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| - (void)drawRect:(CGRect)rect
{
[super drawRect:rect];
// 1.获取上下文
CGContextRef contextRef = UIGraphicsGetCurrentContext();
// [a,b,c,d,tx,ty]
NSLog(@"转换前的坐标：%@",NSStringFromCGAffineTransform(CGContextGetCTM(contextRef)));
// 2.转换坐标系
CGContextSetTextMatrix(contextRef, CGAffineTransformIdentity);
CGContextTranslateCTM(contextRef, 0, self.bounds.size.height);
CGContextScaleCTM(contextRef, 1.0, -1.0);
NSLog(@"转换后的坐标：%@",NSStringFromCGAffineTransform(CGContextGetCTM(contextRef)));
// 3.创建绘制区域，可以对path进行个性化裁剪以改变显示区域
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, self.bounds);
// 4.创建需要绘制的文字
NSMutableAttributedString *attributed = [[NSMutableAttributedString alloc] initWithString:@"这是我的第一个coreText demo，我是要给兵来自老白干I型那个饿哦个呢给个I类回滚igkhpwfh 评估后共和国开不开vbdkaphphohghg 的分工额好几个辽宁省更怕hi维护你不看hi好人佛【井柏然把饿哦个"];
[attributed addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:NSMakeRange(0, 5)];
// 两种方式皆可
[attributed addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(3, 10)];
[attributed addAttribute:(id)kCTForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(0, 2)];
// 设置行距等样式
CGFloat lineSpace = 10; // 行距一般取决于这个值
CGFloat lineSpaceMax = 20;
CGFloat lineSpaceMin = 2;
const CFIndex kNumberOfSettings = 3;
// 结构体数组
CTParagraphStyleSetting theSettings[kNumberOfSettings] = {
{kCTParagraphStyleSpecifierLineSpacingAdjustment,sizeof(CGFloat),&lineSpace},
{kCTParagraphStyleSpecifierMaximumLineSpacing,sizeof(CGFloat),&lineSpaceMax},
{kCTParagraphStyleSpecifierMinimumLineSpacing,sizeof(CGFloat),&lineSpaceMin}
};
CTParagraphStyleRef theParagraphRef = CTParagraphStyleCreate(theSettings, kNumberOfSettings);
// 单个元素的形式
// CTParagraphStyleSetting theSettings = {kCTParagraphStyleSpecifierLineSpacingAdjustment,sizeof(CGFloat),&lineSpace};
// CTParagraphStyleRef theParagraphRef = CTParagraphStyleCreate(&theSettings, kNumberOfSettings);
// 两种方式皆可
// [attributed addAttribute:(id)kCTParagraphStyleAttributeName value:(__bridge id)theParagraphRef range:NSMakeRange(0, attributed.length)];
// 将设置的行距应用于整段文字
[attributed addAttribute:NSParagraphStyleAttributeName value:(__bridge id)(theParagraphRef) range:NSMakeRange(0, attributed.length)];
CFRelease(theParagraphRef);
// 插入图片部分
//为图片设置CTRunDelegate,delegate决定留给图片的空间大小
NSString *weicaiImageName = @"about";
CTRunDelegateCallbacks imageCallbacks;
imageCallbacks.version = kCTRunDelegateVersion1;
imageCallbacks.dealloc = RunDelegateDeallocCallback;
imageCallbacks.getAscent = RunDelegateGetAscentCallback;
imageCallbacks.getDescent = RunDelegateGetDescentCallback;
imageCallbacks.getWidth = RunDelegateGetWidthCallback;
// ①该方式适用于图片在本地的情况
// 设置CTRun的代理
CTRunDelegateRef runDelegate = CTRunDelegateCreate(&imageCallbacks, (__bridge void *)(weicaiImageName));
NSMutableAttributedString *imageAttributedString = [[NSMutableAttributedString alloc] initWithString:@" "];//空格用于给图片留位置
[imageAttributedString addAttribute:(NSString *)kCTRunDelegateAttributeName value:(__bridge id)runDelegate range:NSMakeRange(0, 1)];
CFRelease(runDelegate);
[imageAttributedString addAttribute:@"imageName" value:weicaiImageName range:NSMakeRange(0, 1)];
// 在index处插入图片，可插入多张
[attributed insertAttributedString:imageAttributedString atIndex:5];
// [attributed insertAttributedString:imageAttributedString atIndex:10];
// ②若图片资源在网络上，则需要使用0xFFFC作为占位符
// 图片信息字典
NSString *picURL =@"http://weicai-hearsay-avatar.qiniudn.com/b4f71f05a1b7593e05e91b0175bd7c9e?imageView2/2/w/192/h/277";
NSDictionary *imgInfoDic = @{@"width":@192,@"height":@277}; // 宽高跟具体图片有关
// 设置CTRun的代理
CTRunDelegateRef delegate = CTRunDelegateCreate(&imageCallbacks, (__bridge void *)imgInfoDic);
// 使用0xFFFC作为空白的占位符
unichar objectReplacementChar = 0xFFFC;
NSString *content = [NSString stringWithCharacters:&objectReplacementChar length:1];
NSMutableAttributedString *space = [[NSMutableAttributedString alloc] initWithString:content];
CFAttributedStringSetAttribute((CFMutableAttributedStringRef)space, CFRangeMake(0, 1), kCTRunDelegateAttributeName, delegate);
CFRelease(delegate);
// 将创建的空白AttributedString插入进当前的attrString中，位置可以随便指定，不能越界
[attributed insertAttributedString:space atIndex:10];
// 5.根据NSAttributedString生成CTFramesetterRef
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attributed);
CTFrameRef ctFrame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, attributed.length), path, NULL);
// 6.绘制除图片以外的部分
CTFrameDraw(ctFrame, contextRef);
// 处理绘制图片的逻辑
CFArrayRef lines = CTFrameGetLines(ctFrame);
CGPoint lineOrigins[CFArrayGetCount(lines)];
// 把ctFrame里每一行的初始坐标写到数组里
CTFrameGetLineOrigins(ctFrame, CFRangeMake(0, 0), lineOrigins);
// 遍历CTRun找出图片所在的CTRun并进行绘制
for (int i = 0; i < CFArrayGetCount(lines); i++)
{
// 遍历每一行CTLine
CTLineRef line = CFArrayGetValueAtIndex(lines, i);
CGFloat lineAscent;
CGFloat lineDescent;
CGFloat lineLeading; // 行距
CTLineGetTypographicBounds(line, &lineAscent, &lineDescent, &lineLeading);
CFArrayRef runs = CTLineGetGlyphRuns(line);
for (int j = 0; j < CFArrayGetCount(runs); j++)
{
// 遍历每一个CTRun
CGFloat runAscent;
CGFloat runDescent;
CGPoint lineOrigin = lineOrigins[i]; // 获取该行的初始坐标
CTRunRef run = CFArrayGetValueAtIndex(runs, j); // 获取当前的CTRun
NSDictionary* attributes = (NSDictionary*)CTRunGetAttributes(run);
CGRect runRect;
runRect.size.width = CTRunGetTypographicBounds(run, CFRangeMake(0,0), &runAscent, &runDescent, NULL);
// 这一段可参考Nimbus的NIAttributedLabel
runRect = CGRectMake(lineOrigin.x + CTLineGetOffsetForStringIndex(line, CTRunGetStringRange(run).location, NULL), lineOrigin.y - runDescent, runRect.size.width, runAscent + runDescent);
NSString *imageName = [attributes objectForKey:@"imageName"];
if ([imageName isKindOfClass:[NSString class]])
{
// 绘制本地图片
UIImage *image = [UIImage imageNamed:imageName];
CGRect imageDrawRect;
imageDrawRect.size = image.size;
NSLog(@"%.2f",lineOrigin.x); // 该值是0,runRect已经计算过起始值
imageDrawRect.origin.x = runRect.origin.x;// + lineOrigin.x;
imageDrawRect.origin.y = lineOrigin.y;
CGContextDrawImage(contextRef, imageDrawRect, image.CGImage);
} else
{
imageName = nil;
CTRunDelegateRef delegate = (__bridge CTRunDelegateRef)[attributes objectForKey:(__bridge id)kCTRunDelegateAttributeName];
if (!delegate)
{
continue; // 如果是非图片的CTRun则跳过
}
// 网络图片
UIImage *image;
if (!self.image)
{
// 图片未下载完成，使用占位图片
image = [UIImage imageNamed:weicaiImageName];
// 去下载图片
[self downLoadImageWithURL:[NSURL URLWithString:picURL]];
} else
{
image = self.image;
}
// 绘制网络图片
CGRect imageDrawRect;
imageDrawRect.size = image.size;
NSLog(@"%.2f",lineOrigin.x); // 该值是0,runRect已经计算过起始值
imageDrawRect.origin.x = runRect.origin.x;// + lineOrigin.x;
imageDrawRect.origin.y = lineOrigin.y;
CGContextDrawImage(contextRef, imageDrawRect, image.CGImage);
}
}
}
CFRelease(path);
CFRelease(framesetter);
CFRelease(ctFrame);
}
|
