NSMutableAttributedString *attributedString = [[[NSMutableAttributedString alloc] initWithString:@"测试富文本显示"] autorelease];
//为所有文本设置字体
[attributedString addAttribute:NSFontAttributeName value:[NSFont systemFontOfSize:24] range:NSMakeRange(0, [attributedString length])];
//将“测试”两字字体颜色设置为蓝色
[attributedString addAttribute:NSForegroundColorAttributeName value:[NSColor blueColor] range:NSMakeRange(0, 2)];
//将“富文本”三个字字体颜色设置为红色
[attributedString addAttribute:NSForegroundColorAttributeName value:[NSColor redColor] range:NSMakeRange(2, 3)];//在“测”和“试”两字之间插入一张图片
NSString *imageName = @"taobao.png";
NSFileWrapper *imageFileWrapper = [[[NSFileWrapper alloc] initRegularFileWithContents:[[NSImage imageNamed:imageName] TIFFRepresentation]] autorelease];
imageFileWrapper.filename = imageName;
imageFileWrapper.preferredFilename = imageName;NSTextAttachment *imageAttachment = [[[NSTextAttachment alloc] initWithFileWrapper:imageFileWrapper] autorelease];
NSAttributedString *imageAttributedString = [NSAttributedString attributedStringWithAttachment:imageAttachment];
[attributedString insertAttributedString:imageAttributedString atIndex:1];/*
其实插入图片附件之后 attributedString的长度增加了1 变成了8，所以可以预见其实图片附件属性对应的内容应该是一个长度的字符
Printing description of attributedString:
测{    NSColor = "NSCalibratedRGBColorSpace 0 0 1 1";
    NSFont = "\"LucidaGrande 24.00 pt. P [] (0x10051bfd0) fobj=0x101e687f0, spc=7.59\"";
}{    NSAttachment = "<NSTextAttachment: 0x101e0c9c0> \"taobao.png\"";
}试{    NSColor = "NSCalibratedRGBColorSpace 0 0 1 1";
    NSFont = "\"LucidaGrande 24.00 pt. P [] (0x10051bfd0) fobj=0x101e687f0, spc=7.59\"";
}富文本{    NSColor = "NSCalibratedRGBColorSpace 1 0 0 1";
    NSFont = "\"LucidaGrande 24.00 pt. P [] (0x10051bfd0) fobj=0x101e687f0, spc=7.59\"";
}显示{    NSFont = "\"LucidaGrande 24.00 pt. P [] (0x10051bfd0) fobj=0x101e687f0, spc=7.59\"";
}
*/[_textView insertText:attributedString];

void RunDelegateDeallocCallback( void* refCon ){}CGFloat RunDelegateGetAscentCallback( void *refCon ){NSString *imageName = (NSString *)refCon;return [UIImage imageNamed:imageName].size.height;
}CGFloat RunDelegateGetDescentCallback(void *refCon){return 0;
}CGFloat RunDelegateGetWidthCallback(void *refCon){NSString *imageName = (NSString *)refCon;return [UIImage imageNamed:imageName].size.width;
}- (void)drawRect:(CGRect)rect
{CGContextRef context = UIGraphicsGetCurrentContext();//这四行代码只是简单测试drawRect中context的坐标系CGContextSetRGBFillColor (context, 1, 0, 0, 1);CGContextFillRect (context, CGRectMake (0, 200, 200, 100 ));CGContextSetRGBFillColor (context, 0, 0, 1, .5);CGContextFillRect (context, CGRectMake (0, 200, 100, 200));CGContextSetTextMatrix(context, CGAffineTransformIdentity);//设置字形变换矩阵为CGAffineTransformIdentity，也就是说每一个字形都不做图形变换CGAffineTransform flipVertical = CGAffineTransformMake(1,0,0,-1,0,self.bounds.size.height);CGContextConcatCTM(context, flipVertical);//将当前context的坐标系进行flipNSMutableAttributedString *attributedString = [[[NSMutableAttributedString alloc] initWithString:@"测试富文本显示"] autorelease];//为所有文本设置字体//[attributedString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:24] range:NSMakeRange(0, [attributedString length])]; // 6.0+UIFont *font = [UIFont systemFontOfSize:24];CTFontRef fontRef = CTFontCreateWithName((CFStringRef)font.fontName, font.pointSize, NULL);[attributedString addAttribute:(NSString *)kCTFontAttributeName value:(id)fontRef range:NSMakeRange(0, [attributedString length])];//将“测试”两字字体颜色设置为蓝色//[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0, 2)]; //6.0+[attributedString addAttribute:(NSString *)kCTForegroundColorAttributeName value:(id)[UIColor blueColor].CGColor range:NSMakeRange(0, 2)];//将“富文本”三个字字体颜色设置为红色//[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(2, 3)]; //6.0+[attributedString addAttribute:(NSString *)kCTForegroundColorAttributeName value:(id)[UIColor redColor].CGColor range:NSMakeRange(2, 3)];//为图片设置CTRunDelegate,delegate决定留给图片的空间大小NSString *taobaoImageName = @"taobao.png";CTRunDelegateCallbacks imageCallbacks;imageCallbacks.version = kCTRunDelegateVersion1;imageCallbacks.dealloc = RunDelegateDeallocCallback;imageCallbacks.getAscent = RunDelegateGetAscentCallback;imageCallbacks.getDescent = RunDelegateGetDescentCallback;imageCallbacks.getWidth = RunDelegateGetWidthCallback;CTRunDelegateRef runDelegate = CTRunDelegateCreate(&imageCallbacks, taobaoImageName);NSMutableAttributedString *imageAttributedString = [[NSMutableAttributedString alloc] initWithString:@" "];//空格用于给图片留位置[imageAttributedString addAttribute:(NSString *)kCTRunDelegateAttributeName value:(id)runDelegate range:NSMakeRange(0, 1)];CFRelease(runDelegate);[imageAttributedString addAttribute:@"imageName" value:taobaoImageName range:NSMakeRange(0, 1)];[attributedString insertAttributedString:imageAttributedString atIndex:1];CTFramesetterRef ctFramesetter = CTFramesetterCreateWithAttributedString((CFMutableAttributedStringRef)attributedString);CGMutablePathRef path = CGPathCreateMutable();CGRect bounds = CGRectMake(0.0, 0.0, self.bounds.size.width, self.bounds.size.height);CGPathAddRect(path, NULL, bounds);CTFrameRef ctFrame = CTFramesetterCreateFrame(ctFramesetter,CFRangeMake(0, 0), path, NULL);CTFrameDraw(ctFrame, context);CFArrayRef lines = CTFrameGetLines(ctFrame);CGPoint lineOrigins[CFArrayGetCount(lines)];CTFrameGetLineOrigins(ctFrame, CFRangeMake(0, 0), lineOrigins);for (int i = 0; i < CFArrayGetCount(lines); i++) {CTLineRef line = CFArrayGetValueAtIndex(lines, i);CGFloat lineAscent;CGFloat lineDescent;CGFloat lineLeading;CTLineGetTypographicBounds(line, &lineAscent, &lineDescent, &lineLeading);CFArrayRef runs = CTLineGetGlyphRuns(line);for (int j = 0; j < CFArrayGetCount(runs); j++) {CGFloat runAscent;CGFloat runDescent;CGPoint lineOrigin = lineOrigins[i];CTRunRef run = CFArrayGetValueAtIndex(runs, j);NSDictionary* attributes = (NSDictionary*)CTRunGetAttributes(run);CGRect runRect;runRect.size.width = CTRunGetTypographicBounds(run, CFRangeMake(0,0), &runAscent, &runDescent, NULL);runRect=CGRectMake(lineOrigin.x + CTLineGetOffsetForStringIndex(line, CTRunGetStringRange(run).location, NULL), lineOrigin.y - runDescent, runRect.size.width, runAscent + runDescent);NSString *imageName = [attributes objectForKey:@"imageName"];//图片渲染逻辑if (imageName) {UIImage *image = [UIImage imageNamed:imageName];if (image) {CGRect imageDrawRect;imageDrawRect.size = image.size;imageDrawRect.origin.x = runRect.origin.x + lineOrigin.x;imageDrawRect.origin.y = lineOrigin.y;CGContextDrawImage(context, imageDrawRect, image.CGImage);}}}}CFRelease(ctFrame);CFRelease(path);CFRelease(ctFramesetter);
}