How to scan Qr code from an image picked with UIIm

问题:

I am able to scan qr code with camera without using any external libraries like ZBAR or ZXING.

Now what I actually want is to let the user upload an image from photo library and get the qr code scanned from that uploaded image.

I know how to use UIImagePickerController (used it before).

What I want to ask is that, How can I scan qr code from an uploaded image (without using the camera)

You can suggest some code (.h / .m files) that I can add in my project.

Please don't suggest me any external libraries like ZBAR or ZXING.

回答1:

I know you might have found solution for this but i am replying to the post if my answer may help other for relevant question.

Here I am posting my code to ScanQRCode from image picked from gallery without using any Library.

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {



    if let pickedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
                 let detector:CIDetector=CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyHigh])

    let ciImage:CIImage = CIImage(image:pickedImage)!

    var qrCodeLink = ""

    let features=detector.featuresInImage(ciImage)

    for feature in features as! [CIQRCodeFeature] {

        qrCodeLink += feature.messageString
    }

    print(qrCodeLink)//Your result from QR Code
}

    dismissViewControllerAnimated(true, completion: nil)
}

回答2:

In Apple's iOS, a QR code reader is not natively included. Therefore there is no API from Apple you can use.

You have to rely either or third party SDKs or write your own code.