How do I use the metadataOutputRectOfInterestForRect method and rectOfInterest property to scan a specific area? (QR Code)

Question

I am building a QR code scanner with Swift and everything works in that regard. The issue I have is that I am trying to make only a small area of the entire visible A

Answer 1

Swift 4:

captureSession?.startRunning()
let scanRect = CGRect(x: 0, y: 0, width: 100, height: 100)
let rectOfInterest = layer.metadataOutputRectConverted(fromLayerRect: scanRect)
metaDataOutput.rectOfInterest = rectOfInterest