Touch drawing not working when UIPanGestureRecognizer implemented for view - ios

Question

I have screen to test the device touch screen with popping bubbles. And some imageView added in subviews of bubbles made of cross for them. Then user swipe over the bubbles to check the touch screen.
And I want drawing on the same view. When user swipes the finger over the bubbles, a line will be drawn. I have separate class for drawing and assign it to main parent view of controller.
If I remove code for UIPanGestureRecognizer then drawing works and there are no lags.
If I add gesture to view for popping the bubbles like this
view.addGestureRecognizer(gestureRecognizer)
Then there is a lag, and drawing doesn't work.
I want both things like popping bubbles and drawing on view.
The main problem of this gesture is when I add this in view, then drawing works without any lag but popping bubbles doesn't work.
let gestureRecognizer : UIPanGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognized(_:)))
gestureRecognizer.maximumNumberOfTouches = 1
gestureRecognizer.minimumNumberOfTouches = 1
view.addGestureRecognizer(gestureRecognizer)
Drawing view class
import UIKit
class DrawingView: UIView {
var drawColor = UIColor.black
var lineWidth: CGFloat = 5
private var lastPoint: CGPoint!
private var bezierPath: UIBezierPath!
private var pointCounter: Int = 0
private let pointLimit: Int = 128
private var preRenderImage: UIImage!
// MARK: - Initialization
override init(frame: CGRect) {
super.init(frame: frame)
initBezierPath()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initBezierPath()
}
func initBezierPath() {
bezierPath = UIBezierPath()
bezierPath.lineCapStyle = CGLineCap.round
bezierPath.lineJoinStyle = CGLineJoin.round
}
// MARK: - Touch handling
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch: AnyObject? = touches.first
lastPoint = touch!.location(in: self)
pointCounter = 0
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch: AnyObject? = touches.first
let newPoint = touch!.location(in: self)
bezierPath.move(to: lastPoint)
bezierPath.addLine(to: newPoint)
lastPoint = newPoint
pointCounter += 1
if pointCounter == pointLimit {
pointCounter = 0
renderToImage()
setNeedsDisplay()
bezierPath.removeAllPoints()
}
else {
setNeedsDisplay()
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
pointCounter = 0
renderToImage()
setNeedsDisplay()
bezierPath.removeAllPoints()
}
override func touchesCancelled(_ touches: Set<UITouch>?, with event: UIEvent?) {
touchesEnded(touches!, with: event)
}
// MARK: - Pre render
func renderToImage() {
UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, 0.0)
if preRenderImage != nil {
preRenderImage.draw(in: self.bounds)
}
bezierPath.lineWidth = lineWidth
drawColor.setFill()
drawColor.setStroke()
bezierPath.stroke()
preRenderImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
}
// MARK: - Render
override func draw(_ rect: CGRect) {
super.draw(rect)
if preRenderImage != nil {
preRenderImage.draw(in: self.bounds)
}
bezierPath.lineWidth = lineWidth
drawColor.setFill()
drawColor.setStroke()
bezierPath.stroke()
}
// MARK: - Clearing
func clear() {
preRenderImage = nil
bezierPath.removeAllPoints()
setNeedsDisplay()
}
// MARK: - Other
func hasLines() -> Bool {
return preRenderImage != nil || !bezierPath.isEmpty
}
}