Use font provider class to provide default fonts

Instead of having random places where we obtain/configure fonts, this
commits creates a central class where fonts can be retrieved.

Author: SergioEstevao

Aztec.xcodeproj/project.pbxproj

@@ -235,6 +235,7 @@
 		FF61909E202481F4004BCD0A /* CodeFormatter.swift in Sources */ = {isa = PBXBuildFile; fileRef = FF61909D202481F4004BCD0A /* CodeFormatter.swift */; };
 		FF7A1C511E5651EA00C4C7C8 /* LineAttachment.swift in Sources */ = {isa = PBXBuildFile; fileRef = FF7A1C501E5651EA00C4C7C8 /* LineAttachment.swift */; };
 		FF7C89B01E3BC52F000472A8 /* NSAttributedString+FontTraits.swift in Sources */ = {isa = PBXBuildFile; fileRef = FF7C89AF1E3BC52F000472A8 /* NSAttributedString+FontTraits.swift */; };
+		FF7EAEC4234D253B007A26E0 /* FontProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = FF7EAEC3234D253B007A26E0 /* FontProvider.swift */; };
 		FFA61E891DF18F3D00B71BF6 /* ParagraphStyle.swift in Sources */ = {isa = PBXBuildFile; fileRef = FFA61E881DF18F3D00B71BF6 /* ParagraphStyle.swift */; };
 		FFA61EC21DF6C1C900B71BF6 /* NSAttributedString+Archive.swift in Sources */ = {isa = PBXBuildFile; fileRef = FFA61EC11DF6C1C900B71BF6 /* NSAttributedString+Archive.swift */; };
 		FFB5D29720BEB21A0038DCFB /* CiteFormatter.swift in Sources */ = {isa = PBXBuildFile; fileRef = FFB5D29620BEB21A0038DCFB /* CiteFormatter.swift */; };
@@ -513,6 +514,7 @@
 		FF7A1C4A1E51F05700C4C7C8 /* CONTRIBUTING.md */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = net.daringfireball.markdown; path = CONTRIBUTING.md; sourceTree = "<group>"; };
 		FF7A1C501E5651EA00C4C7C8 /* LineAttachment.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LineAttachment.swift; sourceTree = "<group>"; };
 		FF7C89AF1E3BC52F000472A8 /* NSAttributedString+FontTraits.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSAttributedString+FontTraits.swift"; sourceTree = "<group>"; };
+		FF7EAEC3234D253B007A26E0 /* FontProvider.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FontProvider.swift; sourceTree = "<group>"; };
 		FFA61E881DF18F3D00B71BF6 /* ParagraphStyle.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ParagraphStyle.swift; sourceTree = "<group>"; };
 		FFA61EC11DF6C1C900B71BF6 /* NSAttributedString+Archive.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSAttributedString+Archive.swift"; sourceTree = "<group>"; };
 		FFB5D29620BEB21A0038DCFB /* CiteFormatter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CiteFormatter.swift; sourceTree = "<group>"; };
@@ -804,6 +806,7 @@
 				FFA61E881DF18F3D00B71BF6 /* ParagraphStyle.swift */,
 				B5A99D831EBA073D00DED081 /* HTMLStorage.swift */,
 				F9982CF521877663001E606B /* TextViewPasteboardDelegate.swift */,
+				FF7EAEC3234D253B007A26E0 /* FontProvider.swift */,
 			);
 			path = TextKit;
 			sourceTree = "<group>";
@@ -1573,6 +1576,7 @@
 				F165D92A20C72EF500EAA6B0 /* Array+ShortcodeAttribute.swift in Sources */,
 				F165D92420C72C1000EAA6B0 /* ShortcodeAttributeSerializer.swift in Sources */,
 				F177FF751FB6404D00CBBE35 /* UILayoutPriority+Swift4.swift in Sources */,
+				FF7EAEC4234D253B007A26E0 /* FontProvider.swift in Sources */,
 				F1C05B9D1E37FA77007510EA /* String+CharacterName.swift in Sources */,
 				F1FF7D9F201A1D24007B0B32 /* Figcaption.swift in Sources */,
 				FF17B2D2227A589F0022AECE /* LIElementConverter.swift in Sources */,

Aztec/Classes/Formatters/Implementations/CodeFormatter.swift

@@ -12,15 +12,8 @@ class CodeFormatter: AttributeFormatter {
 
     // MARK: - Init
 
-    init(monospaceFont: UIFont = UIFont(descriptor:UIFontDescriptor(name: "Courier", size: 12), size:12), backgroundColor: UIColor = UIColor.lightGray) {
-        let font: UIFont
-
-        if #available(iOS 11.0, *) {
-            font = UIFontMetrics.default.scaledFont(for: monospaceFont)
-        } else {
-            font = monospaceFont
-        }
-        self.monospaceFont = font
+    init(monospaceFont: UIFont = FontProvider.shared.monospaceFont, backgroundColor: UIColor = UIColor.lightGray) {
+        self.monospaceFont = monospaceFont
         self.backgroundColor = backgroundColor
         self.htmlRepresentationKey = .codeHtmlRepresentation
     }

Aztec/Classes/Formatters/Implementations/PreFormatter.swift

@@ -14,19 +14,10 @@ open class PreFormatter: ParagraphAttributeFormatter {
     ///
     let placeholderAttributes: [NSAttributedString.Key: Any]?
 
-
     /// Designated Initializer
     ///
-    init(monospaceFont: UIFont = UIFont(descriptor:UIFontDescriptor(name: "Courier", size: 12), size:12), placeholderAttributes: [NSAttributedString.Key : Any]? = nil) {
-        let font: UIFont
-
-        if #available(iOS 11.0, *) {
-            font = UIFontMetrics.default.scaledFont(for: monospaceFont)
-        } else {
-            font = monospaceFont
-        }
-
-        self.monospaceFont = font
+    init(monospaceFont: UIFont = FontProvider.shared.monospaceFont, placeholderAttributes: [NSAttributedString.Key : Any]? = nil) {
+        self.monospaceFont = monospaceFont
         self.placeholderAttributes = placeholderAttributes
     }
 

Aztec/Classes/TextKit/FontProvider.swift

@@ -0,0 +1,33 @@
+import Foundation
+import UIKit
+
+public class FontProvider {
+
+    private init() {
+
+    }
+
+    static var shared = FontProvider()
+
+    lazy var monospaceFont: UIFont = {
+        let baseFont = UIFont(descriptor:UIFontDescriptor(name: "Menlo", size: 14), size:14)
+        let font: UIFont
+        if #available(iOS 11.0, *) {
+            font = UIFontMetrics.default.scaledFont(for: baseFont)
+        } else {
+            font = baseFont
+        }
+        return font
+    }()
+
+    lazy var defaultFont: UIFont = {
+        let baseFont = UIFont.systemFont(ofSize: 14)
+        let font: UIFont
+        if #available(iOS 11.0, *) {
+            font = UIFontMetrics.default.scaledFont(for: baseFont)
+        } else {
+            font = baseFont
+        }
+        return font
+    }()
+}

Aztec/Classes/TextKit/TextView.swift

@@ -397,13 +397,7 @@ open class TextView: UITextView {
     }
 
     required public init?(coder aDecoder: NSCoder) {
-        let font = UIFont.systemFont(ofSize: 14)
-        if #available(iOS 11.0, *) {
-            self.defaultFont = UIFontMetrics.default.scaledFont(for: font)
-        } else {
-            self.defaultFont = font
-        }
-
+        self.defaultFont = FontProvider.shared.defaultFont
         defaultParagraphStyle = ParagraphStyle.default
         defaultMissingImage = Assets.imageIcon