Font optionality support

README.md

@@ -97,6 +97,8 @@ Color(nsuiColor: NSUIColor)
 Image(nsuiImage: NSUIImage)
 
 // AppKit/UIKit
+NSUIFont.init(nsuiDescriptor:, size:)
+NSUIFontDescriptor.nsuiWithSymbolicTraits(_:)
 NSUITextView.nsuiLayoutManager
 ```
 

Sources/NSUI/Font.swift

@@ -0,0 +1,30 @@
+#if canImport(AppKit) && !targetEnvironment(macCatalyst)
+import AppKit
+
+extension NSUIFontDescriptor.SymbolicTraits {
+	public static let traitItalic = Self.italic
+	public static let traitBold = Self.bold
+	public static let traitExpanded = Self.expanded
+	public static let traitCondensed = Self.condensed
+	public static let traitMonoSpace = Self.monoSpace
+}
+
+#endif
+
+extension NSUIFontDescriptor {
+	/// NSUI wrapper around `withSymbolicTraits`.
+	///
+	/// This can return a nil value on iOS/visionOS.
+	public func nsuiWithSymbolicTraits(_ symbolicTraits: NSUIFontDescriptor.SymbolicTraits) -> NSUIFontDescriptor? {
+		withSymbolicTraits(symbolicTraits)
+	}
+}
+
+extension NSUIFont {
+	/// NSUI wrapper around `init`.
+	///
+	/// This initializer can fail on macOS.
+	public convenience init?(nsuiDescriptor: NSUIFontDescriptor, size: CGFloat) {
+		self.init(descriptor: nsuiDescriptor, size: size)
+	}
+}