Add UIFont

Sources/Silica/UIKit/UIFont.swift

@@ -0,0 +1,74 @@
+//
+//  UIFont.swift
+//  Cacao
+//
+//  Created by Alsey Coleman Miller on 5/31/16.
+//  Copyright © 2016 PureSwift. All rights reserved.
+//
+
+import struct Foundation.CGFloat
+
+public final class UIFont {
+
+    // MARK: - Properties
+
+    public let cgFont: CGFont
+
+    // MARK: Font Name Attributes
+
+    public var fontName: String { return cgFont.name }
+
+    public var familyName: String { return cgFont.family }
+
+    // MARK: Font Metrics
+
+    public let pointSize: CGFloat
+
+    public lazy var descender: CGFloat = (CGFloat(self.cgFont.scaledFont.descent) * self.pointSize) / CGFloat(self.cgFont.scaledFont.unitsPerEm)
+
+    public lazy var ascender: CGFloat = (CGFloat(self.cgFont.scaledFont.ascent) * self.pointSize) / CGFloat(self.cgFont.scaledFont.unitsPerEm)
+
+    // MARK: - Initialization
+
+    public init?(name: String, size: CGFloat) {
+
+        guard let cgFont = CGFont(name: name)
+            else { return nil }
+
+        self.cgFont = cgFont
+        self.pointSize = size
+    }
+}
+
+// MARK: - Extensions
+
+public extension UIFont {
+
+    static func systemFont(ofSize size: CGFloat) -> UIFont {
+        return UIFont(name: "HelveticaNeu", size: size)!
+    }
+
+    static func boldSystemFont(ofSize size: CGFloat) -> UIFont {
+        return UIFont(name: "HelveticaNeu-Bold", size: size)!
+    }
+}
+
+// MARK: - Equatable
+
+extension UIFont: Equatable {
+
+    public static func == (lhs: UIFont, rhs: UIFont) -> Bool {
+        return lhs.fontName == rhs.fontName
+            && lhs.pointSize == rhs.pointSize
+    }
+}
+
+// MARK: - Hashable
+
+extension UIFont: Hashable {
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(fontName)
+        hasher.combine(pointSize)
+    }
+}