CGColor and UIDeviceRGBColor leaks - swift

Question

I have a weird problem - the Xcode issue navigator reports that my app leaks CGColor and UIDeviceRGBColor.
The class in which this occurs seems fairly simple to me, but hoping someone can point me in the right direction.
import Foundation
internal enum TriangleDirection {
case up
case down
}
class TriangleView: UIView {
let size: CGFloat = 12.0
var direction: TriangleDirection = .up
var colour = UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 0.7)
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
myInit()
}
override init(frame: CGRect) {
super.init(frame: frame)
myInit()
}
func myInit() {
backgroundColor = UIColor.clear
}
// change to up or down
func set(direction: TriangleDirection, colour: UIColor = UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 0.7)) {
self.direction = direction
self.colour = colour
setNeedsDisplay()
}
override func draw(_ rect: CGRect) {
// general declarations
let context = UIGraphicsGetCurrentContext()
let origin = CGPoint(x: 0, y: 0)
// draw triangle
context!.saveGState()
context!.translateBy(x: origin.x, y: origin.y)
let trianglePath = UIBezierPath()
// draw depending on direction...
if direction == .up {
trianglePath.move(to: CGPoint(x: size/2, y: 0))
trianglePath.addLine(to: CGPoint(x: size, y: (size * 0.8)))
trianglePath.addLine(to: CGPoint(x: 0.0, y: (size * 0.8)))
} else {
trianglePath.move(to: CGPoint(x: size/2, y: (size * 0.8)))
trianglePath.addLine(to: CGPoint(x: 0, y: 0))
trianglePath.addLine(to: CGPoint(x: size, y: 0))
}
trianglePath.close()
colour.setFill()
trianglePath.fill()
context!.restoreGState()
}
override var intrinsicContentSize: CGSize {
return CGSize(width: size, height: size)
}
}
Issue Navigator warnings