CTParagraphStyle.h学习

从 Paragraph Style Types Paragraph Style Values Paragraph Style Creation Paragraph Style Access 四个方面来学习 CTParagraphStyle 样式

1.Paragraph Style Types

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CFTypeID CTParagraphStyleGetTypeID( void ) CT_AVAILABLE(10_5, 3_2);
获取CTParagraphStyle ID

2.Paragraph Style Values

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typedef CF_ENUM(uint8_t, CTTextAlignment) {
    kCTTextAlignmentLeft      CT_ENUM_AVAILABLE(10_8, 6_0) = 0,
    kCTTextAlignmentRight     CT_ENUM_AVAILABLE(10_8, 6_0) = 1,
    kCTTextAlignmentCenter    CT_ENUM_AVAILABLE(10_8, 6_0) = 2,
    kCTTextAlignmentJustified CT_ENUM_AVAILABLE(10_8, 6_0) = 3,
    kCTTextAlignmentNatural   CT_ENUM_AVAILABLE(10_8, 6_0) = 4,
    kCTLeftTextAlignment CT_ENUM_DEPRECATED(10_5, 10_11, 3_2, 9_0) = kCTTextAlignmentLeft,
    kCTRightTextAlignment CT_ENUM_DEPRECATED(10_5, 10_11, 3_2, 9_0) = kCTTextAlignmentRight,
    kCTCenterTextAlignment CT_ENUM_DEPRECATED(10_5, 10_11, 3_2, 9_0) = kCTTextAlignmentCenter,
    kCTJustifiedTextAlignment CT_ENUM_DEPRECATED(10_5, 10_11, 3_2, 9_0) = kCTTextAlignmentJustified,
    kCTNaturalTextAlignment CT_ENUM_DEPRECATED(10_5, 10_11, 3_2, 9_0) = kCTTextAlignmentNatural
};
文本对齐
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typedef CF_ENUM(uint8_t, CTLineBreakMode) {
    kCTLineBreakByWordWrapping = 0,
    kCTLineBreakByCharWrapping = 1,
    kCTLineBreakByClipping = 2,
    kCTLineBreakByTruncatingHead = 3,
    kCTLineBreakByTruncatingTail = 4,
    kCTLineBreakByTruncatingMiddle = 5
};
文本break mode
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typedef CF_ENUM(int8_t, CTWritingDirection) {
    kCTWritingDirectionNatural = -1,
    kCTWritingDirectionLeftToRight = 0,
    kCTWritingDirectionRightToLeft = 1
};
书写方向
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typedef CF_ENUM(uint32_t, CTParagraphStyleSpecifier) {
    kCTParagraphStyleSpecifierAlignment = 0,
    kCTParagraphStyleSpecifierFirstLineHeadIndent = 1,
    kCTParagraphStyleSpecifierHeadIndent = 2,
    kCTParagraphStyleSpecifierTailIndent = 3,
    kCTParagraphStyleSpecifierTabStops = 4,
    kCTParagraphStyleSpecifierDefaultTabInterval = 5,
    kCTParagraphStyleSpecifierLineBreakMode = 6,
    kCTParagraphStyleSpecifierLineHeightMultiple = 7,
    kCTParagraphStyleSpecifierMaximumLineHeight = 8,
    kCTParagraphStyleSpecifierMinimumLineHeight = 9,
    kCTParagraphStyleSpecifierLineSpacing CT_ENUM_DEPRECATED(10_5, 10_8, 3_2, 6_0) = 10,
    kCTParagraphStyleSpecifierParagraphSpacing = 11,
    kCTParagraphStyleSpecifierParagraphSpacingBefore = 12,
    kCTParagraphStyleSpecifierBaseWritingDirection = 13,
    kCTParagraphStyleSpecifierMaximumLineSpacing = 14,
    kCTParagraphStyleSpecifierMinimumLineSpacing = 15,
    kCTParagraphStyleSpecifierLineSpacingAdjustment = 16,
    kCTParagraphStyleSpecifierLineBoundsOptions = 17,
    kCTParagraphStyleSpecifierCount
};
段落可以修改的部分

针对Specifier 所对应的表格

key value default 解释
kCTParagraphStyleSpecifierAlignment CTTextAlignment kCTTextAlignmentNatural 文本对齐
kCTParagraphStyleSpecifierFirstLineHeadIndent CGFloat 0.0 首行缩进
kCTParagraphStyleSpecifierHeadIndent CGFloat 0.0 除了首行都缩进
kCTParagraphStyleSpecifierTailIndent CGFloat 0.0 相当文本宽度
kCTParagraphStyleSpecifierTabStops CFArray of CTTextTabRef 12 left-aligned tabs, spaced by 28.0 points
kCTParagraphStyleSpecifierDefaultTabInterval CGFloat 0.0
kCTParagraphStyleSpecifierLineBreakMode CTLineBreakMode kCTLineBreakByWordWrapping 换行模式
kCTParagraphStyleSpecifierLineHeightMultiple CGFloat 0.0 不知道杂用
kCTParagraphStyleSpecifierMaximumLineHeight CGFloat 0.0 最大行高
kCTParagraphStyleSpecifierMinimumLineHeight CGFloat 0.0 最小行高
kCTParagraphStyleSpecifierLineSpacing CGFloat 0.0 Deprecated 废弃了
kCTParagraphStyleSpecifierParagraphSpacing CGFloat 0.0 段间距
kCTParagraphStyleSpecifierParagraphSpacingBefore CGFloat 0.0 段前距离
kCTParagraphStyleSpecifierBaseWritingDirection CTWritingDirection kCTWritingDirectionNatural 方向（奇怪）
kCTParagraphStyleSpecifierMaximumLineSpacing CGFloat 0.0 行最大间隔
kCTParagraphStyleSpecifierMinimumLineSpacing CGFloat 0.0 行最小间隔
kCTParagraphStyleSpecifierLineSpacingAdjustment CGFloat 0.0 废弃
kCTParagraphStyleSpecifierLineBoundsOptions CTLineBoundsOptions 0 不会用

下面是每个Specifier 对应的 效果

kCTParagraphStyleSpecifierAlignment

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代码：
-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习/慢慢来吧。不是一朝一夕之功。ok \n ok ok"];
    
   CTTextAlignment alignment = kCTTextAlignmentRight;
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierAlignment;
    setting.value = &alignment;
    setting.valueSize = sizeof(alignment);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 0 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果：

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kCTParagraphStyleSpecifierFirstLineHeadIndent

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-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功。ok \n ok ok"];
    
    
    CGFloat FirstLineHeadIndent =50;;
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierFirstLineHeadIndent;
    setting.value = &FirstLineHeadIndent;
    setting.valueSize = sizeof(FirstLineHeadIndent);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    
    
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 0 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果： 每个段落的首行 缩进

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kCTParagraphStyleSpecifierHeadIndent

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代码：
-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功。ok \n ok ok"];
    CGFloat HeadIndent =50;;
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierHeadIndent;
    setting.value = &HeadIndent;
    setting.valueSize = sizeof(HeadIndent);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 0 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果：除了首行都缩进

image

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typedef struct CTParagraphStyleSetting
{
    CTParagraphStyleSpecifier spec;
    size_t valueSize;
    const void * value;
} CTParagraphStyleSetting;
段落每项设置都要通过这个结构体来实现

kCTParagraphStyleSpecifierTailIndent

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代码：
-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功。ok \n ok ok"];
    CGFloat TailIndent =150;;
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierTailIndent;
    setting.value = &TailIndent;
    setting.valueSize = sizeof(TailIndent);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 0 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果：相当于文本 的宽度

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kCTParagraphStyleSpecifierMaximumLineHeight最小行间距

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代码
-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不helloworld  ok一朝一夕之功富文本学习慢慢来吧。不  是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功。"];
    CGFloat LineHeightMultiple =7;;
    
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierMaximumLineHeight;
    setting.value = &LineHeightMultiple;
    setting.valueSize = sizeof(LineHeightMultiple);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 40 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果：

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kCTParagraphStyleSpecifierMinimumLineHeight

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代码
-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不helloworld  ok一朝一夕之功富文本学习慢慢来吧。不  是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功。"];
    CGFloat LineHeightMultiple =30;;
    
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierMinimumLineHeight;
    setting.value = &LineHeightMultiple;
    setting.valueSize = sizeof(LineHeightMultiple);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 40 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果

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kCTParagraphStyleSpecifierParagraphSpacing 段间隔

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代码：
-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不helloworld  ok一朝一夕之功富文本学习慢慢来吧。不 \n 是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功。"];
    CGFloat LineHeightMultiple =30;;
    
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierParagraphSpacing;
    setting.value = &LineHeightMultiple;
    setting.valueSize = sizeof(LineHeightMultiple);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 40 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果：

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kCTParagraphStyleSpecifierParagraphSpacingBefore 这个没看出啥，段开始部分间距。排除第一段？

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kCTParagraphStyleSpecifierBaseWritingDirection 基本书写方向

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kCTParagraphStyleSpecifierMinimumLineSpacing 最小行间距

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-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不helloworld  ok一朝一夕之功富文本学习慢慢来吧。不 \n 是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧\n。不是一朝一夕之功。"];
    CGFloat LineHeightMultiple =20;;
    
    CTWritingDirection dir = kCTWritingDirectionRightToLeft;
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierMinimumLineSpacing;
    setting.value = &LineHeightMultiple;
    setting.valueSize = sizeof(LineHeightMultiple);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 40 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

效果：

​ image

3.Paragraph Style Creation

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CTParagraphStyleRef CTParagraphStyleCreate(
    const CTParagraphStyleSetting * __nullable settings,
    size_t settingCount ) CT_AVAILABLE(10_5, 3_2);
创建一个段落。 用法
-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习/慢慢来吧。不是一朝一夕之功。ok \n ok ok"];
    
   CTTextAlignment alignment = kCTTextAlignmentRight;
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierAlignment;
    setting.value = &alignment;
    setting.valueSize = sizeof(alignment);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 0 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果：

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kCTParagraphStyleSpecifierLineBreakMode

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-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不helloworld  ok一朝一夕之功富文本学习慢慢来吧。不  是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功。ok \n ok ok"];
    CGFloat TailIndent =150;;
    CTParagraphStyleSetting setting ;
   CTLineBreakMode breakMode= kCTLineBreakByWordWrapping;
    setting.spec = kCTParagraphStyleSpecifierLineBreakMode;
    setting.value = &breakMode;
    setting.valueSize = sizeof(breakMode);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 0 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

结果：kCTLineBreakByWordWrapping word 换行

image

kCTLineBreakByCharWrapping char 字符换行

image

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修改代码
  -(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不helloworld  ok一朝一夕之功富文本学习慢慢来吧。不  是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功富文本学习慢慢来吧。不是一朝一夕之功。ok \n ok ok"];
    CGFloat TailIndent =150;;
    
    CTParagraphStyleSetting setting ;
   CTLineBreakMode breakMode= kCTLineBreakByClipping;
    setting.spec = kCTParagraphStyleSpecifierLineBreakMode;
    setting.value = &breakMode;
    setting.valueSize = sizeof(breakMode);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , self.bounds.size.height-60 ,self.bounds.size.width-10 , 60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}

kCTLineBreakByClipping 尾部截断

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kCTLineBreakByTruncatingHead 头部…

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kCTLineBreakByTruncatingTail 尾部 …

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kCTLineBreakByTruncatingMiddle 中间 …

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CTParagraphStyleRef CTParagraphStyleCreateCopy(
    CTParagraphStyleRef paragraphStyle ) CT_AVAILABLE(10_5, 3_2);
这个就是copy 出来一个 CTParagraphStyleRef

4.Paragraph Style Access

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bool CTParagraphStyleGetValueForSpecifier(
    CTParagraphStyleRef paragraphStyle,
    CTParagraphStyleSpecifier spec,
    size_t valueBufferSize,
    void * valueBuffer ) CT_AVAILABLE(10_5, 3_2);
    
  获取 paragraphStyle 中 spec 对应的值， 放入valueBuffer 。要是放入失败，那么返回false
  
  代码：
  	-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学习/慢慢来吧。不是一朝一夕之功。ok \n ok ok"];
    
   CTTextAlignment alignment = kCTTextAlignmentRight;
    CTParagraphStyleSetting setting ;
    setting.spec = kCTParagraphStyleSpecifierAlignment;
    setting.value = &alignment;
    setting.valueSize = sizeof(alignment);
   CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(&setting, 1);
    NSMutableDictionary * dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    
    
    
  bool issuccess =  CTParagraphStyleGetValueForSpecifier(paragraphStyle, kCTParagraphStyleSpecifierAlignment, sizeof(alignment), &alignment);
    if (issuccess) {
        NSLog(@"paragraphStyle issuccess kCTParagraphStyleSpecifierAlignment");
    }
    
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 0 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
}
结果：
2017-03-02 15:38:49.533 CoreTextDemo[52027:1578356] paragraphStyle issuccess kCTParagraphStyleSpecifierAlignment
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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