微链接:成功读取图像

Question

我要求Microlink读卡器查看卡片的照片，而不是使用相机。我试过万事达卡的人像版和风景版。这就是我如何声明我的主要变量：

let blinkCardRecognizer = MBCBlinkCardRecognizer()
var recognizerList = [MBCRecognizer]()
lazy var recognizerCollection: MBCRecognizerCollection = {
blinkCardRecognizer.extractCvv = false
blinkCardRecognizer.extractIban = false
blinkCardRecognizer.extractExpiryDate = false
recognizerList.append(blinkCardRecognizer)
return MBCRecognizerCollection(recognizers: recognizerList)
}()
lazy var recognizerRunner: MBCRecognizerRunner = {
MBCRecognizerRunner(recognizerCollection: recognizerCollection)
}()

我已经宣布了这两位代表：

MBCBlinkCardOverlayViewControllerDelegate, MBCScanningRecognizerRunnerDelegate

在我得到UIImage之后，我调用这个函数：

func prepareToReadImage(_ theImage: UIImage?) {
recognizerRunner.scanningRecognizerRunnerDelegate = self

var image: MBCImage? = nil
if let anImage = theImage {
image = MBCImage(uiImage: anImage)
}
image?.cameraFrame = true
image?.orientation = MBCProcessingOrientation.down
let _serialQueue = DispatchQueue(label: "com.microblink.DirectAPI-sample-swift")
_serialQueue.async(execute: {() -> Void in
self.recognizerRunner.processImage(image!)
})
}

这是我的代理回拨。每次，我都会得到.empty:的状态

func recognizerRunner(_ recognizerRunner: MBCRecognizerRunner, didFinishScanningWith state: MBCRecognizerResultState) {
if state == .valid { // values: .empty, .uncertain, .valid, .stageValid
let result = blinkCardRecognizer.result

DispatchQueue.main.async(execute: {() -> Void in
print (result.owner)
print (result.cardNumber)
print (result.cardNumberPrefix)
})
}
}

为什么我没有得到.valid响应？此外，一旦(如果和何时(我这样做了，这看起来像是提取卡片详细信息的正确方式吗？谢谢

Answer 1

这个问题与这里的问题有关吗？

如果是，我还可以提出以下建议：你可以添加一个函数来调用图像选择器(我使用设备相机作为源类型(：

private func openImagePicker() {
let imagePicker = UIImagePickerController()
imagePicker.sourceType = .camera
imagePicker.cameraDevice = .rear
addOverlayLabel(toImagePicker: imagePicker)

// Displays a control that allows the user to choose only photos
imagePicker.mediaTypes = [kUTTypeImage as String]

// Hides the controls for moving & scaling pictures, or for trimming movies.
imagePicker.allowsEditing = false

// Shows default camera control overlay over camera preview.
imagePicker.showsCameraControls = true

// set delegate
imagePicker.delegate = self
present(imagePicker, animated: true) {() -> Void in }
imagePickerController = imagePicker
}

在func recognizerRunner中，当状态无效时，可以放置要调用的函数，如下所示：

extension ViewController: MBCScanningRecognizerRunnerDelegate {
func recognizerRunner(_ recognizerRunner: MBCRecognizerRunner, didFinishScanningWith state: MBCRecognizerResultState) {
DispatchQueue.main.async(execute: {() -> Void in
if state != .valid {
self.openImagePicker()
return
}

print(state.rawValue)
let result = self.blinkCardRecognizer.result
print("Owner: (result.owner)")
print("Card number: (result.cardNumber)")
print("Card number prefix: (result.cardNumberPrefix)")

})
}
}

如果状态无效，这将使您有机会重新拍摄图像。

还有一个问题，你把prepareToReadImage放在哪里？

您需要将其放置在func imagePickerController中，如下所示：

extension ViewController: UIImagePickerControllerDelegate {
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
let mediaType = info[UIImagePickerController.InfoKey.mediaType] as? String

if CFStringCompare(mediaType as CFString?, kUTTypeImage, CFStringCompareFlags(rawValue: 9)) == .compareEqualTo {
let originalImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage
prepareToReadImage(originalImage)
}

picker.dismiss(animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
serialQueue.async {
self.recognizerRunner?.resetState()
}
dismiss(animated: true, completion: nil)
}
}

最后，在开始扫描过程之前，请确保放置了识别器的设置。

我添加了func setupRecognizerRunner，在这里我定义了你在代码块中所做的一切：

private func setupRecognizerRunner() {
blinkCardRecognizer = MBCBlinkCardRecognizer()
var recognizers = [MBCRecognizer]()

blinkCardRecognizer.extractCvv = false
blinkCardRecognizer.extractIban = false
blinkCardRecognizer.extractExpiryDate = false

recognizers.append(blinkCardRecognizer)
let recognizerCollection = MBCRecognizerCollection(recognizers: recognizers)
recognizerRunner = MBCRecognizerRunner(recognizerCollection: recognizerCollection)

recognizerRunner?.scanningRecognizerRunnerDelegate = self
}

在加载了许可证密钥方法之后，我将其放置在viewDidLoad()中。

Answer 2

删除以下行使我能够获得.valid响应：

image?.cameraFrame = true