remove all drawing in imageview UIGraphicsGetImageFromCurrentImageContext - swift

Question

I want to remove everything written imageview pic. I have tried something like pic.Clear() but its not being recognized. I dont know what else to do. The only other thing I can think off is to somehow create a variable that is like a line because I cant access the lines right now outside of the func they are in now. I am trying to do this is in clearM. Using UIGraphicsGetImageFromCurrentImageContext has something to do with this. I dont want to use pencil kit.
import UIKit
class ViewController: UIViewController {
var startPoint: CGPoint?
var statPoint = CGPoint.zero
var swipe = false
var pic = UIImageView()
var clearBtn = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
[pic,clearBtn].forEach {
$0.translatesAutoresizingMaskIntoConstraints = false
view.addSubview($0)
}
pic.backgroundColor = .brown
clearBtn.backgroundColor = .blue
pic.frame = CGRect(x: 100, y: 100, width: 250, height: 250)
clearBtn.frame = CGRect(x: 100, y: 350, width: 50, height: 50)
clearBtn.addTarget(self, action: #selector(clearM), for: .touchDown)
}
#objc func clearM(){
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else {
return}
swipe = false
statPoint = touch.location(in: self.pic)
}
var score = 0
func drawLine(from fromPoint: CGPoint, to toPoint : CGPoint) {
UIGraphicsBeginImageContext( pic.frame.size)
guard let context = UIGraphicsGetCurrentContext() else {
return
}
pic.image?.draw(in: pic.bounds)
context.move(to: fromPoint)
context.addLine(to: toPoint)
context.setLineCap(.round)
context.setLineWidth(5)
context.setStrokeColor(UIColor.black.cgColor)
context.strokePath()
pic.image = UIGraphicsGetImageFromCurrentImageContext()
pic.alpha = 1
UIGraphicsEndImageContext()
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else {
return
}
swipe = true
let currentPoint = touch.location(in: pic)
drawLine(from: statPoint, to: currentPoint)
statPoint = currentPoint
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
if !swipe {
drawLine(from: statPoint, to: statPoint)
}
UIGraphicsBeginImageContext(pic.frame.size)
pic.image?.draw(in: pic.bounds, blendMode: .normal, alpha: 1)
pic.image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
}
}