Practical Dynamic Type: Attributed Strings, Snippet 2

dynamictype3-snippet2.swift

// ...
label.adjustsFontForContentSizeCategory = true

NotificationCenter.default.addObserver(self,
                                       selector: #selector (uiContentSizeCategoryChanged),
                                       name: .FontMetricsContentSizeCategoryDidChange,
                                       object: nil)
// ...
// ...

// MARK: Event Handlers

/// Update the sizes of all contained fonts whenever the Dynamic Type size changes.
@objc func uiContentSizeCategoryChanged() {
  /// Handle contentSizeCategoryDidChange, here.
}

// ...