如何将自定义字体添加到Cocoapod？

Question

我想在Cocoapod中使用自定义字体,但在静态库中使用自定义字体时找不到任何内容.由于没有info.plist文件,因此无法告诉应用程序使用什么字体.

有任何想法吗？

Answer 1

如果我理解正确,您正在尝试使用Cocoapod提供字体,并且您希望包含该pod的iOS应用程序能够使用您的自定义字体.

这个post_install钩似乎工作:

Pod::Spec.new do |s|
  # ...
  s.resources = "Resources/*.otf"
  # ...
  s.post_install do |library_representation|
    require 'rexml/document'

    library = library_representation.library
    proj_path = library.user_project_path
    proj = Xcodeproj::Project.new(proj_path)
    target = proj.targets.first # good guess for simple projects

    info_plists = target.build_configurations.inject([]) do |memo, item|
      memo << item.build_settings['INFOPLIST_FILE']
    end.uniq
    info_plists = info_plists.map { |plist| File.join(File.dirname(proj_path), plist) }

    resources = library.file_accessors.collect(&:resources).flatten
    fonts = resources.find_all { |file| File.extname(file) == '.otf' || File.extname(file) == '.ttf' }
    fonts = fonts.map { |f| File.basename(f) }

    info_plists.each do |plist|
      doc = REXML::Document.new(File.open(plist))
      main_dict = doc.elements["plist"].elements["dict"]
      app_fonts = main_dict.get_elements("key[text()='UIAppFonts']").first
      if app_fonts.nil?
        elem = REXML::Element.new 'key'
        elem.text = 'UIAppFonts'
        main_dict.add_element(elem)
        font_array = REXML::Element.new 'array'
        main_dict.add_element(font_array)
      else
        font_array = app_fonts.next_element
      end

      fonts.each do |font|
        if font_array.get_elements("string[text()='#{font}']").empty?
          font_elem = REXML::Element.new 'string'
          font_elem.text = font
          font_array.add_element(font_elem)
        end
      end

      doc.write(File.open(plist, 'wb'))
    end
  end

钩子找到用户项目,并且在第一个目标中(你可能通过要求CocoaPods给你真正的目标来完成这个解决方案)它查找它的Info.plist文件(通常只有一个).最后,它查找UIAppFonts文件的密钥,如果找不到则创建它,并在数组中填入字体名称(如果它们不存在).

Answer 2

有一种使用自定义字体而不将任何内容添加到plist文件的方法。

    NSBundle *bundle = [NSBundle bundleForClass:[self class]];
    NSURL *fontURL = [bundle URLForResource:<#fontName#> withExtension:@"otf"/*or TTF*/];
    NSData *inData = [NSData dataWithContentsOfURL:fontURL];
    CFErrorRef error;
    CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
    CGFontRef font = CGFontCreateWithDataProvider(provider);
    if (!CTFontManagerRegisterGraphicsFont(font, &error)) {
        CFStringRef errorDescription = CFErrorCopyDescription(error);
        NSLog(@"Failed to load font: %@", errorDescription);
        CFRelease(errorDescription);
    }
    CFSafeRelease(font);
    CFSafeRelease(provider);

您还需要此CFSafeRelease功能才能正常工作。

void CFSafeRelease(CFTypeRef cf) {
    if (cf != NULL) {
        CFRelease(cf);
    }
}

来源：动态加载iOS字体。

等效的Swift：

extension UIFont {
    static func registerFont(bundle: Bundle, fontName: String, fontExtension: String) -> Bool {
        guard let fontURL = bundle.url(forResource: fontName, withExtension: fontExtension) else {
            fatalError("Couldn't find font \(fontName)")
        }

        guard let fontDataProvider = CGDataProvider(url: fontURL as CFURL) else {
            fatalError("Couldn't load data from the font \(fontName)")
        }

        guard let font = CGFont(fontDataProvider) else {
            fatalError("Couldn't create font from data")
        }

        var error: Unmanaged<CFError>?
        let success = CTFontManagerRegisterGraphicsFont(font, &error)
        guard success else {
            print("Error registering font: maybe it was already registered.")
            return false
        }

        return true
    }
}

Answer 3

对于那些在2018年以上发现这一点的人,我通过以下两个步骤获得了自定义字体以使用界面构建器支持(XCode 9):

1. 将字体添加到资源包中

   s.resource_bundles = {
     'PodName' => ['PodName/**/*.{ttf}']
   }
   

2. 使用上面的Adam答案在运行时加载字体

   #import <CoreText/CoreText.h>
   
   void CFSafeRelease(CFTypeRef cf) { // redefine this
     if (cf != NULL) {
       CFRelease(cf);
     }
   }
   
   
   + (void) loadFonts {
     NSBundle *frameworkBundle = [NSBundle bundleForClass:self.classForCoder];
     NSURL *bundleURL = [[frameworkBundle resourceURL] URLByAppendingPathComponent:@"PodName.bundle"];
     NSBundle *bundle = [NSBundle bundleWithURL:bundleURL];
   
     NSURL *fontURL = [bundle URLForResource:@"HindMadurai-SemiBold" withExtension:@"ttf"];
     NSData *inData = [NSData dataWithContentsOfURL:fontURL];
     CFErrorRef error;
     CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
     CGFontRef font = CGFontCreateWithDataProvider(provider);
     if (!CTFontManagerRegisterGraphicsFont(font, &error)) {
         CFStringRef errorDescription = CFErrorCopyDescription(error);
         NSLog(@"Failed to load font: %@", errorDescription);
         CFRelease(errorDescription);
     }
     CFSafeRelease(font);
     CFSafeRelease(provider);
   }
   

Answer 4

斯威夫特 5 实施

我能够通过在我的 Cocoapod 中创建以下类来解决这个问题，然后只需CustomFonts.loadAll()从我的主应用程序的AppDelegate.swift. 之后我可以在我的应用程序中使用这样的字体：

let myFont = CustomFonts.Style.regular.font

请注意，Style枚举不是必需的，它只是一种分离关注点的便捷方法。您也可以直接致电：

let myFont = UIFont(name: "SourceSansPro-SemiBold", size: 14)

import CoreText

public class CustomFonts: NSObject {

  public enum Style: CaseIterable {
    case mono
    case regular
    case semibold
    public var value: String {
      switch self {
      case .mono: return "SourceCodePro-Medium"
      case .regular: return "SourceSansPro-Regular"
      case .semibold: return "SourceSansPro-SemiBold"
      }
    }
    public var font: UIFont {
      return UIFont(name: self.value, size: 14) ?? UIFont.init()
    }
  }

  // Lazy var instead of method so it's only ever called once per app session.
  public static var loadFonts: () -> Void = {
    let fontNames = Style.allCases.map { $0.value }
    for fontName in fontNames {
      loadFont(withName: fontName)
    }
    return {}
  }()

  private static func loadFont(withName fontName: String) {
    guard
      let bundleURL = Bundle(for: self).url(forResource: "[CococpodName]", withExtension: "bundle"),
      let bundle = Bundle(url: bundleURL),
      let fontURL = bundle.url(forResource: fontName, withExtension: "ttf"),
      let fontData = try? Data(contentsOf: fontURL) as CFData,
      let provider = CGDataProvider(data: fontData),
      let font = CGFont(provider) else {
        return
    }
    CTFontManagerRegisterGraphicsFont(font, nil)
  }

}