This pod contains a ready to use view controller for document scanning. Yes we scan!

• Requirements
• Scanner Preview
• Installation
  • CocoaPods
  • Carthage
  • Swift Package Manager
• Usage
  • Scanner View Controller
  • Delegate Methods
  • Scanner Quality
  • Image Features needed before automatically capture
  • UI Configuration
  • Performance hint
  • Siri Shortcuts
  • Using the scanner directly
• License

iOS 13 notice

iOS 13 contains the VNDocumentCameraViewController, which is an Apple-provided class that is likely to achieve better results and have less bugs than this pod.

If your app is targeting iOS 13 or higher, please consider using it instead of this pod.

Requirements

• iOS 10.0 SDK or later

Xcode Version	YesWeScan
<= 10.1	<= 1.3.0
>= 10.2	=> 2.0.0

Scanner Preview

Installation

CocoaPods

YesWeScan is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'YesWeScan', ~> '2.0'

Carthage

YesWeScan is also available via Carthage. Add the following line to your Cartfile:

github "adorsys/YesWeScan"

Swift Package Manager

Starting in version 2.2.0, Swift Package Manager is also supported 🎉

Add it to your project like this:

dependencies: [
    .package(url: "https://github.com/adorsys/YesWeScan.git", from: "2.2.0")
]

Usage

The scanner needs access to the camera. In order to allow this, your Info.plist must contain the NSCameraUsageDescription key.

Scanner View Controller

The main class in this project is ScannerViewController. You can access it with import YesWeScan.

import YesWeScan

class ViewController: UIViewController {
  var scannedImage: UIImage?

  override func viewDidLoad() {
    super.viewDidLoad()

    let scanner = ScannerViewController()
    scanner.delegate = self
    navigationController?.pushViewController(scanner, animated: true)
  }
}

Delegate Methods

The scanner will not capture images without a delegate. You should therefore set the delegate property of the ScannerViewController.

You will then receive calls when the scanner found an image of suitable quality:

extension ViewController: ScannerViewControllerDelegate {
  func scanner(_ scanner: ScannerViewController, didCaptureImage image: UIImage) {
    scannedImage = image
    navigationController?.popViewController(animated: true)
  }
}

Scanner Quality

You can customize the scanner's accuracy using the jitter property. Higher values will make it easier to capture an image, but it won't be as steady.

The default value here is 100.

The Scanner resolution can be configured by passing the ScannerViewController an AVCaptureSession.Preset during initialization. The default value is .high. If the given preset isn't supported by the capture device, it'll fall back to the default value.

Image Features needed before automatically capture

You can change the variable scanningQuality to control the scanning quality of the image. Changes to scanningQuality will influence the number of features required before taking a capture.

enum Quality {
  case high, medium, fast
}

The default value is .medium and this variable is available in ScannerViewController.

scanner.scanningQuality = .fast

UI Configuration

The scanner's UI can be configured using the initializer:

ScannerViewController(config: [.torch, .manualCapture])

The following options are available:

• .targetBraces: A button to toggle targeting braces
• .torch: A button for controlling the torch
• .manualCapture: A manual camera shutter
• .progressBar: Show a progress bar for the current scan

The default value here is .all.

You can also configure the previewColor (color of scan preview rect) and braceColor (color of the target finder braces).

The defaults here are UIColor.green and UIColor.red, respectively.

Siri Shortcuts

The scanner example project supports Siri Shortcuts since iOS 12*. The User own shortcut opens the app and navigates to the Document Scanner. You can find the implementation in the example project.

The implementation works as follows: Activate Siri in the project and add a NSUserActivityTypes identifier in info.plist. Then activate Siri Shortcut adding following lines in the project:

if #available(iOS 12.0, *) {
  let identifier = Bundle.main.userActivityIdentifier
  let activity = NSUserActivity(activityType: identifier)
  activity.title = "The String the User will see in preferences"
  activity.userInfo = ["Document Scanner": "open document scanner"]
  activity.isEligibleForSearch = true
  activity.isEligibleForPrediction = true
  activity.persistentIdentifier = NSUserActivityPersistentIdentifier(identifier)
  view.userActivity = activity
  activity.becomeCurrent()
}

To call a specific function, like openDocumentScanner(), add this to AppDelegate:

func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
  if #available(iOS 12.0, *) {
    guard userActivity.activityType == Bundle.main.userActivityIdentifier,
      let navigationController = window?.rootViewController as? UINavigationController,
      let viewController = navigationController.children.first as? ViewController else {
        return false
    }
    viewController.openDocumentScanner()
    return true
  } else {
    return false
  }
}

Using the scanner directly

It's also possible to use the scanner class without the ScannerViewController class (that is part of this pod) directly.

As an example how to do this, take a look at the CustomUIViewController class.

License

YesWeScan is released under the Apache 2.0 License. Please see the LICENSE file for more information.