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Are there any free scanning libraries with PDF417 capability available to integrate with iOS apps?

PDF417 barcode

If it supports Android, then that would be even great.

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Try RMScannerView:

Simple barcode scanner UIView subclass for iOS apps. Quickly and efficiently scans a large variety of barcodes using the iOS device's built in camera.

It is the only free project I've found that supports also PDF417 barcodes:

Scan Aztec, Code 128, Code 39, Code 39 Mod 43, Code 93, EAN13, EAN8, PDF417, QR, and UPCE codes.

I tried it and it works fine.

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The current AVFoundation support PDF417 metadata. Too late to answer but if this is still required, AVFoundation solves the issue. Just add the following code to the scanning session:

let metadataOutput = AVCaptureMetadataOutput()

 metadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
 metadataOutput.metadataObjectTypes = [.pdf417]

Hope this helps someone.

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