When setting QRCode's backgroundColor clear. It comes out to be black background.

[LoKiLyn]

No description provided.

[viniciusromani]

Same problem here. Any idea of a fix or a workaround?

[viniciusromani]

Hey @LoKiLyn I've got a workaround over here, I still didn't find a reasonable explanation to why this is happening though. This is what I came up with:

func applyTransaparentBackground() -> UIImage? {
        guard let rawImageReference = self.cgImage else { return self }
        let colorMasking: [CGFloat] = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
        UIGraphicsBeginImageContext(self.size)
        guard let maskedImageReference = rawImageReference.copy(maskingColorComponents: colorMasking) else { return self }
        guard let context = UIGraphicsGetCurrentContext() else { return self }
        context.translateBy(x: 0.0, y: self.size.height)
        context.scaleBy(x: 1.0, y: -1.0)
        context.draw(maskedImageReference, in: CGRect(origin: CGPoint.zero, size: self.size))
        let finalImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return finalImage
    }

It basically masks all cg image colors to some other color based on 255 scale, this is mapped on that array called colorMasking (Credits go to: ankmara at https://stackoverflow.com/questions/35044784/changing-color-from-white-to-transparent-uiimage). This is not an ideal solution but it solves our problem.

PS. The function is inside an UIImage Extension in my project. It needs to be there otherwise, you should replace self to an UIImage object.

Best,

[LoKiLyn]

@viniciusromani
Thanks for ur share! Your solution solved my problem.
I guess the problem is that the lib used some function unsupported below iOS 9.
I used the following to partly resolve the problem.

    var qrCode = 🔳(self.wifiInformation)
     if #available(iOS 9, *) {
           qrCode.backgroundColor = CIColor(color: UIColor.clear)
        } else {
            // error backgroundColor with UIColor.clear at 8.2
            qrCode.backgroundColor = CIColor(color: color4)
     }

I'll look into it later. ^-^