How to prevent back button from dissapearing? - swift

Question

I am creating a doodle page with an "X" as the close/dismiss button.
I also have a "clear" button to remove the doodles that have been made.
My issue is that when I press clear, even the X button disappears, how do I prevent this from happening?
This is my current app.
This is my Doodle class which allows me to draw on the view.
import UIKit
class DoodleView: UIView {
var lineColor:UIColor!
var lineWidth:CGFloat!
var path:UIBezierPath!
var touchPoint:CGPoint!
var startingPoint:CGPoint!
override func layoutSubviews() {
self.clipsToBounds = true
self.isMultipleTouchEnabled = false
lineColor = UIColor.white
lineWidth = 10
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first
startingPoint = touch?.location(in: self)
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first
touchPoint = touch?.location(in: self)
path = UIBezierPath()
path.move(to: startingPoint)
path.addLine(to: touchPoint)
startingPoint = touchPoint
drawShapeLayer()
}
func drawShapeLayer() {
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath
shapeLayer.strokeColor = lineColor.cgColor
shapeLayer.lineWidth = lineWidth
shapeLayer.fillColor = UIColor.clear.cgColor
self.layer.addSublayer(shapeLayer)
self.setNeedsDisplay()
}
func clearCanvas() {
path.removeAllPoints()
self.layer.sublayers = nil
self.setNeedsDisplay()
}
}
This is the class controlling the view controller.
import UIKit
class DoodlePageViewController: UIViewController {
#IBOutlet weak var doodleView: DoodleView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func clearDoodle(_ sender: Any) {
doodleView.clearCanvas()
}
#IBAction func CloseDoodlePage(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
}

Answer 1

Without really seeing how you declared the buttons, I can only guess that when you call the function clearCanvas(), the X button is part of the sublayer in doodle view since you are setting self.layer.sublayers = nil hence making it also dissapear.
Make sure that the X button is on top of the doodle view when you create it.

Answer 2

You are clearing all the subviews out of your view when you call self.layer.sublayers = nil
you either need to re-add the 'x' view back into the hierarchy. I am assuming using your function drawShapeLayer() is the 'x' ??
so it would be
func clearCanvas() {
path.removeAllPoints()
self.layer.sublayers = nil
drawShapeLayer()
self.setNeedsDisplay()
}