Private "NSCTFontUIUsageAttribute" overwrites public "NSFontFamilyAttribute" attribute 🙃😌 if both set.

titleFontDescriptor.swift

// https://twitter.com/krzyzanowskim/status/1142800558480351232
// Private "NSCTFontUIUsageAttribute" overwrites public "NSFontFamilyAttribute" attribute 🙃😌 if both set.

extension UIFontDescriptor.AttributeName {
  static let fontUIUsageAttribute =  UIFontDescriptor.AttributeName.init(rawValue: "NSCTFontUIUsageAttribute")
}

extension UIFontDescriptor {
  class func preferredFontDescriptor(withTextStyle style: UIFont.TextStyle, family: String) -> UIFontDescriptor {
    let preferredFontDescriptor = UIFontDescriptor.preferredFontDescriptor(withTextStyle: style).withFamily(family)
    let finalAttributes = preferredFontDescriptor.fontAttributes.filter({ $0.key != .fontUIUsageAttribute })
    return UIFontDescriptor(fontAttributes: finalAttributes)
  }
}