CTLine.h学习

CTFrame布局是由Path 和CTLine 组成的。

我们能从CTLine中获取到什么信息呢。

我们从以下方面 Line Types, Line Creation,Line Access ,Line Measurement, Line Caret Positioning and Highlighting

1. Line Types

1
2
CFTypeID CTLineGetTypeID( void )
获取CTLine的 CFTypeID

枚举值 CTLineBoundsOptions 和 CTLineTruncationType

1
2
3
4
5
6
7
8
typedef CF_OPTIONS(CFOptionFlags, CTLineBoundsOptions) {
    kCTLineBoundsExcludeTypographicLeading  = 1 << 0,
    kCTLineBoundsExcludeTypographicShifts   = 1 << 1,
    kCTLineBoundsUseHangingPunctuation      = 1 << 2,
    kCTLineBoundsUseGlyphPathBounds         = 1 << 3,
    kCTLineBoundsUseOpticalBounds           = 1 << 4,
    kCTLineBoundsIncludeLanguageExtents CT_ENUM_AVAILABLE(10_11, 8_0) = 1 << 5,
};

目前看上面的枚举值不知道具体有啥用。放过，等看完下面的回来补充。

1
2
3
4
5
6
7
8
typedef CF_ENUM(uint32_t, CTLineTruncationType) {
    kCTLineTruncationStart  = 0,
    kCTLineTruncationEnd    = 1,
    kCTLineTruncationMiddle = 2
};
这个kCTLineTruncationStart 截断头部
kCTLineTruncationEnd 截断尾部
kCTLineTruncationMiddle 截断中间

2.Line Creation

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CTLineRef CTLineCreateWithAttributedString(
    CFAttributedStringRef attrString )  
根据CFAttributedStringRef 创建一个 CTLineRef     这个只能创建一行文本。
//CTLine
-(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:@"富文本学习富文本学习富文本学习富文本学习富文本学习富文本学习富文本学习富文本学习"];
   CTLineRef line = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)mabstring);
    CTLineDraw(line, context);
}

效果如下：

image

文字一行排开。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
CTLineRef __nullable CTLineCreateTruncatedLine(
    CTLineRef line,
    double width,
    CTLineTruncationType truncationType,
    CTLineRef __nullable truncationToken )
    
   line 创建的截断的线
   width 截断位置
   truncationType 截断类型 头部截断还是中部尾部截断
   truncationToken  这个是截断标志  不能让 truncationToken 线宽大于 width 要是大于width 函数返回NULL。  截断替代符。
   
-(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。总是么盛大的饭卡多看看案发扩大到非卡卡打卡卡"];
   CTLineRef line = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)mabstring);
    
    mabstring = [[NSMutableAttributedString alloc]initWithString:@"dd"];
   CTLineRef  linetoken = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)mabstring);
    
    
    CTLineRef lineTru = CTLineCreateTruncatedLine(line, 300, kCTLineTruncationStart, linetoken);
//    CTLineDraw(line, context);
    CTLineDraw(lineTru, context);
}

头部截断效果如下：

image

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
CTLineRef __nullable CTLineCreateJustifiedLine(
    CTLineRef line,
    CGFloat justificationFactor,
    double justificationWidth )
    line 参考线
    justificationFactor  调整文字显示宽度比例 。大于等于1 就是justificationWidth 小于 1 大于零  宽度就是justificationFactor * justificationWidth
    justificationWidth 宽度。
   调整宽度小于实际宽度，文字会被压扁。
    
    //CTLine
-(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"];
   CTLineRef line = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)mabstring);
    
  CTLineRef lineJustified =  CTLineCreateJustifiedLine(line, 1, 300);
    
    CTLineDraw(line, context);
    CTLineDraw(lineJustified, context);
}

效果如图

image

要是文本过长，justificationFactor 必须大于等于 1 否则，不进行CTLine绘制。

代码如下

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
//CTLine
-(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。总是么盛大的饭卡多看看案发扩大到非卡卡打卡卡"];
   CTLineRef line = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)mabstring);
    
  CTLineRef lineJustified =  CTLineCreateJustifiedLine(line, 1, 300);
    
//    CTLineDraw(line, context);
    CTLineDraw(lineJustified, context);
}

效果图：

image

文字压扁了。

3.Line Access

CFIndex CTLineGetGlyphCount( CTLineRef line ) 获取Glyph的个数
CFArrayRef CTLineGetGlyphRuns(CTLineRef line ) 获取CTRunRef数组
CFRange CTLineGetStringRange(CTLineRef line ) 获取线所在字符串的范围
double CTLineGetPenOffsetForFlush( CTLineRef line, CGFloat flushFactor, double flushWidth ) 文本flushFactor比例的距离到flushWidthflushFactor的距离 flushFactor大于1 相当于1操作。公式 假设文本长度textWidth 结果result=flushWidth flushFactor - flushFactor * textWidth
void CTLineDraw( CTLineRef line, CGContextRef context ) 绘制线。位置是从底部向上绘制。 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
-(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。总是么盛大的饭卡多看看案发扩大到非卡卡打卡卡"];
   CTLineRef line = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)mabstring);
    
    mabstring = [[NSMutableAttributedString alloc]initWithString:@"dd"];
   CTLineRef  linetoken = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)mabstring);
    
    
    CTLineRef lineTru = CTLineCreateTruncatedLine(line, 300, kCTLineTruncationStart, linetoken);
//    CTLineDraw(line, context);
    
    
    CTLineDraw(line, context);
    double offset =  CTLineGetPenOffsetForFlush(line, 2, 100);
    NSLog(@"line offset %f",offset);
    ///access
    CFIndex index =   CTLineGetGlyphCount(lineTru);
    NSLog(@"line glyph %ld",index);
    index =   CTLineGetGlyphCount(line);
    NSLog(@"line glyph %ld",index);
    
    
  NSArray * runArr = (__bridge NSArray *)  CTLineGetGlyphRuns(line);
    NSLog(@"runArr %@" ,runArr);
    CFRange range =  CTLineGetStringRange(lineTru );
    NSLog(@"line range %ld %ld",range.location,range.length);
    range =  CTLineGetStringRange(line);
    NSLog(@"line range %ld %ld",range.location,range.length);
}
结果：
2017-02-24 17:07:16.149 CoreTextDemo[5171:125678] line offset 0.000000
2017-02-24 17:07:16.149 CoreTextDemo[5171:125678] line glyph 25
2017-02-24 17:07:16.149 CoreTextDemo[5171:125678] line glyph 41
2017-02-24 17:07:16.150 CoreTextDemo[5171:125678] runArr (
    "<CTRun: 0x7febf3709730>{string range = (0, 41), string = \"\\u5BCC\\u6587\\u672C\\u5B66\\u4E60\\u6162\\u6162\\u6765\\u5427\\u3002\\u4E0D\\u662F\\u4E00\\u671D\\u4E00\\u5915\\u4E4B\\u529F\\u3002\\u603B\\u662F\\u4E48\\u76DB\\u5927\\u7684\\u996D\\u5361\\u591A\\u770B\\u770B\\u6848\\u53D1\\u6269\\u5927\\u5230\\u975E\\u5361\\u5361\\u6253\\u5361\\u5361\", attributes = <CFBasicHash 0x600000266940 [0x10f4b1c70]>{type = mutable dict, count = 1,\nentries =>\n\t2 : <CFString 0x10fe6e788 [0x10f4b1c70]>{contents = \"NSFont\"} = <CTFont: 0x7febf3709600>{name = PingFangSC-Regular, size = 12.000000, matrix = 0x0, descriptor = <CTFontDescriptor: 0x608000094e60>{attributes = <CFBasicHash 0x60800026d980 [0x10f4b1c70]>{type = mutable dict, count = 1,\nentries =>\n\t2 : <CFString 0x10fe74908 [0x10f4b1c70]>{contents = \"NSFontNameAttribute\"} = <CFString 0x11cda06c0 [0x10f4b1c70]>{contents = \"PingFangSC-Regular\"}\n}\n>}}\n}\n}"
)
2017-02-24 17:07:16.150 CoreTextDemo[5171:125678] line range 0 41
2017-02-24 17:07:16.152 CoreTextDemo[5171:125678] line range 0 41

从上面结果看：CTLineGetStringRange获取的范围可能会有问题。用的时候要小心（要是自己创建CTline的话）这个只是自己创建的CTline不准，而CTFrame创建的CTLine是没问题的。

CTLineGetPenOffsetForFlush 函数相当于 文本到某点还有多少距离。

测试代码是

1
2
3
4
5
6
7
8
9
 NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"富文本学"];
   CTLineRef line = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)mabstring);
    CTLineDraw(line, context);
    double offset =  CTLineGetPenOffsetForFlush(line,0.5, 300);
    NSLog(@"line offset %f",offset);

如图

image

打印结果是2017-02-24 19:33:15.061 CoreTextDemo[4317:74402] line offset 126.000000

4.Line Measurement

CTLineGetTypographicBounds( CTLineRef line,CGFloat __nullable ascent,CGFloat nullable descent, CGFloat * nullable leading ) 获取线 的ascent descent leading ,返回宽度
CGRect CTLineGetBoundsWithOptions(CTLineRef line,CTLineBoundsOptions options ) 目前还不知道CTLineBoundsOptions 代表啥。 应该与富文本的设置有关。暂时不做研究（这个就是获取不同设置line的bounds的）
double CTLineGetTrailingWhitespaceWidth(CTLineRef line ) 目前还不会用(获取结尾空白的宽度)
CGRect CTLineGetImageBounds(CTLineRef line,CGContextRef __nullable context ) 目前还不会用(获取的是line绘制成图片的尺寸) 
1
2
3
4
5
CGFloat ascent;
CGFloat descent;
CGFloat leading;
CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
NSLog(@"line ascent %f,descent %f,leading %f",ascent,descent,leading);

5.Line Caret Positioning and Highlighting

CFIndex CTLineGetStringIndexForPosition(CTLineRef line,CGPoint position ) 获取线position位置的String index
CGFloat CTLineGetOffsetForStringIndex(CTLineRef line,CFIndex charIndex,CGFloat * __nullable secondaryOffset ) 获取index位置字符的偏移量。目前不知道 返回结果和secondaryOffset 的区别
void CTLineEnumerateCaretOffsets(CTLineRef line,void (^block)(double offset, CFIndex charIndex, bool leadingEdge, bool* stop) ) CT_AVAILABLE(10_11, 9_0) 返回每个字体的前后边沿 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
CFIndex stringIndex =  CTLineGetStringIndexForPosition(line, CGPointMake(20,3 ));
    NSLog(@"line StringIndex %ld",stringIndex);
    
    CGFloat  secondaryOffset;
   CGFloat offsetIndex = CTLineGetOffsetForStringIndex(line, 2,&secondaryOffset );
    NSLog(@"line IndexOffset %lf ,secondaryOffset %lf",offsetIndex,secondaryOffset);
    
    CTLineEnumerateCaretOffsets(line, ^(double offset, CFIndex charIndex, bool leadingEdge, bool * _Nonnull stop) {
        NSLog(@" offset %lf,charindex %ld,leadingEdge %d",offset,charIndex,leadingEdge);
    });
结果
2017-02-27 11:29:21.537 CoreTextDemo[6188:222405] line StringIndex 2
2017-02-27 11:29:21.537 CoreTextDemo[6188:222405] line IndexOffset 24.000000 ,secondaryOffset 24.000000
2017-02-27 11:29:21.537 CoreTextDemo[6188:222405]  offset 0.000000,charindex 0,leadingEdge 1
2017-02-27 11:29:21.538 CoreTextDemo[6188:222405]  offset 12.000000,charindex 0,leadingEdge 0
2017-02-27 11:29:21.538 CoreTextDemo[6188:222405]  offset 12.000000,charindex 1,leadingEdge 1
2017-02-27 11:29:21.538 CoreTextDemo[6188:222405]  offset 24.000000,charindex 1,leadingEdge 0
2017-02-27 11:29:21.538 CoreTextDemo[6188:222405]  offset 24.000000,charindex 2,leadingEdge 1
2017-02-27 11:29:21.538 CoreTextDemo[6188:222405]  offset 36.000000,charindex 2,leadingEdge 0
2017-02-27 11:29:21.538 CoreTextDemo[6188:222405]  offset 36.000000,charindex 3,leadingEdge 1
2017-02-27 11:29:21.539 CoreTextDemo[6188:222405]  offset 48.000000,charindex 3,leadingEdge 0

CTLine 的模型图

image

难点公关

CTLineGetBoundsWithOptions

代码测试

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
    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富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok"];
    
    CTParagraphStyleSetting setting[1] ;
    CGFloat vale =30;
    setting[0].spec = kCTParagraphStyleSpecifierMinimumLineSpacing;
    setting[0].valueSize =sizeof(CGFloat);
    setting[0].value = &vale;
    CTParagraphStyleRef stlye = CTParagraphStyleCreate(setting, 1);
    NSMutableDictionary * dic1 = [NSMutableDictionary dictionaryWithObject:(__bridge id)stlye forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [mabstring setAttributes:dic1 range:NSMakeRange(0, mabstring.length)];
    
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(0 , 0 ,self.bounds.size.width , self.bounds.size.height-60));
    
    NSMutableDictionary * Framedic = [NSMutableDictionary dictionary];
    
    [Framedic setObject:@(kCTFrameProgressionTopToBottom) forKey:(__bridge NSString *)kCTFrameProgressionAttributeName];
    [Framedic setObject:@(kCTFramePathFillEvenOdd) forKey:(__bridge NSString *)kCTFramePathFillRuleAttributeName];
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, (__bridge CFDictionaryRef) Framedic);
    
    CGRect rectBoud = CGPathGetBoundingBox(Path);
    CFRange fitRange = CFRangeMake(0, 0);
    
    
    CGSize size =CTFramesetterSuggestFrameSizeWithConstraints(framesetter, range, (__bridge CFDictionaryRef) Framedic, rectBoud.size, &fitRange);
    CTFrameDraw(frame,context);
    NSArray * array = (__bridge NSArray * )CTFrameGetLines(frame);
    
    for (int i=0; i<array.count; i++) {
        CTLineRef line = (__bridge CTLineRef)(array[i]);
        for (int j=0; j<7; j++) {
            CGRect rect =  CTLineGetBoundsWithOptions(line,(1*2*j-1)<0?0:(1*2*j-1));
            NSLog(@"line %d rect %@ ",j,NSStringFromCGRect(rect));
            UIView * view = [[UIView alloc]initWithFrame:CGRectMake(rect.origin.x, -rect.origin.y+60+i*16.8+30*i, rect.size.width, rect.size.height)];
            [self addSubview:view];
            view.layer.borderColor =[UIColor redColor].CGColor;
            view.layer.borderWidth = 0.5;
        }
        
    }
结果：
2017-03-07 17:18:41.100 CoreTextDemo[69713:2887064] line 0 rect {{0, -4.0800000000000001}, {269.34375, 16.800000000000001}} 
2017-03-07 17:18:41.101 CoreTextDemo[69713:2887064] line 1 rect {{0, -4.0800000000000001}, {269.34375, 16.800000000000001}} 
2017-03-07 17:18:41.101 CoreTextDemo[69713:2887064] line 2 rect {{0, -4.0800000000000001}, {269.34375, 16.800000000000001}} 
2017-03-07 17:18:41.101 CoreTextDemo[69713:2887064] line 3 rect {{0, -4.0800000000000001}, {266.009765625, 16.800000000000001}} 
2017-03-07 17:18:41.102 CoreTextDemo[69713:2887064] line 4 rect {{0, -4.0800000000000001}, {266.009765625, 16.800000000000001}} 
2017-03-07 17:18:41.102 CoreTextDemo[69713:2887064] line 5 rect {{0.94800000000000006, -1.944}, {256.20576562500003, 11.867999999999999}} 
2017-03-07 17:18:41.102 CoreTextDemo[69713:2887064] line 6 rect {{0.94800000000000006, -1.944}, {256.20576562500003, 11.867999999999999}} 
2017-03-07 17:18:41.102 CoreTextDemo[69713:2887064] line 0 rect {{0, -4.0800000000000001}, {374.70703125, 16.800000000000001}} 
2017-03-07 17:18:41.103 CoreTextDemo[69713:2887064] line 1 rect {{0, -4.0800000000000001}, {374.70703125, 16.800000000000001}} 
2017-03-07 17:18:41.103 CoreTextDemo[69713:2887064] line 2 rect {{0, -4.0800000000000001}, {374.70703125, 16.800000000000001}} 
2017-03-07 17:18:41.103 CoreTextDemo[69713:2887064] line 3 rect {{0, -4.0800000000000001}, {374.70703125, 16.800000000000001}} 
2017-03-07 17:18:41.103 CoreTextDemo[69713:2887064] line 4 rect {{0, -4.0800000000000001}, {374.70703125, 16.800000000000001}} 
2017-03-07 17:18:41.104 CoreTextDemo[69713:2887064] line 5 rect {{3.6796875, -1.3200000000000001}, {371.314453125, 11.244}} 
2017-03-07 17:18:41.104 CoreTextDemo[69713:2887064] line 6 rect {{3.6796875, -1.3200000000000001}, {371.314453125, 11.244}} 
2017-03-07 17:18:41.104 CoreTextDemo[69713:2887064] line 0 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.105 CoreTextDemo[69713:2887064] line 1 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.105 CoreTextDemo[69713:2887064] line 2 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.105 CoreTextDemo[69713:2887064] line 3 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.105 CoreTextDemo[69713:2887064] line 4 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.105 CoreTextDemo[69713:2887064] line 5 rect {{0.52800000000000002, -1.3200000000000001}, {362.15742187500001, 11.244}} 
2017-03-07 17:18:41.106 CoreTextDemo[69713:2887064] line 6 rect {{0.52800000000000002, -1.3200000000000001}, {362.15742187500001, 11.244}} 
2017-03-07 17:18:41.106 CoreTextDemo[69713:2887064] line 0 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.106 CoreTextDemo[69713:2887064] line 1 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.107 CoreTextDemo[69713:2887064] line 2 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.107 CoreTextDemo[69713:2887064] line 3 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.107 CoreTextDemo[69713:2887064] line 4 rect {{0, -4.0800000000000001}, {363.357421875, 16.800000000000001}} 
2017-03-07 17:18:41.108 CoreTextDemo[69713:2887064] line 5 rect {{0.59999999999999998, -1.3200000000000001}, {355.32942187499998, 11.244}} 
2017-03-07 17:18:41.108 CoreTextDemo[69713:2887064] line 6 rect {{0.59999999999999998, -1.3200000000000001}, {355.32942187499998, 11.244}} 
2017-03-07 17:18:41.108 CoreTextDemo[69713:2887064] line 0 rect {{0, -4.0800000000000001}, {327.380859375, 16.800000000000001}} 
2017-03-07 17:18:41.108 CoreTextDemo[69713:2887064] line 1 rect {{0, -4.0800000000000001}, {327.380859375, 16.800000000000001}} 
2017-03-07 17:18:41.109 CoreTextDemo[69713:2887064] line 2 rect {{0, -4.0800000000000001}, {327.380859375, 16.800000000000001}} 
2017-03-07 17:18:41.109 CoreTextDemo[69713:2887064] line 3 rect {{0, -4.0800000000000001}, {327.380859375, 16.800000000000001}} 
2017-03-07 17:18:41.109 CoreTextDemo[69713:2887064] line 4 rect {{0, -4.0800000000000001}, {327.380859375, 16.800000000000001}} 
2017-03-07 17:18:41.109 CoreTextDemo[69713:2887064] line 5 rect {{0.345703125, -1.3200000000000001}, {326.98828125, 11.244}} 
2017-03-07 17:18:41.110 CoreTextDemo[69713:2887064] line 6 rect {{0.345703125, -1.3200000000000001}, {326.98828125, 11.244}}

效果图：

​ image

从结果可以看出来：

1.0 、 kCTLineBoundsExcludeTypographicLeading 和kCTLineBoundsExcludeTypographicShifts 结果相同 都是计算的是 line 的印刷边界。
2.而 kCTLineBoundsUseHangingPunctuation 和 kCTLineBoundsUseGlyphPathBounds 结果相同。 kCTLineBoundsUseHangingPunctuation 这个计算结果包含结尾的标点符号 。kCTLineBoundsUseGlyphPathBounds 而用字符的path 而不是边界
3.kCTLineBoundsUseOpticalBounds 和 kCTLineBoundsIncludeLanguageExtents
4.这些属性直接可以 与 操作 eg: CGRect rect = CTLineGetBoundsWithOptions(line,kCTLineBoundsExcludeTypographicLeading|kCTLineBoundsUseHangingPunctuation); 具体组合结果 可自行研究。

CTLineGetTrailingWhitespaceWidth

获取结尾的宽度

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
    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富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok"];
    
    CTParagraphStyleSetting setting[1] ;
    CGFloat vale =30;
    setting[0].spec = kCTParagraphStyleSpecifierMinimumLineSpacing;
    setting[0].valueSize =sizeof(CGFloat);
    setting[0].value = &vale;
    CTParagraphStyleRef stlye = CTParagraphStyleCreate(setting, 1);
    NSMutableDictionary * dic1 = [NSMutableDictionary dictionaryWithObject:(__bridge id)stlye forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [mabstring setAttributes:dic1 range:NSMakeRange(0, mabstring.length)];
    
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(0 , 0 ,self.bounds.size.width , self.bounds.size.height-60));
    
    NSMutableDictionary * Framedic = [NSMutableDictionary dictionary];
    
    [Framedic setObject:@(kCTFrameProgressionTopToBottom) forKey:(__bridge NSString *)kCTFrameProgressionAttributeName];
    [Framedic setObject:@(kCTFramePathFillEvenOdd) forKey:(__bridge NSString *)kCTFramePathFillRuleAttributeName];
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, (__bridge CFDictionaryRef) Framedic);
    
    CGRect rectBoud = CGPathGetBoundingBox(Path);
    CFRange fitRange = CFRangeMake(0, 0);
    
    
    CGSize size =CTFramesetterSuggestFrameSizeWithConstraints(framesetter, range, (__bridge CFDictionaryRef) Framedic, rectBoud.size, &fitRange);
    CTFrameDraw(frame,context);
    NSArray * array = (__bridge NSArray * )CTFrameGetLines(frame);
    
    for (int i=0; i<array.count; i++) {
        CTLineRef line = (__bridge CTLineRef)(array[i]);
      double whiteSpace =  CTLineGetTrailingWhitespaceWidth(line);
        NSLog(@"line white space %lf",whiteSpace);
    }
 
 结果 
 2017-03-07 17:32:23.263 CoreTextDemo[69799:2901252] line white space 13.335938
2017-03-07 17:32:23.264 CoreTextDemo[69799:2901252] line white space 0.000000
2017-03-07 17:32:23.264 CoreTextDemo[69799:2901252] line white space 0.000000
2017-03-07 17:32:23.264 CoreTextDemo[69799:2901252] line white space 0.000000
2017-03-07 17:32:23.264 CoreTextDemo[69799:2901252] line white space 0.000000

CTLineGetImageBounds

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
    CGContextRef context = UIGraphicsGetCurrentContext();
    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富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok富文本学习/慢慢来吧。不是一朝一夕之功。ok  ok ok"];
    
    CTParagraphStyleSetting setting[1] ;
    CGFloat vale =30;
    setting[0].spec = kCTParagraphStyleSpecifierMinimumLineSpacing;
    setting[0].valueSize =sizeof(CGFloat);
    setting[0].value = &vale;
    CTParagraphStyleRef stlye = CTParagraphStyleCreate(setting, 1);
    NSMutableDictionary * dic1 = [NSMutableDictionary dictionaryWithObject:(__bridge id)stlye forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    [mabstring setAttributes:dic1 range:NSMakeRange(0, mabstring.length)];
    
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(0 , 0 ,self.bounds.size.width , self.bounds.size.height-60));
    
    NSMutableDictionary * Framedic = [NSMutableDictionary dictionary];
    
    [Framedic setObject:@(kCTFrameProgressionTopToBottom) forKey:(__bridge NSString *)kCTFrameProgressionAttributeName];
    [Framedic setObject:@(kCTFramePathFillEvenOdd) forKey:(__bridge NSString *)kCTFramePathFillRuleAttributeName];
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, (__bridge CFDictionaryRef) Framedic);
    
    CGRect rectBoud = CGPathGetBoundingBox(Path);
    CFRange fitRange = CFRangeMake(0, 0);
    
    
    CGSize size =CTFramesetterSuggestFrameSizeWithConstraints(framesetter, range, (__bridge CFDictionaryRef) Framedic, rectBoud.size, &fitRange);
    NSArray * array = (__bridge NSArray * )CTFrameGetLines(frame);
    
    for (int i=0; i<array.count; i++) {
        CTLineRef line = (__bridge CTLineRef)(array[i]);
      CGRect  imageRect =  CTLineGetImageBounds(line,context);
        NSLog(@"line image rect %@",NSStringFromCGRect(imageRect));
    }
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    CTFrameDraw(frame,context);
    
 结果：
 2017-03-07 17:38:46.496 CoreTextDemo[69839:2906671] line image rect {{0.94800000000000006, -1.3200000000000001}, {243.01293749999999, 11.244}}
2017-03-07 17:38:46.497 CoreTextDemo[69839:2906671] line image rect {{3.6796875, -1.3200000000000001}, {371.314453125, 11.244}}
2017-03-07 17:38:46.497 CoreTextDemo[69839:2906671] line image rect {{0.52800000000000002, -1.3200000000000001}, {362.15742187500001, 11.244}}
2017-03-07 17:38:46.497 CoreTextDemo[69839:2906671] line image rect {{0.59999999999999998, -1.3200000000000001}, {355.32942187499998, 11.244}}
2017-03-07 17:38:46.499 CoreTextDemo[69839:2906671] line image rect {{0.345703125, -1.3200000000000001}, {326.98828125, 11.244}}

看的出来 是绘制的最小尺寸。要是排版line 不太好用

赏

您的赏赐是我不断更新的动力

微信

扫一扫，分享到微信

微信分享二维码

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