Triangle UIView - Swift

Question

So I\'m making a game in which I am dropping objects which have to be destroyed by a spike(triangle) at the bottom of the screen by a user.

I cannot work out how to

Answer 1

CAShapeLayer it can change the shape of layers.

    var mask = CAShapeLayer()
    mask.frame = self.layer.bounds

    let width = self.layer.frame.size.width
    let height = self.layer.frame.size.height

    var path = CGPathCreateMutable()

    CGPathMoveToPoint(path, nil, 30, 0)
    CGPathAddLineToPoint(path, nil, width, 0)
    CGPathAddLineToPoint(path, nil, width, height)
    CGPathAddLineToPoint(path, nil, 0, height)
    CGPathAddLineToPoint(path, nil, 30, 0)

    mask.path = path

    // CGPathRelease(path); - not needed

    self.layer.mask = mask

    var shape = CAShapeLayer()
    shape.frame = self.bounds
    shape.path = path
    shape.lineWidth = 3.0
    shape.strokeColor = UIColor.whiteColor().CGColor
    shape.fillColor = UIColor.clearColor().CGColor

    self.layer.insertSublayer(shape, atIndex: 0)