How can I show a fraction with SwiftUI-CodePudding

I am trying to represent a fraction with denominator larger than 9 in a SwiftUI Text.

I can implement this using individual elements and applying offsets but that get's a bit messy as the fractions change dynamically.

Is there a way to do this using attributedText?

I came across thi UIFont extension with deprecated methods and wondering if anything similar that can be used with SwiftUI:

extension UIFont {
    static func fractionFont(ofSize pointSize: CGFloat) -> UIFont {
        let systemFontDesc = UIFont.systemFont(ofSize: pointSize).fontDescriptor
        let fractionFontDesc = systemFontDesc.addingAttributes(
            [
                UIFontDescriptor.AttributeName.featureSettings: [
                    [
                        UIFontDescriptor.FeatureKey.featureIdentifier: kFractionsType,
                        UIFontDescriptor.FeatureKey.typeIdentifier: kDiagonalFractionsSelector,
                    ], ]
            ] )
        return UIFont(descriptor: fractionFontDesc, size:pointSize)
    }
}

CodePudding user response：

UIFont is toll-free-bridged with CTFont, which means you can cast a UIFont to a CTFont by saying as CTFont. And SwiftUI's Font has an initializer that takes a CTFont.

So, using the fractionFont(ofSize:) method you posted, this playground code:

PlaygroundPage.current.setLiveView(
    Text("The fraction 21/345 is rendered nicely.")
        .font(Font(UIFont.fractionFont(ofSize: UIFont.systemFontSize) as CTFont))
        .padding()
)

produces this result:

$the string "The fraction 21/345 is rendered nicely", with 21 in smaller, raised characters and 345 in smaller, lowered characters$