draw line using uibezierPath in a vertical way - swift

Question

My swift code below draws a horiziontal way the horizontal line is at a angle that does not change. Think like a x axis. I want to draw a line in the exact opposite way. Think of the y axis. The line is drawn at
bezier.addLine(to: CGPoint(x: point.x, y: startPoint!.y))
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var imageView: UIImageView!
var startPoint: CGPoint?
let shapeLayer: CAShapeLayer = {
let shapeLayer = CAShapeLayer()
shapeLayer.lineWidth = 4
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.strokeColor = UIColor.blue.cgColor
return shapeLayer
}()
override func viewDidLoad() {
super.viewDidLoad()
imageView.backgroundColor = .systemOrange
imageView.layer.addSublayer(shapeLayer)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first
startPoint = touch?.location(in: imageView)
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
guard var touch = touches.first else { return }
if let predicted = event?.predictedTouches(for: touch)?.last {
touch = predicted
}
updatePath(in: imageView, to: touch)
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
updatePath(in: imageView, to: touch)
let image = UIGraphicsImageRenderer(bounds: imageView.bounds).image { _ in
imageView.drawHierarchy(in: imageView.bounds, afterScreenUpdates: true)
}
shapeLayer.path = nil
imageView.image = image
}
}
private extension ViewController {
func updatePath(in view: UIView, to touch: UITouch) {
let point = touch.location(in: view)
guard view.bounds.contains(point) else { return }
let bezier = UIBezierPath()
bezier.move(to: startPoint!)
bezier.addLine(to: CGPoint(x: point.x, y: startPoint!.y))
shapeLayer.path = bezier.cgPath
}
}

Answer 1

Actually you move on to startPoint and trying to add line to the same static point ... how it can add line to the same point on which you are currently residing ... add some value to Y while static X position position to add line
bezier.move(to: startPoint!)
bezier.addLine(to: CGPoint(x: startPoint!.x, y: point.y))