상단 필렛 - 샘플 설치 (발췌)

        self.itemImageView.image = UIImage(data:data)
        let maskPath = UIBezierPath(roundedRect: self.bounds,
                                        byRoundingCorners: [.TopLeft, .TopRight],
                                        cornerRadii: CGSize(width: 5.0, height: 5.0))
        let maskLayer = CAShapeLayer()
        maskLayer.path = maskPath.CGPath
        self.layer.mask = maskLayer;

        self.itemImageView.layer.masksToBounds = true
        self.itemImageView.layer.mask = maskLayer

하단 필렛 - 예제 설치(발췌)

    self.layer.cornerRadius = 5.0

결과