Code to mask a square image to a circle

CropImageToCircle.swift

// UIImage+Utils.swift

// This is just one way to do this.
public func croppedToCircle() -> UIImage {
    // Begin a new image that will be the new image with the rounded corners
    UIGraphicsBeginImageContextWithOptions(size, false, scale)
    
    let circleWidth = size.width
    let radius = circleWidth / 2
	
    // draw the image here
    let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
    UIBezierPath(roundedRect: rect, cornerRadius: radius).addClip()
    draw(in: rect)

    let newImage: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    if let newImage = newImage {
        return newImage
    } else {
        return self
    }
}