02.使用TTF字体

在项目的 Info.plist 中添加 Fonts provided by application 在其中填入字体文件名

• 可以通过下面的方式通过 fontName 设置 font

let familyNames = UIFont.familyNames
        for familyName in familyNames {
            print("++++++ " + familyName + " ++++++")
            let fontNames = UIFont.fontNames(forFamilyName: familyName)
            for fontName in fontNames {
                print(fontName)
            }
            print("=================================")
        }

        return UIFont(name: "hahahahahaah", size: fontSize)!