45 lines
2.1 KiB
Swift
45 lines
2.1 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import UIKit
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enum QRCode {
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/// Generates a QRCode for the give string
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///
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/// **Note:** If the `hasBackground` value is true then the QRCode will be black and white and
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/// the `withRenderingMode(.alwaysTemplate)` won't work correctly on some iOS versions (eg. iOS 16)
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static func generate(for string: String, hasBackground: Bool) -> UIImage {
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let data = string.data(using: .utf8)
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var qrCodeAsCIImage: CIImage
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let filter1 = CIFilter(name: "CIQRCodeGenerator")!
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filter1.setValue(data, forKey: "inputMessage")
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qrCodeAsCIImage = filter1.outputImage!
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guard !hasBackground else {
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let filter2 = CIFilter(name: "CIFalseColor")!
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filter2.setValue(qrCodeAsCIImage, forKey: "inputImage")
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filter2.setValue(CIColor(color: .black), forKey: "inputColor0")
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filter2.setValue(CIColor(color: .white), forKey: "inputColor1")
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qrCodeAsCIImage = filter2.outputImage!
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let scaledQRCodeAsCIImage = qrCodeAsCIImage.transformed(by: CGAffineTransform(scaleX: 6.4, y: 6.4))
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return UIImage(ciImage: scaledQRCodeAsCIImage)
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}
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let filter2 = CIFilter(name: "CIColorInvert")!
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filter2.setValue(qrCodeAsCIImage, forKey: "inputImage")
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qrCodeAsCIImage = filter2.outputImage!
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let filter3 = CIFilter(name: "CIMaskToAlpha")!
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filter3.setValue(qrCodeAsCIImage, forKey: "inputImage")
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qrCodeAsCIImage = filter3.outputImage!
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let scaledQRCodeAsCIImage = qrCodeAsCIImage.transformed(by: CGAffineTransform(scaleX: 6.4, y: 6.4))
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// Note: It looks like some internal method was changed in iOS 16.0 where images
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// generated from a CIImage don't have the same color information as normal images
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// as a result tinting using the `alwaysTemplate` rendering mode won't work - to
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// work around this we convert the image to data and then back into an image
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let imageData: Data = UIImage(ciImage: scaledQRCodeAsCIImage).pngData()!
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return UIImage(data: imageData)!
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}
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}
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