Get UIFont with smallCaps feature (Swift 5.6, Xcode 13.3)

UIFont+smallCaps.swift

extension UIFont {

	var withSmallCaps: UIFont {
		let upperCaseFeature = [
			UIFontDescriptor.FeatureKey.type : kUpperCaseType,
			UIFontDescriptor.FeatureKey.selector : kUpperCaseSmallCapsSelector
		]
		let lowerCaseFeature = [
			UIFontDescriptor.FeatureKey.type : kLowerCaseType,
			UIFontDescriptor.FeatureKey.selector : kLowerCaseSmallCapsSelector
		]
		let features = [upperCaseFeature, lowerCaseFeature]
		let smallCapsDescriptor = fontDescriptor.addingAttributes([.featureSettings : features])
		return UIFont(descriptor: smallCapsDescriptor, size: pointSize)
	}
}