iOS中CoreText的学习记录(2)

来源：互联网发布：春天奏鸣曲贝多芬知乎编辑：程序博客网时间：2024/05/19 23:13

NSString *str = @"This is a test of characterAttribute. 中文字符";        NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:str];        [mabstring beginEditing];//some code[mabstring endEditing];        //CTFramesetter是CTFrame的创建工厂，NSAttributedString需要通过CTFrame绘制到界面上，得到CTFramesetter后，创建path（绘制路径），然后得到CTFrame，最后通过CTFrameDraw方法绘制到界面上    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);        CGMutablePathRef Path = CGPathCreateMutable();        CGPathAddRect(Path, NULL ,CGRectMake(10 , -20 ,self.bounds.size.width-10 , self.bounds.size.height-10));        CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), Path, NULL);                //获取当前(View)上下文以便于之后的绘画，这个是一个离屏。    CGContextRef context = UIGraphicsGetCurrentContext();    //    调整坐标系，防止文字倒立。    CGContextSetTextMatrix(context , CGAffineTransformIdentity);        //压栈，压入图形状态栈中.每个图形上下文维护一个图形状态栈，并不是所有的当前绘画环境的图形状态的元素都被保存。图形状态中不考虑当前路径，所以不保存    //保存现在得上下文图形状态。不管后续对context上绘制什么都不会影响真正得屏幕。    CGContextSaveGState(context);      //x，y轴方向移动    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);         //缩放x，y轴方向缩放，－1.0为反向1.0倍,坐标系转换,沿x轴翻转180度    CGContextScaleCTM(context, 1.0 ,-1.0);          CTFrameDraw(frame,context);        CGPathRelease(Path);          CFRelease(framesetter);

定制text

//设置字体间隔    //const CFStringRef kCTKernAttributeName;//字符间隔属性，必须是CFNumberRef对象        //设置字体间隔    long number = 10;        CFNumberRef num = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt8Type,&number);        [mabstring addAttribute:(id)kCTKernAttributeName value:(__bridge id)num range:NSMakeRange(0, 5)];                      //设置字体属性 Georgia    //const CFStringRef kCTFontAttributeName;//字体 CTFont  Default is Helvetica 12. 与UIFont的默认值不同     CTFontRef font = CTFontCreateWithName(CFSTR("Zapfino"), 40, NULL);          [mabstring addAttribute:(id)kCTFontAttributeName value:(__bridge id)font range:NSMakeRange(0, 4)];             //设置字体颜色 kCTForegroundColorAttributeName     [mabstring addAttribute:(id)kCTForegroundColorAttributeName value:(id)[UIColor yellowColor].CGColor range:NSMakeRange(0, 9)];     //设置字体颜色为前影色          CFBooleanRef flag = kCFBooleanTrue;     [mabstring addAttribute:(id)kCTForegroundColorFromContextAttributeName value:(__bridge id)flag range:NSMakeRange(5, 10)];         //设置空心字     number = 2;     CFNumberRef num2 = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt8Type,&number);          [mabstring addAttribute:(id)kCTStrokeWidthAttributeName value:(__bridge id)num2 range:NSMakeRange(0, [str length])];     //设置空心字颜色          [mabstring addAttribute:(id)kCTStrokeColorAttributeName value:(id)[UIColor greenColor].CGColor range:NSMakeRange(0, [str length])];                //设置斜体字          CTFontRef font1 = CTFontCreateWithName((CFStringRef)[UIFont italicSystemFontOfSize:20].fontName, 14, NULL);          [mabstring addAttribute:(id)kCTFontAttributeName value:(__bridge id)font1 range:NSMakeRange(0, 4)];         //下划线          [mabstring addAttribute:(id)kCTUnderlineStyleAttributeName value:(id)[NSNumber numberWithInt:kCTUnderlineStyleDouble] range:NSMakeRange(0, 4)];          //下划线颜色          [mabstring addAttribute:(id)kCTUnderlineColorAttributeName value:(id)[UIColor redColor].CGColor range:NSMakeRange(0, 4)];

同时设置多个属性

    //对同一段字体进行多属性设置        //红色    NSMutableDictionary *attributesDict = [NSMutableDictionary dictionaryWithObject:(id)[UIColor redColor].CGColor forKey:(id)kCTForegroundColorAttributeName];        //斜体    //创建字体以及字体大小    CTFontRef font = CTFontCreateWithName((CFStringRef)[UIFont italicSystemFontOfSize:20].fontName, 40, NULL);        [attributesDict setObject:(__bridge id)font forKey:(id)kCTFontAttributeName];        //下划线    [attributesDict setObject:(id)[NSNumber numberWithInt:kCTUnderlineStyleDouble] forKey:(id)kCTUnderlineStyleAttributeName];        //空心字    long number = 5;    CFNumberRef num2 = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt8Type,&number);    [attributesDict setObject:(__bridge id)num2 forKey:(id)kCTStrokeWidthAttributeName];            [mabstring addAttributes:attributesDict range:NSMakeRange(0, 4)];

添加段落属性

//段落    //line break    CTParagraphStyleSetting lineBreakMode;    CTLineBreakMode lineBreak = kCTLineBreakByCharWrapping; //换行模式    lineBreakMode.spec = kCTParagraphStyleSpecifierLineBreakMode;    lineBreakMode.value = &lineBreak;    lineBreakMode.valueSize = sizeof(CTLineBreakMode);        //行间距    CTParagraphStyleSetting LineSpacing;    CGFloat spacing = 40.0;  //指定间距    LineSpacing.spec = kCTParagraphStyleSpecifierLineSpacingAdjustment;    LineSpacing.value = &spacing;    LineSpacing.valueSize = sizeof(CGFloat);        CTParagraphStyleSetting settings[] = {lineBreakMode,LineSpacing};    CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings, 2);   //第二个参数为settings的长度    [mabstring addAttribute:(NSString *)kCTParagraphStyleAttributeName                             value:(__bridge id)paragraphStyle                             range:NSMakeRange(0, mabstring.length)];

分列

// get current context and store it's state    //创建图形上下文    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSaveGState(context);        // translate CTM for iOS    //重置位置    CGContextTranslateCTM(context, 0, self.bounds.size.height);    CGContextScaleCTM(context, 1, -1);        // generate attributed string    NSAttributedString *attrString = [[NSAttributedString alloc]initWithString:@"这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890,这是测试1234567890"];            // Draw code start -------------------------------------------------------------------------------------------------    CGRect bounds = CGRectInset(self.bounds, 25.0f, 25.0f);    float columnWidth = (bounds.size.width - 30.0f) / 2.0f;    float columnHeight = bounds.size.height;            CTFramesetterRef framesetter    = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)(attrString));    int location = 0;        // ------------- first column    CGRect firstColumnRect = CGRectMake(bounds.origin.x, bounds.origin.y, columnWidth, columnHeight);    CGMutablePathRef firstColumnPath = CGPathCreateMutable();    CGPathAddRect(firstColumnPath, NULL, firstColumnRect);        CTFrameRef firstColumnFrame =    CTFramesetterCreateFrame(framesetter, CFRangeMake(location, 0), firstColumnPath, NULL);    //计算指定frame绘制了多少字符    CFRange firstColumnStringRange = CTFrameGetVisibleStringRange(firstColumnFrame);    CTFrameDraw(firstColumnFrame, context);        // recalculate the location for next frame.    location = firstColumnStringRange.length;            // ------------- second column    CGRect secondColumnRect =    CGRectMake(bounds.origin.x + 30 + columnWidth, bounds.origin.y, columnWidth, columnHeight);    CGMutablePathRef secondColumnPath = CGPathCreateMutable();    CGPathAddRect(secondColumnPath, NULL, secondColumnRect);        CTFrameRef secondColumnFrame =    CTFramesetterCreateFrame(framesetter,                             CFRangeMake(location, 0),                             secondColumnPath, NULL);    CTFrameDraw(secondColumnFrame, context);        // release    CFRelease(firstColumnPath);    CFRelease(firstColumnFrame);    CFRelease(secondColumnPath);    CFRelease(secondColumnFrame);    CFRelease(framesetter);        // Draw code end   -------------------------------------------------------------------------------------------------        // restore current context    CGContextRestoreGState(context);

段落样式

NSMutableAttributedString * mabstring = [[NSMutableAttributedString alloc]initWithString:src];        long slen = [mabstring length];            /*     对齐属性：     kCTLeftTextAlignment = 0,                //左对齐     kCTRightTextAlignment = 1,               //右对齐     kCTCenterTextAlignment = 2,              //居中对齐     kCTJustifiedTextAlignment = 3,           //文本对齐     kCTNaturalTextAlignment = 4              //自然文本对齐     段落默认样式为     kCTNaturalTextAlignment     */        //创建文本对齐方式    CTTextAlignment alignment = kCTNaturalTextAlignment;//kCTNaturalTextAlignment;    CTParagraphStyleSetting alignmentStyle;    alignmentStyle.spec=kCTParagraphStyleSpecifierAlignment;//指定为对齐属性    alignmentStyle.valueSize=sizeof(alignment);    alignmentStyle.value=&alignment;            //首行缩进    CGFloat fristlineindent = 24.0f;    CTParagraphStyleSetting fristline;    fristline.spec = kCTParagraphStyleSpecifierFirstLineHeadIndent;    fristline.value = &fristlineindent;    fristline.valueSize = sizeof(float);        //段缩进    CGFloat headindent = 10.0f;    CTParagraphStyleSetting head;    head.spec = kCTParagraphStyleSpecifierHeadIndent;    head.value = &headindent;    head.valueSize = sizeof(float);        //段尾缩进    CGFloat tailindent = 50.0f;    CTParagraphStyleSetting tail;    tail.spec = kCTParagraphStyleSpecifierTailIndent;    tail.value = &tailindent;    tail.valueSize = sizeof(float);    //    //tab//    CTTextAlignment tabalignment = kCTJustifiedTextAlignment;//    CTTextTabRef texttab = CTTextTabCreate(tabalignment, 24, NULL);//    CTParagraphStyleSetting tab;//    tab.spec = kCTParagraphStyleSpecifierTabStops;//    tab.value = &texttab;//    tab.valueSize = sizeof(CTTextTabRef);    //tab    CTTextAlignment tabalignment = kCTJustifiedTextAlignment;    CTTextTabRef texttab = CTTextTabCreate(tabalignment, 24, NULL);    CTTextTabRef tabArray[] = {texttab};    CFArrayRef tabStops = CFArrayCreate( kCFAllocatorDefault, (const void**) tabArray, 1, &kCFTypeArrayCallBacks );    CFRelease(tabArray[0]);    CTParagraphStyleSetting tab;    tab.spec = kCTParagraphStyleSpecifierTabStops;    tab.value = &tabStops;    tab.valueSize = sizeof(CFArrayRef);            /*     换行模式：     kCTLineBreakByWordWrapping = 0,        //出现在单词边界时起作用，如果该单词不在能在一行里显示时，整体换行。此为段的默认值。     kCTLineBreakByCharWrapping = 1,        //当一行中最后一个位置的大小不能容纳一个字符时，才进行换行。     kCTLineBreakByClipping = 2,            //超出画布边缘部份将被截除。     kCTLineBreakByTruncatingHead = 3,      //截除前面部份，只保留后面一行的数据。前部份以...代替。     kCTLineBreakByTruncatingTail = 4,      //截除后面部份，只保留前面一行的数据，后部份以...代替。     kCTLineBreakByTruncatingMiddle = 5     //在一行中显示段文字的前面和后面文字，中间文字使用...代替。     */        //换行模式    CTParagraphStyleSetting lineBreakMode;    CTLineBreakMode lineBreak = kCTLineBreakByCharWrapping;//kCTLineBreakByWordWrapping;//换行模式    lineBreakMode.spec = kCTParagraphStyleSpecifierLineBreakMode;    lineBreakMode.value = &lineBreak;    lineBreakMode.valueSize = sizeof(CTLineBreakMode);        //多行高    CGFloat MutiHeight = 2.0f;    CTParagraphStyleSetting Muti;    Muti.spec = kCTParagraphStyleSpecifierLineHeightMultiple;    Muti.value = &MutiHeight;    Muti.valueSize = sizeof(float);        //最大行高    CGFloat MaxHeight = 5.0f;    CTParagraphStyleSetting Max;    Max.spec = kCTParagraphStyleSpecifierLineHeightMultiple;    Max.value = &MaxHeight;    Max.valueSize = sizeof(float);        //行距    CGFloat _linespace = 5.0f;    CTParagraphStyleSetting lineSpaceSetting;    lineSpaceSetting.spec = kCTParagraphStyleSpecifierLineSpacing;    lineSpaceSetting.value = &_linespace;    lineSpaceSetting.valueSize = sizeof(float);        //段前间隔    CGFloat paragraphspace = 5.0f;    CTParagraphStyleSetting paragraph;    paragraph.spec = kCTParagraphStyleSpecifierLineSpacing;    paragraph.value = ¶graphspace;    paragraph.valueSize = sizeof(float);        /*     kCTWritingDirectionNatural = -1,            //普通书写方向，一般习惯是从左到右写     kCTWritingDirectionLeftToRight = 0,         //从左到右写     kCTWritingDirectionRightToLeft = 1          //从右到左写     */        //书写方向    CTWritingDirection wd = kCTWritingDirectionRightToLeft;    CTParagraphStyleSetting writedic;    writedic.spec = kCTParagraphStyleSpecifierBaseWritingDirection;    writedic.value = &wd;    writedic.valueSize = sizeof(CTWritingDirection);        //组合设置    CTParagraphStyleSetting settings[] = {//        alignmentStyle,//        fristline,//        head,//        tail,//        tab,//        lineBreakMode,//        Muti,//        Max,//        lineSpaceSetting,        writedic//        indentSetting,                    };        //通过设置项产生段落样式对象    CTParagraphStyleRef style = CTParagraphStyleCreate(settings, 11);        // build attributes    NSMutableDictionary *attributes = [NSMutableDictionary dictionaryWithObject:(__bridge id)style forKey:(id)kCTParagraphStyleAttributeName ];        // set attributes to attributed string    [mabstring addAttributes:attributes range:NSMakeRange(0, slen)];

参考文章: IOS CoreText.framework --- 基本用法 study-coretext IOS CoreText.framework --- 段落样子CTParagraphStyle

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