HeadGazeLib is a pure Swift library to empower iOS app control through head gaze without a finger touch.

Any iOS developer who would like to introduce head-based control to their app. Ideal for accessibility and game control.

iPhone X, iOS 11, Swift 4

1. Simply copy and paste the entire folder HeadGazeLib to your xcode project.
2. Extend your ViewController from UIHeadGazeViewController and change the button outlet reference class from UIButton to UIHoverableButton or UIBubbleButton

class MyViewController: UIHeadGazeViewController{
    @IBOutlet weak var myButton: UIBubbleButton! // UIButton!
}

3. Similarily, change the button class from UIButton to UIHoverableButton or UIBubbleButton in the identity inspector of storyboard

4. Define head gaze even handler through UIHeadGazeRecognizer instance in MyViewController class

class MyViewController: UIHeadGazeViewController{
//.....
  private var headGazeRecognizer: UIHeadGazeRecognizer? = nil

  override func viewDidLoad() {
    super.viewDidLoad()
    setupGestureRecognizer()
  }
  private func setupGestureRecognizer() {
    // add head gaze recognizer to handle head gaze event
    self.headGazeRecognizer = UIHeadGazeRecognizer()
    super.virtualCursorView?.smoothness = 9
    super.virtualCursorView?.addGestureRecognizer(headGazeRecognizer)
    self.headGazeRecognizer?.move = { [weak self] gaze in

        self?.buttonAction(button: (self?.myButton)!, gaze: gaze)

    }
  }
  private func buttonAction(button: UIButton, gaze: UIHeadGaze){
    guard let button = button as? UIHoverableButton else { return }
    button.hover(gaze: gaze)
  }
//....
}

For working demo, we have prepared two examples:

1. HeadSwipe: Swipe daily deal on eBay with head control
2. Sensitivity: Head control sensitivity analysis app is used to track the location and timestamp of the cursor as user is "clicking" the button. Useful for user study.

Copyright 2018 eBay Inc.
HeadGazeLib is available under the MIT license. See the LICENSE file for more info.

Jinrong Xie, Muratcan Cicek, Robinson Piramuthu