Crop Part of CALayer

Question

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I want to crop out the Red triangle part from the CAshapelayer.

This is the code i used for drawing it:

Radial Gradient background in Swift and my code is:

let bgLayer = RadialGradientLayer(center: speed_dial_center_point, radius: speed_dial_size.width/2, colors: [UIColor.clear.cgColor,UIColor(red: 211/255, green: 211/255, blue: 211/255, alpha: 0.5).cgColor],speed_scale_margin: speed_scale_margin)//CALayer()
            bgLayer.frame = CGRect(origin: rect.origin, size: speed_dial_size)
            bgLayer.contentsScale = self.layer.contentsScale
            bgLayer.setNeedsDisplay()
            backgondArc_Layer.addSublayer(bgLayer)
            self.layer.insertSublayer(backgondArc_Layer, below: speed_dial_layer)

Answer 1

So add a mask layer to your gradient layer that masks out the part you want to remove.