Automatically scan in iOS3.x

[insprie]

I have it working in iOS4.x to automatically scan but on iOS3.x it does nothing, I'm using the following code

//present a barcode reader that scans from the camera feed
    readerActive = YES;
    ZBarReaderViewController *reader = [ZBarReaderViewController new];
    reader.readerDelegate = self;

    UIImageView *overlayGraphicView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"corners.png"]];
    overlayGraphicView.frame = CGRectMake(30, 60, 260, 310);
    reader.cameraOverlayView = overlayGraphicView;
    [overlayGraphicView release];
    reader.showsZBarControls = NO;

    ZBarImageScanner *scanner = reader.scanner;
    //disable rarely used I2/5 to improve performance
    [scanner setSymbology: ZBAR_I25
                   config: ZBAR_CFG_ENABLE
                       to: 0];

    if (![reader.view superview])
        [scannerView addSubview:reader.view];

I don't want to add a manual scan button and apparrently by default it automatically scans but under iOS3.x it does not. NB it has been weak linked.

Any ideas?

[insprie]

This should be in the developer's section.

[spadix]

> I don't want to add a manual scan button … under iOS3.x

You need to read the chapter in the SDK docs about Backward Compatibility; I believe that everything you ask here is answered there…