [[ZBarReaderViewController alloc] init];
    reader.readerDelegate = self;
    reader.supportedOrientationsMask = ZBarOrientationMaskAll;    
    ZBarImageScanner *scanner = reader.scanner;    
    [scanner setSymbology: ZBAR_I25
                               config: ZBAR_CFG_ENABLE
                                   to: 0];    
    [self presentModalViewController: readerqr
                                        animated: YES];  
}