问题:

I've integrated the zxing library into my app but part of my requirement is to be able to continually scan QR codes. I've accomplished this to a certain degree by dismissing and re-presenting the zxing widget but it appears to be too slow for my client. Is there another way to reset the widget to start scanning again?

回答1:

You will have to tamper with the ZXing library, fortunately it's not hard.

Add the following method to the ZXingWidgetController

In ZXingWidgetController.h

- (void)reset;

In ZXingWidgetController.m

- (void)reset
{
    decoding = YES;
    [overlayView setPoints:nil];
    wasCancelled = NO;
}

Now, in your ZXing delegate, edit the following method

- (void)zxingController:(ZXingWidgetController*)controller didScanResult:(NSString *)result
{
    //Handle your result as you want to

    [controller reset];
}

Make sure you don't call [self dismissModalViewControllerAnimated:NO]; as it will remove the scanning view.

回答2:

Why not try for another great library ZBar - http://zbar.sourceforge.net/
Its quite easy and always work for me! You must have a look into if you are scanning QR codes in your app.