Swift - How to create a view with a shape cropped in it

Question

I\'m trying to achieve the result shown in the image using swift 1.2 and xcode 6.

Basically I want to create a view with a shape cut in it to be able to see the the

Answer 1

Here is sample code for how you can make a circle Mask for a UIView:

let sampleView = UIView(frame: UIScreen.mainScreen().bounds)
let maskLayer = CALayer()
maskLayer.frame = sampleView.bounds
let circleLayer = CAShapeLayer()
//assume the circle's radius is 100
circleLayer.frame = CGRectMake(sampleView.center.x - 100, sampleView.center.y - 100, 200, 200)
let circlePath = UIBezierPath(ovalInRect: CGRectMake(0, 0, 200, 200))
circleLayer.path = circlePath.CGPath
circleLayer.fillColor = UIColor.blackColor().CGColor
maskLayer.addSublayer(circleLayer)

sampleView.layer.mask = maskLayer

Here is what I made in the playground: