swfit3.0 画像の塗りつぶし

画像の塗りつぶしの自分用メモ 未検証

       let size = CGSize(width: 150, height: 150)
        UIGraphicsBeginImageContext(size)
        let cgContextRef = UIGraphicsGetCurrentContext()
        cgContextRef!.setFillColor(UIColor.gray.cgColor)
        cgContextRef!.setAlpha(0.8)
        cgContextRef!.fill(CGRect(x: 0, y: 0, width: 300, height: 300))
        let colorImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        let view5: UIImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
        view5.image = colorImage