Practical Dynamic Type, Part 3: Attributed Strings

dynamictype3-snippet4.swift

/// `FontSetterAttributeKey` is used to keep track of the custom Font assigned to a range within
/// an `AttributedString`.
static let FontSetterAttributeKey = NSAttributedString.Key.init("FontSetterAttributeKey")

/// A `UILabel` that will render the attributed string with Dynamic Type.
lazy var display: UILabel = {
  let fontSetter1: FontSetter = { UIFont.customFont(weight: .bold, points: 18.0) }

  let string1 = NSAttributedString(
    string: "Jived fox nymph grabs quick waltz. ",
    attributes: [AttributedStringView.FontSetterAttributeKey : fontSetter1, /// <= Attaching the FontSetter for this string
                 .font: fontSetter1()
    ]
  )


  let fontSetter2: FontSetter = { UIFont.customFont(weight: .light, points: 8.0) }
  let string2 = NSAttributedString(
    string: "Glib jocks quiz nymph to vex dwarf. ",
    attributes: [AttributedStringView.FontSetterAttributeKey : fontSetter2, /// <= Attaching the FontSetter for this string
                 .font: fontSetter2()
    ]
  )

  let fontSetter3: FontSetter = { UIFont.customFont(NeutrafaceSlabTextFont.self,
                                                    weight: .demi,
                                                    points: 18.0,
                                                    maximumPointSize: 24.0) }
  let string3 = NSAttributedString(
    string: "Sphinx of black quartz, judge my vow. ",
    attributes: [AttributedStringView.FontSetterAttributeKey : fontSetter3, /// <= Attaching the FontSetter for this string
                 .font: fontSetter3()
    ]
  )

  let fontSetter4: FontSetter = { UIFont.customFont(weight: .heavy,
                                                    points: 48.0) }
  let string4 = NSAttributedString(
    string: "How vexingly quick daft zebras jump!",
    attributes: [AttributedStringView.FontSetterAttributeKey : fontSetter4, /// <= Attaching the FontSetter for this string
                 .font: fontSetter4()
    ]
  )
  
  /// ...
  
}()