Add size specifiable preferredFont method

Sources/UIKitPlus/Extensions/UIFont+.swift

@@ -20,6 +20,23 @@ extension UIFont {
             return style.metrics.scaledFont(for: font)
         }
     }
+
+    /// Returns an instance of the system font for the specified `size`(in points) and `weight` with scaling for the user's selected content size category.
+    /// - Parameters:
+    ///   - size: The size (in points) to which the font is scaled. This value must be greater than 0.0.
+    ///   - weight: The weight of the font, specified as a font weight constant. For a list of possible values, see [UIFont.Weight](https://developer.apple.com/documentation/uikit/uifont/weight).
+    ///   - maximumPointSize: The maximum point size allowed for the font. Use this value to constrain the font to the specified size when your interface cannot accommodate text that is any larger.
+    /// - Important: If you set the `size` to less than 13, it will be difficult for users to read.
+    /// - Returns: The system font associated with the specified `size` and `weight`.
+    public static func preferredFont(ofSize size: CGFloat, weight: UIFont.Weight = .regular, maximumPointSize: CGFloat? = nil) -> UIFont {
+        let font: UIFont = .systemFont(ofSize: size, weight: weight)
+
+        if let maximumPointSize = maximumPointSize {
+            return UIFontMetrics.default.scaledFont(for: font, maximumPointSize: maximumPointSize)
+        } else {
+            return UIFontMetrics.default.scaledFont(for: font)
+        }
+    }
 }
 
 #endif

UIKitPlusExample/UIKitPlusExample/ExampleViewControllers/UIFontPreferredFontExample.swift

@@ -19,6 +19,14 @@ final class UIFontPreferredFontExampleViewController: UIViewController {
         return label
     }()
 
+    lazy var sizedPreferredFontLabel: UILabel = {
+        let label = UILabel()
+        label.text = "Lorem ipsum dolor sit amet."
+        label.adjustsFontForContentSizeCategory = true
+        label.font = .preferredFont(ofSize: 20, weight: .ultraLight)
+        return label
+    }()
+
     override func viewDidLoad() {
         super.viewDidLoad()
 
@@ -28,6 +36,8 @@ final class UIFontPreferredFontExampleViewController: UIViewController {
         titleLabel.translatesAutoresizingMaskIntoConstraints = false
         self.view.addSubview(bodyLabel)
         bodyLabel.translatesAutoresizingMaskIntoConstraints = false
+        self.view.addSubview(sizedPreferredFontLabel)
+        sizedPreferredFontLabel.translatesAutoresizingMaskIntoConstraints = false
 
         NSLayoutConstraint.activate([
             titleLabel.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor, constant: 10),
@@ -37,6 +47,10 @@ final class UIFontPreferredFontExampleViewController: UIViewController {
             bodyLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 10),
             bodyLabel.leadingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.leadingAnchor, constant: 10),
             bodyLabel.trailingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.trailingAnchor, constant: -10),
+
+            sizedPreferredFontLabel.topAnchor.constraint(equalTo: bodyLabel.bottomAnchor, constant: 10),
+            sizedPreferredFontLabel.leadingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.leadingAnchor, constant: 10),
+            sizedPreferredFontLabel.trailingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.trailingAnchor, constant: -10),
         ])
     }
 }