     toViewController.view.layer.mask = maskLayer      let quadraticEndFrame = CGRect(x: endFrame.origin.x - (endFrame.height - endFrame.width)/0, y: endFrame.origin.y, width: endFrame.height, height: endFrame.height)     let bigCirclePath = UIBezierPath(ovalInRect: quadraticEndFrame)      let pathAnimation = CABasicAnimation(keyPath: "path")     