Bezier animation to reveal and conceal a checkmark with Swift - ios

Question

In my app I have a checkmark inside a UIView which I reveal or conceal depending on the button the user clicks on to create the effect that the checkmark is being drawn or erased. I am using Bezier path with a mask to animate the checkmark being revealed or concealed with the code shown below. However, in the code to conceal it, the checkmark is being concealed from right to left and I would like to do it from left to right. What am I missing?
Code to reveal the checkmark
func checkmarkAnimationToReveal(view: UIView) {
let path = UIBezierPath(rect: CGRectMake(0, 0, view.bounds.width / 10, view.bounds.height))
let mask = CAShapeLayer()
mask.anchorPoint = CGPointMake(0.5, 1.0)
mask.path = path.CGPath
view.layer.mask = mask
let anim = CABasicAnimation(keyPath: "path")
anim.fromValue = path.CGPath
anim.toValue = UIBezierPath(rect:view.bounds).CGPath
anim.duration = 1.0
anim.fillMode = kCAFillModeForwards
anim.removedOnCompletion = false
view.layer.mask!.addAnimation(anim, forKey: "anim")
}
Code to conceal the checkmark
func checkmarkAnimationToConceal(view: UIView) {
CATransaction.begin()
CATransaction.setCompletionBlock({
print("completion reached")
self.checkmarkLabel.hidden = true
})
let path = UIBezierPath(rect: CGRectMake(0, 0, view.bounds.width / 10, view.bounds.height))
let mask = CAShapeLayer()
mask.anchorPoint = CGPointMake(0.5, 1.0)
mask.path = path.CGPath
view.layer.mask = mask
let anim = CABasicAnimation(keyPath: "path")
anim.fromValue = UIBezierPath(rect:view.bounds).CGPath
anim.toValue = path.CGPath
anim.duration = 1.0
anim.fillMode = kCAFillModeRemoved
anim.removedOnCompletion = false
view.layer.mask!.addAnimation(anim, forKey: "anim")
}