Le dessin d'une ligne Swift 3.x avec UIBezierPath

Je suis en train de dessiner une ligne sur une UIView avec un UIBezierpath. Je pense que je vais rater quelque chose, mais n'a pas réussi à la trouver.

Voici mon code:

//Code for touch recognition
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
swiped = false
if let touch = touches.first as? UITouch? {
lastPoint = (touch?.location(in: fullview))!
//print(lastPoint)
    }
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
swiped = true
if let touch = touches.first as? UITouch? {
let currentPoint = touch?.location(in: fullview)
drawLineFrom(fromPoint: lastPoint, toPoint: currentPoint!)
lastPoint = currentPoint!
//print(lastPoint)
        //print("touch moved")
    }
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
if !swiped {
drawLineFrom(fromPoint: lastPoint, toPoint: lastPoint)
}
//print("touch ended")
}
//code for drawing
func drawLineFrom(fromPoint: CGPoint, toPoint: CGPoint){
UIGraphicsBeginImageContext(fullview.frame.size)
let context = UIGraphicsGetCurrentContext()
let aPath = UIBezierPath()
//aPath.move(to: fromPoint)
    //aPath.addLine(to: toPoint)
    aPath.lineWidth=10.0
aPath.lineJoinStyle = .round
aPath.move(to: CGPoint(x:15,y:15))
aPath.addLine(to: CGPoint(x:80,y:80))
aPath.addClip()
aPath.close()
UIColor.green.set()
aPath.stroke()
//print("drawline")
    //print("Frompoint = ",fromPoint)
    //print("topoint = ",toPoint)

/*  context?.setLineCap(.round)
context?.setLineWidth(brushWidth)
context?.setStrokeColor(red: red, green: green, blue: blue, alpha: 1.0)
context?.setBlendMode(.normal)
context?.beginPath()
context?.move(to: fromPoint)
context?.addLine(to: toPoint)
context?.closePath()
context?.strokePath()*/
//let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
fullview.setNeedsDisplay()
}

Comme vous pouvez le voir, j'ai essayé aussi avec le contexte, mais ça ne marchait pas trop.