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I was switching the Detector scanner from QR to Rectangle type of detection but on Rectangle type of detection I cannot take the feature.messageString out of CIRectangleFeature, while on CIQRCodeFeature it works. Only what I had changed was ofType: CIDetectorTypeQRCode into CIDetectorTypeRectangle and features as? [CIQRCodeFeature] into features as? [CIRectangleFeature] here is the code func processQRCodeImage(_ image: UIImage) { var qrCodeLink = "" let detector: CIDetector = CIDetector(ofType: CIDetectorTypeRectangle, context: nil, options: [CIDetectorAccuracy: CIDetectorAccuracyHigh])! let ciImage: CIImage = CIImage(image: image)! let features = detector.features(in: ciImage) if let features = features as? [CIRectangleFeature] { for feature in features { qrCodeLink += feature.messageString! // Value of type 'CIRectangleFeature' has no member 'messageString' COMPILE ERROR } } if qrCodeLink.isEmpty { failedQRCoderead() } else { found(code: qrCodeLink) onBackPressed?() } }