Convert SwiftUI Color to UIColor

Question

Convert SwiftUI Color to UIColor

I want to convert SwiftUI view Color to UIKit UIcolor component. I have tried several ways and also refer the StackOverflow already given answers, But they did not work. It was also mentioned by some users in those posts. I have gone through the below code which is proposed by turingtested

but this is not working. Any suggestions or help is really appreciated.

fileprivate extension Color {
    func uiColor() -> UIColor {
        let components = self.components()
        return UIColor(red: components.r, green: components.g, blue: components.b, alpha: components.a)
    }
    private func components() -> (r: CGFloat, g: CGFloat, b: CGFloat, a: CGFloat) {
        let scanner = Scanner(string: self.description.trimmingCharacters(in: CharacterSet.alphanumerics.inverted))
        var hexNumber: UInt64 = 0
        var r: CGFloat = 0.0, g: CGFloat = 0.0, b: CGFloat = 0.0, a: CGFloat = 0.0
        let result = scanner.scanHexInt64(&hexNumber)
        if result {
            r = CGFloat((hexNumber & 0xff000000) >> 24) / 255
            g = CGFloat((hexNumber & 0x00ff0000) >> 16) / 255
            b = CGFloat((hexNumber & 0x0000ff00) >> 8) / 255
            a = CGFloat(hexNumber & 0x000000ff) / 255
        }
    return (r, g, b, a)
    }
}

swift

swiftui

swift5

asked on Stack Overflow Jan 10, 2020 by

Jasmine Chaniara • edited Jan 10, 2020 by

Mahmoud Adam

3 Answers

If you are looking for an up-to-date answer:

From iOS 14 onward, the UIColor class has an initializer, which takes a SwiftUI color as argument: UIColor(Color.red).

answered on Stack Overflow Jul 30, 2020 by

mmi

Basically, Apple doesn't intend for you to do this conversion. SwiftUI's Color is a View, and the design of the framework is that data flows to a View, which is then displayed. You are never supposed to extract data back from a View.

If you find yourself needing to use the components of a color, you should work with UIColor, and then convert to Color at the time you are ready to display it.

If you are trying to get the components of system colors like Color.red, I believe they are the same as the adaptive UIColor.systemRed, which does have accessible components.

Standard Colors documentation

answered on Stack Overflow Jan 10, 2020 by

John M.

Update your answer to this to get rid of the long tuple warning and it works fine.

extension Color {
    func uiColor() -> UIColor {
        if #available(iOS 14.0, *) {
            return UIColor(self)
        }

        let scanner = Scanner(string: description.trimmingCharacters(in: CharacterSet.alphanumerics.inverted))
        var hexNumber: UInt64 = 0
        var r: CGFloat = 0.0, g: CGFloat = 0.0, b: CGFloat = 0.0, a: CGFloat = 0.0

        let result = scanner.scanHexInt64(&hexNumber)
        if result {
            r = CGFloat((hexNumber & 0xFF000000) >> 24) / 255
            g = CGFloat((hexNumber & 0x00FF0000) >> 16) / 255
            b = CGFloat((hexNumber & 0x0000FF00) >> 8) / 255
            a = CGFloat(hexNumber & 0x000000FF) / 255
        }
        return UIColor(red: r, green: g, blue: b, alpha: a)
    }
}

answered on Stack Overflow Nov 24, 2020 by

Stritt

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