String+QRCode.swift

//Reference: http://stackoverflow.com/questions/12051118/is-there-a-way-to-generate-qr-code-image-on-ios#comment48548881_22296488

import Foundation
import UIKit
extension String{
    var qrcode: CIImage {
        //let data = self.dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: false)
        let data = self.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
        let filter = CIFilter(name: "CIQRCodeGenerator")
        filter.setValue(data, forKey: "inputMessage")
        filter.setValue("Q", forKey: "inputCorrectionLevel")
        let image = filter.outputImage
        //fix blurry: http://stackoverflow.com/questions/12051118/is-there-a-way-to-generate-qr-code-image-on-ios#comment48548881_22296488
        let transform = CGAffineTransformMakeScale(5.0, 5.0)
        return image.imageByApplyingTransform(transform)
    }
}