ProfileApp_QRImageSend.swift

@IBAction func pushImmageButton(_ sender: Any) {
        let ciFilter = CIFilter(name: "CIQRCodeGenerator")
        ciFilter?.setDefaults()
        let baseUrlString="https://twitter.com/"
        
        let qrString = baseUrlString+textField.text!
        
        let data = qrString.data(using: String.Encoding.utf8)
        ciFilter?.setValue(data, forKey: "inputMessage")
        ciFilter?.setValue("L", forKey: "inputCorrectionLevel")
        let ciContext = CIContext()
        let sizeTransform = CGAffineTransform(scaleX: 4, y: 4)
        let cgimg = ciContext.createCGImage((ciFilter?.outputImage)!, from: (ciFilter?.outputImage?.extent)!)
        
        /////////////////
        let qrcodeImage: CIImage = (ciFilter?.outputImage!.transformed(by: sizeTransform))!
        // CIImageからUIImageに変換する
        let imageContext = CIContext(options:nil)
        let temp:CGImage = imageContext.createCGImage(qrcodeImage, from: qrcodeImage.extent)!
        let ret = UIImage(cgImage: temp)
        
        // ファイルパスを指定する
        var imagePath: String {
            let doc = NSSearchPathForDirectoriesInDomains( .documentDirectory, .userDomainMask, true )[0] as String
            return ( doc as NSString ).appendingPathComponent("qr_send.jpg" )
        }
        
        // 指定したファイルパスに保存する
        let senddata: NSData = ret.jpegData(compressionQuality: 0.9) as! NSData
        senddata.write( toFile: imagePath, atomically: true )
        
        let transferFile: NSURL = NSURL( fileURLWithPath: imagePath )
        wcSession.transferFile( transferFile as URL, metadata: qrcodeImage.properties )
        //送信終わり
}