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layout: hexo
title: CTFont.h学习
date: 2017-03-02 14:05:56
tags:[CTFont,ios]

富文本离不开文字，下面我们学下字体Font

字体内容较多，我们从以下方面学下。

1.Font Types

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CFTypeID CTFontGetTypeID( void )  获取font  CFTypeID

2.Font Constants

kCTFontCopyrightNameKey 版权key
kCTFontFamilyNameKey family（家族） key
kCTFontSubFamilyNameKey subfamily（子家族）key
kCTFontStyleNameKey 字体style key
kCTFontUniqueNameKey 独一无二key（value不是真的独一无二，不应该假设唯一）
kCTFontFullNameKey 字体全名key
kCTFontVersionNameKey 字体版本号key
kCTFontPostScriptNameKey 字体补充说明key
kCTFontTrademarkNameKey 商标key
kCTFontManufacturerNameKey 制造商key
kCTFontDesignerNameKey 设计者key
kCTFontDescriptionNameKey 字体描述key
kCTFontVendorURLNameKey 供应商url key
kCTFontLicenseNameKey 许可证key
kCTFontLicenseURLNameKey 许可证url key
kCTFontSampleTextNameKey 简单text key
kCTFontPostScriptCIDNameKey 补充说明CID key

这些key 暂时不知道干嘛用的。

3.Font Creation

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CTFontRef CTFontCreateWithName(
    CFStringRef __nullable      name,
    CGFloat                     size,
    const CGAffineTransform * __nullable matrix )
   
 name 必须是postScript 字符串    
  
 代码
 -(void)createAllPostScript{
    NSArray * postScriptArr = (__bridge  NSArray *)  CTFontManagerCopyAvailablePostScriptNames();
    UIScrollView * view = [[UIScrollView alloc]initWithFrame:self.bounds];
    view.contentSize = CGSizeMake(self.bounds.size.width, 30*postScriptArr.count);
    [self addSubview:view];
    [postScriptArr enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        NSString * strName = obj;
        UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, idx*30, self.bounds.size.width, 30)];
 
        UIFont * font = (__bridge UIFont *)CTFontCreateWithName((__bridge CFStringRef)strName, 20, NULL);
       strName =(__bridge NSString *) CTFontCopyPostScriptName((__bridge CTFontRef)font);
        
        label.font = font;
        label.text = strName;
        [view addSubview:label];
        
    }];
        
}

结果：

image

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CTFontRef CTFontCreateWithFontDescriptor(
    CTFontDescriptorRef     descriptor,
    CGFloat                 size,
    const CGAffineTransform * __nullable matrix )
    根据descriptor 创建字体      size 设置0.0 默认是12.0  
    
    代码
    - (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self createAllPostScript];
    }
    return self;
}
-(void)createAllPostScript{
    NSArray * postScriptArr = (__bridge  NSArray *)  CTFontManagerCopyAvailablePostScriptNames();
    UIScrollView * view = [[UIScrollView alloc]initWithFrame:self.bounds];
    view.contentSize = CGSizeMake(self.bounds.size.width, 30*postScriptArr.count);
    [self addSubview:view];
    [postScriptArr enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        NSString * strName = obj;
        UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, idx*30, self.bounds.size.width, 30)];
 
        CTFontDescriptorRef des = CTFontDescriptorCreateWithNameAndSize((__bridge CFStringRef)strName, 20);
        UIFont * font = (__bridge UIFont *)CTFontCreateWithFontDescriptor(des, 10, NULL);
       strName =(__bridge NSString *) CTFontCopyPostScriptName((__bridge CTFontRef)font);
        
        label.font = font;
        label.text = strName;
        [view addSubview:label];
        
    }];
}

效果：

image

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CTFontRef CTFontCreateWithNameAndOptions(
    CFStringRef                 name,
    CGFloat                     size,
    const CGAffineTransform * __nullable matrix,
    CTFontOptions               options )
    
    主要是CTFontOptions  没发现有啥区别。  
    同CTFontRef CTFontCreateWithName(
    CFStringRef __nullable      name,
    CGFloat                     size,
    const CGAffineTransform * __nullable matrix )函数效果一样
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CTFontRef CTFontCreateWithFontDescriptorAndOptions(
    CTFontDescriptorRef     descriptor,
    CGFloat                 size,
    const CGAffineTransform * __nullable matrix,
    CTFontOptions           options )
    
   效果同
   CTFontRef CTFontCreateWithFontDescriptor(
    CTFontDescriptorRef     descriptor,
    CGFloat                 size,
    const CGAffineTransform * __nullable matrix )
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CTFontRef __nullable CTFontCreateUIFontForLanguage(
    CTFontUIFontType    uiType,
    CGFloat             size,
    CFStringRef __nullable language )
    该函数不会使用  language 不知道怎么来的
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CTFontRef CTFontCreateCopyWithAttributes(
    CTFontRef                   font,
    CGFloat                     size,
    const CGAffineTransform * __nullable matrix,
    CTFontDescriptorRef __nullable attributes ) 
   根据font 和 attributes 创建一个新的font   CTFontDescriptorRef 属性不知道咋用
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CTFontRef __nullable CTFontCreateCopyWithSymbolicTraits(
    CTFontRef                   font,
    CGFloat                     size,
    const CGAffineTransform * __nullable matrix,
    CTFontSymbolicTraits        symTraitValue,
    CTFontSymbolicTraits        symTraitMask )
    暂时不研究
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CTFontRef __nullable CTFontCreateCopyWithFamily(
    CTFontRef                   font,
    CGFloat                     size,
    const CGAffineTransform * __nullable matrix,
    CFStringRef                 family )
    暂时不研究

4.Font Cascading

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CTFontRef CTFontCreateForString(
    CTFontRef       currentFont,
    CFStringRef     string,
    CFRange         range ) CT_AVAILABLE(10_5, 3_2);

5.Font Accessors

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CTFontDescriptorRef CTFontCopyFontDescriptor(
    CTFontRef       font )
    获取font 的 descriptorref
    
    -(void)font{
    UIFont * font = [UIFont systemFontOfSize:24];
    CTFontDescriptorRef ref = CTFontCopyFontDescriptor((__bridge CTFontRef) font );
    CFDictionaryRef attdic = CTFontDescriptorCopyAttributes(ref);
    NSLog(@"descriptorref %@",attdic);
}
    结果：
    2017-03-01 16:09:30.336 CoreTextDemo[43313:1154770] descriptorref {
    NSCTFontUIUsageAttribute = CTFontRegularUsage;
    NSFontSizeAttribute = 24;
}
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CFTypeRef __nullable CTFontCopyAttribute(
    CTFontRef       font,
    CFStringRef     attribute )
    这个请求font  的 attribute 属性。 暂时 不清楚font到底有啥属性。
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CGFloat CTFontGetSize( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取字体的大小
UIFont * font = [UIFont systemFontOfSize:24];
    CGFloat fontSize = CTFontGetSize( (__bridge CTFontRef) font );
    NSLog(@"font size %lf",fontSize);
    结果：
    2017-03-01 16:14:29.446 CoreTextDemo[43346:1159004] font size 24.000000
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CGAffineTransform CTFontGetMatrix( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取 transform 
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    CGAffineTransform transform = CTFontGetMatrix(  font );
    NSLog(@"font transform %@",NSStringFromCGAffineTransform(transform));
    结果：
2017-03-01 16:16:31.407 CoreTextDemo[43362:1161110] font transform [1, 0, 0, 1, 0, 0]
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CTFontSymbolicTraits CTFontGetSymbolicTraits( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取  CTFontSymbolicTraits；
代码：
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    CTFontSymbolicTraits symolictraits = CTFontGetSymbolicTraits(font);
    NSLog(@"font SymbolicTraits %u" , symolictraits);
    
结果：
2017-03-01 16:19:06.667 CoreTextDemo[43380:1163730] font SymbolicTraits 0
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CFDictionaryRef CTFontCopyTraits( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取一个Traits 字典
代码：
	 CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
   NSDictionary * traitsDic =(__bridge NSDictionary *) CTFontCopyTraits(font);
    NSLog(@"font traits dic %@",traitsDic);
结果：
	2017-03-01 16:22:06.911 CoreTextDemo[43403:1166912] font traits dic {
    NSCTFontSlantTrait = 0;
    NSCTFontSymbolicTrait = 16384;
    NSCTFontUIFontDesignTrait = NSCTFontUIFontDesignDefault;

6.Font Names

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   CFStringRef CTFontCopyPostScriptName( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取postScriptName
 代码：
   
   CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    NSString * postScriptName =(__bridge NSString *) CTFontCopyPostScriptName( font ) ;
    NSLog(@"font name postScript %@",postScriptName);
    
结果：
	2017-03-01 16:27:09.535 CoreTextDemo[43424:1171595] font name postScript .SFUIDisplay
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CFStringRef CTFontCopyFamilyName( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取familyName 
代码：
	    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    NSString * familyName =(__bridge NSString *) CTFontCopyFamilyName(  font );
    NSLog(@"font name familyName %@",familyName);
结果：
	2017-03-01 16:31:58.418 CoreTextDemo[43456:1176085] font name familyName .SF UI Display
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CFStringRef CTFontCopyFullName( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
 获取full的名字
 代码：
 	    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    NSString * fullName =(__bridge NSString *) CTFontCopyFullName(  font );
    NSLog(@"font name fullName %@",fullName);
 
 结果：
 	2017-03-01 16:34:50.587 CoreTextDemo[43474:1179511] font name fullName System Font Regular
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CFStringRef CTFontCopyDisplayName( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取displayName
代码：
    NSString * displayName =(__bridge NSString *) CTFontCopyDisplayName(  font );
    NSLog(@"font name displayName %@",displayName);
结果：
	2017-03-01 16:37:05.363 CoreTextDemo[43491:1182119] font name displayName System Font
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CFStringRef __nullable CTFontCopyName(
    CTFontRef       font,
    CFStringRef     nameKey ) CT_AVAILABLE(10_5, 3_2);
    没看懂干嘛的
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CFStringRef __nullable CTFontCopyLocalizedName(
    CTFontRef       font,
    CFStringRef     nameKey,
    CFStringRef __nullable * __nullable actualLanguage ) CT_AVAILABLE(10_5, 3_2);
没看懂干嘛的

7.Font Encoding

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CFCharacterSetRef CTFontCopyCharacterSet( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取一个CFCharcerSetRef
代码：
   CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    CFCharacterSetRef ref = CTFontCopyCharacterSet( font ) ;
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CFStringEncoding CTFontGetStringEncoding( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取编码
代码：
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    CFStringEncoding encoding = CTFontGetStringEncoding(font);
    NSLog(@"font encoding %u",(unsigned int)encoding);
结果：
	2017-03-01 16:56:38.895 CoreTextDemo[43667:1198531] font encoding 0
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CFArrayRef CTFontCopySupportedLanguages( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取字体支持的语言
代码：
	CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    NSArray * supportLanguages = (__bridge NSArray *)  CTFontCopySupportedLanguages(  font ) ;
    NSLog(@"font support languages %@",supportLanguages);
结果：
	 font support languages (
    wae,
    hsb,
    yo,
    rof,
    af,
    dav,
    be,
    zu,
    ca,
    bg,
    ce,
    da,
    jmc,
    de,
    ksb,
    br,
    bs,
    mer,
    cs,
    ga,
    gsw,
    kde,
    el,
    gd,
    fi,
    en,
    ksh,
    eo,
    cy,
    es,
    fo,
    et,
    eu,
    gl,
    id,
    fr,
    ig,
    kam,
    fil,
    vun,
    fy,
    xog,
    gv,
    hr,
    mgh,
    rwk,
    lb,
    hu,
    fur,
    ki,
    seh,
    is,
    kk,
    it,
    bem,
    nb,
    mg,
    nd,
    mk,
    nyn,
    asa,
    kw,
    mn,
    sbp,
    lt,
    ky,
    nl,
    lv,
    nn,
    ms,
    mt,
    teo,
    guz,
    om,
    pl,
    bez,
    os,
    kln,
    mfe,
    pt,
    sg,
    rm,
    rn,
    ro,
    sk,
    dsb,
    tg,
    qu,
    sl,
    luo,
    ebu,
    sn,
    cgg,
    so,
    sah,
    tk,
    ru,
    sq,
    sr,
    rw,
    ast,
    uk,
    sv,
    tr,
    vi,
    sw,
    kea,
    luy,
    saq
)
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bool CTFontGetGlyphsForCharacters(
    CTFontRef       font,
    const UniChar   characters[],
    CGGlyph         glyphs[],
    CFIndex         count ) CT_AVAILABLE(10_5, 3_2);
用来判断是字符编码是否是fong中的
代码：
- (BOOL)isCharacter:(unichar*)characters supportedByFont:(UIFont *)aFont length:(NSInteger)length
{
    CGGlyph glyphs[length] ;
    CTFontRef ctFont = CTFontCreateWithName((CFStringRef)aFont.fontName, aFont.pointSize, NULL);
    BOOL ret = CTFontGetGlyphsForCharacters(ctFont, characters, glyphs, length);
    CFRelease(ctFont);
    return ret;
}
-(void)font{
CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    NSString *characters = @"a";
   unichar * chars = (unichar*)[characters cStringUsingEncoding:NSUTF8StringEncoding];
    bool isSuccess=[self isCharacter:chars supportedByFont:[UIFont systemFontOfSize:24] length:characters.length];
    if (isSuccess) {
        NSLog(@"characters success");
    }else{
        NSLog(@"characters failure");
    }
   }
    
    
  结果：
  2017-03-01 17:15:34.008 CoreTextDemo[43765:1215312] characters success
  
  
  要是为 characters = @"🐯" ； 结果就是 characters failure
  目前实验只是针对一个字符好使，多个不好使。 中文字也不行。具体用法还要再探究。

8.Font Metrics

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CGFloat CTFontGetAscent( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取 ascent
CGFloat CTFontGetDescent( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取descent
CGFloat CTFontGetLeading( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取leading
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unsigned CTFontGetUnitsPerEm( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
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CFIndex CTFontGetGlyphCount( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取字体总个数。
   CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    CFIndex index =  CTFontGetGlyphCount(font);
    NSLog(@"font glyph count %ld",index);
结果：
	2017-03-01 17:45:17.390 CoreTextDemo[44046:1239054] font glyph count 2325
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CGRect CTFontGetBoundingBox( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取font 设计大小
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    CGRect fontRect = CTFontGetBoundingBox(  font );
    NSLog(@"font rect %@",NSStringFromCGRect(fontRect));
    
结果：2017-03-01 17:47:19.898 CoreTextDemo[44063:1241783] font rect {{-6.38671875, -6.5390625}, {36.43359375, 32.49609375}}
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CGFloat CTFontGetUnderlinePosition( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取下划线位置
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    CGFloat UnderlinePosition = CTFontGetUnderlinePosition(  font );
    NSLog(@"font UnderlinePosition %lf",UnderlinePosition);
    
结果：
2017-03-01 19:22:12.226 CoreTextDemo[47842:1272227] font UnderlinePosition -3.632812
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CGFloat CTFontGetUnderlineThickness( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取下划线厚度
代码：
  CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    CGFloat UnderlineThickness = CTFontGetUnderlineThickness(font);
    NSLog(@"font UnderlineThickness %lf",UnderlineThickness);
    
结果
2017-03-01 19:24:51.013 CoreTextDemo[47865:1275126] font UnderlineThickness 1.406250
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CGFloat CTFontGetSlantAngle( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取字体的倾斜角度
代码：
	   CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
   CGFloat slantAngle =  CTFontGetSlantAngle(font);
    NSLog(@"font slantAngle %lf",slantAngle);
结果：
2017-03-01 19:27:27.999 CoreTextDemo[47890:1278289] font slantAngle 0.000000
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CGFloat CTFontGetCapHeight( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取cap 高度
代码：
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    CGFloat capHeight =   CTFontGetCapHeight(font);
    NSLog(@"font capHeight %lf",capHeight);
    
结果：
2017-03-01 19:30:31.542 CoreTextDemo[49032:1283158] font capHeight 16.910156
我感觉像是大写字母的高度
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CGFloat CTFontGetXHeight( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
获取XHeight 高度  
小写字母的高度
代码：
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    CGFloat xHeight = CTFontGetXHeight(font);
    NSLog(@"font xHeight %lf",xHeight );
    
结果：
2017-03-01 19:39:33.683 CoreTextDemo[49097:1293600] font xHeight 12.632812

9.Font Glyphs

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CGGlyph CTFontGetGlyphWithName(
    CTFontRef           font,
    CFStringRef         glyphName ) CT_AVAILABLE(10_5, 3_2);
  获取一个字形
  代码
      CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    NSString * str = @"a";
   CGGlyph glyph =  CTFontGetGlyphWithName(font,(__bridge CFStringRef)str);
    NSLog(@"font glyph 查询字符的 cgglyph %d",glyph);
 
 结果：
 enable_private_data: 0
2017-03-01 19:48:52.196 CoreTextDemo[49149:1302956] font glyph 查询字符的 cgglyph 0
该函数不会用
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CGRect CTFontGetBoundingRectsForGlyphs(
    CTFontRef           font,
    CTFontOrientation   orientation,
    const CGGlyph       glyphs[],
    CGRect * __nullable boundingRects,
    CFIndex             count ) CT_AVAILABLE(10_5, 3_2);
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CGRect CTFontGetOpticalBoundsForGlyphs(
    CTFontRef           font,
    const CGGlyph       glyphs[],
    CGRect * __nullable boundingRects,
    CFIndex             count,
    CFOptionFlags       options ) CT_AVAILABLE(10_8, 6_0)
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double CTFontGetAdvancesForGlyphs(
    CTFontRef           font,
    CTFontOrientation   orientation,
    const CGGlyph       glyphs[],
    CGSize * __nullable advances,
    CFIndex             count ) CT_AVAILABLE(10_5, 3_2);
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void CTFontGetVerticalTranslationsForGlyphs(
    CTFontRef       font,
    const CGGlyph   glyphs[],
    CGSize          translations[],
    CFIndex         count ) CT_AVAILABLE(10_5, 3_2);
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CGPathRef __nullable CTFontCreatePathForGlyph(
    CTFontRef                   font,
    CGGlyph                     glyph,
    const CGAffineTransform * __nullable matrix ) CT_AVAILABLE(10_5, 3_2);
    
    暂时不做研究

10.Font Variations

key value 解释
kCTFontVariationAxisIdentifierKey CFNumberRef axis identifier
kCTFontVariationAxisMinimumValueKey CFNumberRef minimum axis
kCTFontVariationAxisMaximumValueKey CFNumberRef maximum axis
kCTFontVariationAxisDefaultValueKey CFNumberRef default axis
kCTFontVariationAxisNameKey CFNumberRef the localized variation axis name. 
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CFArrayRef __nullable CTFontCopyVariationAxes( CTFontRef font ) CT_AVAILABLE(10_5, 3_2)
具体干嘛用的不知道
代码：
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    NSArray * axisArr =(__bridge NSArray *) CTFontCopyVariationAxes(font);
    NSLog(@"font axis Arr %@",axisArr);
结果：
2017-03-02 10:26:35.298 CoreTextDemo[50287:1355486] font axis Arr (
    	{
	NSCTVariationAxisMaximumValue = 1.9989,
	NSCTVariationAxisMinimumValue = 0,
	NSCTVariationAxisIdentifier = 2003265652,
	NSCTVariationAxisDefaultValue = 1,
	NSCTVariationAxisName = Weight,
	}
)
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CFDictionaryRef __nullable CTFontCopyVariation( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
代码：
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    NSDictionary * axesdic = (__bridge NSDictionary *)CTFontCopyVariationAxes(font);
    NSLog(@"font axes dic %@",axesdic);
结果：
2017-03-02 10:30:01.138 CoreTextDemo[50305:1358978] font axes dic (
    	{
	NSCTVariationAxisMaximumValue = 1.9989,
	NSCTVariationAxisMinimumValue = 0,
	NSCTVariationAxisIdentifier = 2003265652,
	NSCTVariationAxisDefaultValue = 1,
	NSCTVariationAxisName = Weight,
	}
)

11.Font Features

key value 描述
kCTFontOpenTypeFeatureTag CFStringRef
kCTFontOpenTypeFeatureValue CFNumberRef
kCTFontFeatureTypeIdentifierKey CFNumberRef
kCTFontFeatureTypeNameKey CFString
kCTFontFeatureTypeExclusiveKey CFBoolean
kCTFontFeatureTypeSelectorsKey CFArrayRef
kCTFontFeatureSelectorIdentifierKey CFNumberRef
kCTFontFeatureSelectorNameKey CFStringRef
kCTFontFeatureSelectorDefaultKey CFBooleanRef
kCTFontFeatureSelectorSettingKey CFBooleanRef 
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CFArrayRef __nullable CTFontCopyFeatures( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
代码：
    CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
    NSArray *   fontFeatures = (__bridge NSArray *)CTFontCopyFeatures(font);
    NSLog(@"font Features %@",fontFeatures);
结果：
(
        {
        CTFeatureTypeIdentifier = 0;
        CTFeatureTypeName = "All Typographic Features";
        CTFeatureTypeNameID = "-100";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorDefault = 1;
                CTFeatureSelectorIdentifier = 0;
                CTFeatureSelectorName = On;
                CTFeatureSelectorNameID = "-101";
            }
        );
    },
        {
        CTFeatureTypeIdentifier = 1;
        CTFeatureTypeName = Ligatures;
        CTFeatureTypeNameID = "-200";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorDefault = 1;
                CTFeatureSelectorIdentifier = 2;
                CTFeatureSelectorName = "Common Ligatures";
                CTFeatureSelectorNameID = "-203";
            }
        );
    },
        {
        CTFeatureTypeExclusive = 1;
        CTFeatureTypeIdentifier = 6;
        CTFeatureTypeName = "Number Spacing";
        CTFeatureTypeNameID = "-700";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorIdentifier = 0;
                CTFeatureSelectorName = "Monospaced Numbers";
                CTFeatureSelectorNameID = "-701";
            },
                        {
                CTFeatureSelectorIdentifier = 1;
                CTFeatureSelectorName = "Proportional Numbers";
                CTFeatureSelectorNameID = "-702";
            },
                        {
                CTFeatureSelectorDefault = 1;
                CTFeatureSelectorIdentifier = 4;
                CTFeatureSelectorName = "No Change";
                CTFeatureSelectorNameID = "-705";
            }
        );
    },
        {
        CTFeatureTypeExclusive = 1;
        CTFeatureTypeIdentifier = 10;
        CTFeatureTypeName = "Vertical Position";
        CTFeatureTypeNameID = "-1100";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorDefault = 1;
                CTFeatureSelectorIdentifier = 0;
                CTFeatureSelectorName = "Normal Vertical Position";
                CTFeatureSelectorNameID = "-1101";
            },
                        {
                CTFeatureSelectorIdentifier = 1;
                CTFeatureSelectorName = "Superiors/Superscripts";
                CTFeatureSelectorNameID = "-1102";
            },
                        {
                CTFeatureSelectorIdentifier = 2;
                CTFeatureSelectorName = "Inferiors/Subscripts";
                CTFeatureSelectorNameID = "-1103";
            }
        );
    },
        {
        CTFeatureTypeExclusive = 1;
        CTFeatureTypeIdentifier = 11;
        CTFeatureTypeName = "Contextual Fractional Forms";
        CTFeatureTypeNameID = "-1200";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorDefault = 1;
                CTFeatureSelectorIdentifier = 0;
                CTFeatureSelectorName = "No Fractional Forms";
                CTFeatureSelectorNameID = "-1201";
            },
                        {
                CTFeatureSelectorIdentifier = 2;
                CTFeatureSelectorName = Diagonal;
                CTFeatureSelectorNameID = "-1203";
            }
        );
    },
        {
        CTFeatureTypeIdentifier = 33;
        CTFeatureTypeName = "Case-Sensitive Layout";
        CTFeatureTypeNameID = "-3400";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorIdentifier = 0;
                CTFeatureSelectorName = "Capital Forms";
                CTFeatureSelectorNameID = "-3401";
            }
        );
    },
        {
        CTFeatureTypeIdentifier = 35;
        CTFeatureTypeName = "Alternative Stylistic Sets";
        CTFeatureTypeNameID = "-3600";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorIdentifier = 2;
                CTFeatureSelectorName = "Straight-sided six and nine";
                CTFeatureSelectorNameID = 256;
            },
                        {
                CTFeatureSelectorIdentifier = 4;
                CTFeatureSelectorName = "Open four";
                CTFeatureSelectorNameID = 257;
            },
                        {
                CTFeatureSelectorIdentifier = 6;
                CTFeatureSelectorName = "Vertically centered colon";
                CTFeatureSelectorNameID = 258;
            },
                        {
                CTFeatureSelectorIdentifier = 12;
                CTFeatureSelectorName = "High legibility";
                CTFeatureSelectorNameID = 259;
            },
                        {
                CTFeatureSelectorIdentifier = 14;
                CTFeatureSelectorName = "One storey a";
                CTFeatureSelectorNameID = 260;
            }
        );
    },
        {
        CTFeatureTypeIdentifier = 36;
        CTFeatureTypeName = "Contextual Alternates";
        CTFeatureTypeNameID = "-3700";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorDefault = 1;
                CTFeatureSelectorIdentifier = 0;
                CTFeatureSelectorName = "Contextual Alternates";
                CTFeatureSelectorNameID = "-3701";
            }
        );
    },
        {
        CTFeatureTypeExclusive = 1;
        CTFeatureTypeIdentifier = 37;
        CTFeatureTypeName = "Lower Case";
        CTFeatureTypeNameID = "-3800";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorDefault = 1;
                CTFeatureSelectorIdentifier = 0;
                CTFeatureSelectorName = "No Change";
                CTFeatureSelectorNameID = "-3801";
            },
                        {
                CTFeatureSelectorIdentifier = 1;
                CTFeatureSelectorName = "Small Capitals";
                CTFeatureSelectorNameID = "-3802";
            }
        );
    },
        {
        CTFeatureTypeExclusive = 1;
        CTFeatureTypeIdentifier = 38;
        CTFeatureTypeName = "Upper Case";
        CTFeatureTypeNameID = "-3900";
        CTFeatureTypeSelectors =         (
                        {
                CTFeatureSelectorDefault = 1;
                CTFeatureSelectorIdentifier = 0;
                CTFeatureSelectorName = "No Change";
                CTFeatureSelectorNameID = "-3901";
            },
                        {
                CTFeatureSelectorIdentifier = 1;
                CTFeatureSelectorName = "Small Capitals";
                CTFeatureSelectorNameID = "-3902";
            }
        );
    }
)
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CFArrayRef __nullable CTFontCopyFeatureSettings( CTFontRef font ) CT_AVAILABLE(10_5, 3_2);
代码：
	   CTFontRef  font =(__bridge CTFontRef)  [UIFont systemFontOfSize:24];
    
   NSArray * fontSettingsFeatre =(__bridge NSArray * ) CTFontCopyFeatureSettings(font);
    NSLog(@"font features settings %@",fontSettingsFeatre);
    
结果：
2017-03-02 10:44:46.354 CoreTextDemo[50763:1374128] font features settings (null)

12.Font Conversion

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CGFontRef CTFontCopyGraphicsFont(
    CTFontRef           font,
    CTFontDescriptorRef __nullable * __nullable attributes ) CT_AVAILABLE(10_5, 3_2);
    
 讲CTfontRef 转换成CGFontRef
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CTFontRef CTFontCreateWithGraphicsFont(
    CGFontRef                   graphicsFont,
    CGFloat                     size,
    const CGAffineTransform * __nullable matrix,
    CTFontDescriptorRef __nullable attributes ) CT_AVAILABLE(10_5, 3_2);
 将CGfontRef 转换成CTFontRef
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ATSFontRef CTFontGetPlatformFont(
    CTFontRef               font,
    CTFontDescriptorRef __nullable * __nullable attributes ) CT_AVAILABLE_MAC(10_5);
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CTFontRef __nullable CTFontCreateWithPlatformFont(
    ATSFontRef                  platformFont,
    CGFloat                     size,
    const CGAffineTransform * __nullable matrix,
    CTFontDescriptorRef __nullable attributes ) CT_AVAILABLE_MAC(10_5);
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CTFontRef CTFontCreateWithQuickdrawInstance(
    ConstStr255Param __nullable name,
    int16_t             identifier,
    uint8_t             style,
    CGFloat             size ) CT_AVAILABLE_MAC(10_5);

13.Font Tables

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enum {
    kCTFontTableBASE    = 'BASE',   // Baseline
    kCTFontTableCFF     = 'CFF ',   // PostScript font program
    kCTFontTableDSIG    = 'DSIG',   // Digital signature
    kCTFontTableEBDT    = 'EBDT',   // Embedded bitmap
    kCTFontTableEBLC    = 'EBLC',   // Embedded bitmap location
    kCTFontTableEBSC    = 'EBSC',   // Embedded bitmap scaling
    kCTFontTableGDEF    = 'GDEF',   // Glyph definition
    kCTFontTableGPOS    = 'GPOS',   // Glyph positioning
    kCTFontTableGSUB    = 'GSUB',   // Glyph substitution
    kCTFontTableJSTF    = 'JSTF',   // Justification
    kCTFontTableLTSH    = 'LTSH',   // Linear threshold
    kCTFontTableMATH    = 'MATH',   // Math
    kCTFontTableOS2     = 'OS/2',   // OS/2 and Windows specific metrics
    kCTFontTablePCLT    = 'PCLT',   // PCL 5 data
    kCTFontTableVDMX    = 'VDMX',   // Vertical device metrics
    kCTFontTableVORG    = 'VORG',   // Vertical origin
    kCTFontTableZapf    = 'Zapf',   // Glyph reference
    kCTFontTableAcnt    = 'acnt',   // Accent attachment
    kCTFontTableAnkr    = 'ankr',   // Anchor points
    kCTFontTableAvar    = 'avar',   // Axis variation
    kCTFontTableBdat    = 'bdat',   // Bitmap data
    kCTFontTableBhed    = 'bhed',   // Bitmap font header
    kCTFontTableBloc    = 'bloc',   // Bitmap location
    kCTFontTableBsln    = 'bsln',   // Baseline
    kCTFontTableCmap    = 'cmap',   // Character to glyph mapping
    kCTFontTableCvar    = 'cvar',   // CVT variation
    kCTFontTableCvt     = 'cvt ',   // Control value table
    kCTFontTableFdsc    = 'fdsc',   // Font descriptor
    kCTFontTableFeat    = 'feat',   // Layout feature
    kCTFontTableFmtx    = 'fmtx',   // Font metrics
    kCTFontTableFpgm    = 'fpgm',   // Font program
    kCTFontTableFvar    = 'fvar',   // Font variation
    kCTFontTableGasp    = 'gasp',   // Grid-fitting/Scan-conversion
    kCTFontTableGlyf    = 'glyf',   // Glyph data
    kCTFontTableGvar    = 'gvar',   // Glyph variation
    kCTFontTableHdmx    = 'hdmx',   // Horizontal device metrics
    kCTFontTableHead    = 'head',   // Font header
    kCTFontTableHhea    = 'hhea',   // Horizontal header
    kCTFontTableHmtx    = 'hmtx',   // Horizontal metrics
    kCTFontTableHsty    = 'hsty',   // Horizontal style
    kCTFontTableJust    = 'just',   // Justification
    kCTFontTableKern    = 'kern',   // Kerning
    kCTFontTableKerx    = 'kerx',   // Extended kerning
    kCTFontTableLcar    = 'lcar',   // Ligature caret
    kCTFontTableLtag    = 'ltag',   // Language tags
    kCTFontTableLoca    = 'loca',   // Index to location
    kCTFontTableMaxp    = 'maxp',   // Maximum profile
    kCTFontTableMort    = 'mort',   // Morph
    kCTFontTableMorx    = 'morx',   // Extended morph
    kCTFontTableName    = 'name',   // Naming table
    kCTFontTableOpbd    = 'opbd',   // Optical bounds
    kCTFontTablePost    = 'post',   // PostScript information
    kCTFontTablePrep    = 'prep',   // CVT program
    kCTFontTableProp    = 'prop',   // Properties
    kCTFontTableSbit    = 'sbit',   // Bitmap data
    kCTFontTableSbix    = 'sbix',   // Extended bitmap data
    kCTFontTableTrak    = 'trak',   // Tracking
    kCTFontTableVhea    = 'vhea',   // Vertical header
    kCTFontTableVmtx    = 'vmtx'    // Vertical metrics
};
typedef FourCharCode CTFontTableTag;
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typedef CF_OPTIONS(uint32_t, CTFontTableOptions) {
    kCTFontTableOptionNoOptions CT_ENUM_AVAILABLE(10_5, 3_2) = 0,
    kCTFontTableOptionExcludeSynthetic CT_ENUM_DEPRECATED(10_5, 10_8, 3_2, 6_0) = (1 << 0)
};
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CFArrayRef __nullable CTFontCopyAvailableTables(
    CTFontRef           font,
    CTFontTableOptions  options ) CT_AVAILABLE(10_5, 3_2);
    
    运行崩溃
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CFDataRef __nullable CTFontCopyTable(
    CTFontRef           font,
    CTFontTableTag      table,
    CTFontTableOptions  options ) CT_AVAILABLE(10_5, 3_2);
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void CTFontDrawGlyphs(
    CTFontRef       font, 
    const CGGlyph   glyphs[], 
    const CGPoint   positions[], 
    size_t          count, 
    CGContextRef    context ) CT_AVAILABLE(10_7, 4_2);
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CFIndex CTFontGetLigatureCaretPositions(
    CTFontRef       font,
    CGGlyph         glyph,
    CGFloat * __nullable positions,
    CFIndex         maxPositions ) CT_AVAILABLE(10_5, 3_2);

14.Baseline Alignment

key value 描述
kCTBaselineClassRoman CFNumberRef
kCTBaselineClassIdeographicCentered CFNumberRef
kCTBaselineClassIdeographicLow CFNumberRef
kCTBaselineClassIdeographicHigh CFNumberRef
kCTBaselineClassHanging CFNumberRef
kCTBaselineClassMath CFNumberRef
kCTBaselineReferenceFont CTFontRef
kCTBaselineOriginalFont 
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CFArrayRef __nullable CTFontCopyDefaultCascadeListForLanguages( CTFontRef font, CFArrayRef __nullable languagePrefList )
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tag:

    缺失模块。
    1、在博客根目录（注意不是yilia根目录）执行以下命令：
    npm i hexo-generator-json-content --save

    2、在根目录_config.yml里添加配置： 

      jsonContent:
    meta: false
    pages: false
    posts:
      title: true
      date: true
      path: true
      text: true
      raw: false
      content: false
      slug: false
      updated: false
      comments: false
      link: false
      permalink: false
      excerpt: false
      categories: false
      tags: true

很惭愧<br><br>只做了一点微小的工作<br>谢谢大家