Monospaced numbers in iOS 15 beta 4

UIFont+Monospaced.swift

import UIKit

extension UIFont {
	public func withMonospacedNumbers() -> Self {
		let monospacedFeature: [UIFontDescriptor.FeatureKey: Any]

		if #available(iOS 15.0, *) {
			monospacedFeature = [
				.type: kNumberSpacingType,
				.selector: kMonospacedNumbersSelector
			]
		} else {
			monospacedFeature = [
				.featureIdentifier: kNumberSpacingType,
				.typeIdentifier: kMonospacedNumbersSelector
			]
		}

		let descriptor = fontDescriptor.addingAttributes([
			.featureSettings: [monospacedFeature]
		])

		return Self(descriptor: descriptor, size: 0)
	}
}