// // M80AttributedLabel.m // M80AttributedLabel // // Created by amao on 13-9-1. // Copyright (c) 2013年 www.xiangwangfeng.com. All rights reserved. // #import "M80AttributedLabel.h" #import "M80AttributedLabelAttachment.h" #import "M80AttributedLabelURL.h" static NSString* const M80EllipsesCharacter = @"\u2026"; static dispatch_queue_t m80_attributed_label_parse_queue; static dispatch_queue_t get_m80_attributed_label_parse_queue() \ { if (m80_attributed_label_parse_queue == NULL) { m80_attributed_label_parse_queue = dispatch_queue_create("com.m80.parse_queue", 0); } return m80_attributed_label_parse_queue; } @interface M80AttributedLabel () { NSMutableArray *_attachments; NSMutableArray *_linkLocations; CTFrameRef _textFrame; CGFloat _fontAscent; CGFloat _fontDescent; CGFloat _fontHeight; } @property (nonatomic,strong) NSMutableAttributedString *attributedString; @property (nonatomic,strong) M80AttributedLabelURL *touchedLink; @property (nonatomic,assign) BOOL linkDetected; @property (nonatomic,assign) BOOL ignoreRedraw; @end @implementation M80AttributedLabel - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { [self commonInit]; } return self; } - (id)initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; if (self) { [self commonInit]; } return self; } - (void)dealloc { if (_textFrame) { CFRelease(_textFrame); } } #pragma mark - 初始化 - (void)commonInit { _attributedString = [[NSMutableAttributedString alloc]init]; _attachments = [[NSMutableArray alloc]init]; _linkLocations = [[NSMutableArray alloc]init]; _textFrame = nil; _linkColor = [UIColor blueColor]; _font = [UIFont systemFontOfSize:15]; _textColor = [UIColor blackColor]; _highlightColor = [UIColor colorWithRed:0xd7/255.0 green:0xf2/255.0 blue:0xff/255.0 alpha:1]; _lineBreakMode = kCTLineBreakByWordWrapping; _underLineForLink = YES; _autoDetectLinks = YES; _lineSpacing = 0.0; _paragraphSpacing = 0.0; if (self.backgroundColor == nil) { self.backgroundColor = [UIColor whiteColor]; } self.userInteractionEnabled = YES; [self resetFont]; } - (void)cleanAll { _ignoreRedraw = NO; _linkDetected = NO; [_attachments removeAllObjects]; [_linkLocations removeAllObjects]; self.touchedLink = nil; for (UIView *subView in self.subviews) { [subView removeFromSuperview]; } [self resetTextFrame]; } - (void)resetTextFrame { if (_textFrame) { CFRelease(_textFrame); _textFrame = nil; } if ([NSThread isMainThread] && !_ignoreRedraw) { [self setNeedsDisplay]; } } - (void)resetFont { CTFontRef fontRef = CTFontCreateWithName((CFStringRef)self.font.fontName, self.font.pointSize, NULL); if (fontRef) { _fontAscent = CTFontGetAscent(fontRef); _fontDescent = CTFontGetDescent(fontRef); _fontHeight = CTFontGetSize(fontRef); CFRelease(fontRef); } } #pragma mark - 属性设置 //保证正常绘制，如果传入nil就直接不处理 - (void)setFont:(UIFont *)font { if (font && _font != font) { _font = font; [_attributedString m80_setFont:_font]; [self resetFont]; for (M80AttributedLabelAttachment *attachment in _attachments) { attachment.fontAscent = _fontAscent; attachment.fontDescent = _fontDescent; } [self resetTextFrame]; } } - (void)setTextColor:(UIColor *)textColor { if (textColor && _textColor != textColor) { _textColor = textColor; [_attributedString m80_setTextColor:textColor]; [self resetTextFrame]; } } - (void)setHighlightColor:(UIColor *)highlightColor { if (highlightColor && _highlightColor != highlightColor) { _highlightColor = highlightColor; [self resetTextFrame]; } } - (void)setLinkColor:(UIColor *)linkColor { if (_linkColor != linkColor) { _linkColor = linkColor; [self resetTextFrame]; } } - (void)setFrame:(CGRect)frame { CGRect oldRect = self.bounds; [super setFrame:frame]; if (!CGRectEqualToRect(self.bounds, oldRect)) { [self resetTextFrame]; } } - (void)setBounds:(CGRect)bounds { CGRect oldRect = self.bounds; [super setBounds:bounds]; if (!CGRectEqualToRect(self.bounds, oldRect)) { [self resetTextFrame]; } } - (void)setShadowColor:(UIColor *)shadowColor { if (_shadowColor != shadowColor) { _shadowColor = shadowColor; [self resetTextFrame]; } } - (void)setShadowOffset:(CGSize)shadowOffset { if (!CGSizeEqualToSize(_shadowOffset, shadowOffset)) { _shadowOffset = shadowOffset; [self resetTextFrame]; } } - (void)setShadowBlur:(CGFloat)shadowBlur { if (_shadowBlur != shadowBlur) { _shadowBlur = shadowBlur; [self resetTextFrame]; } } #pragma mark - 辅助方法 - (NSAttributedString *)attributedString:(NSString *)text { if ([text length]) { NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:text]; [string m80_setFont:self.font]; [string m80_setTextColor:self.textColor]; return string; } else { return [[NSAttributedString alloc] init]; } } - (NSInteger)numberOfDisplayedLines { CFArrayRef lines = CTFrameGetLines(_textFrame); return _numberOfLines > 0 ? MIN(CFArrayGetCount(lines), _numberOfLines) : CFArrayGetCount(lines); } - (NSAttributedString *)attributedStringForDraw { if (_attributedString) { //添加排版格式 NSMutableAttributedString *drawString = [_attributedString mutableCopy]; //如果LineBreakMode为TranncateTail,那么默认排版模式改成kCTLineBreakByCharWrapping,使得尽可能地显示所有文字 CTLineBreakMode lineBreakMode = self.lineBreakMode; if (self.lineBreakMode == kCTLineBreakByTruncatingTail) { lineBreakMode = _numberOfLines == 1 ? kCTLineBreakByTruncatingTail : kCTLineBreakByWordWrapping; } CGFloat fontLineHeight = self.font.lineHeight; //使用全局fontHeight作为最小lineHeight CTParagraphStyleSetting settings[] = { {kCTParagraphStyleSpecifierAlignment,sizeof(_textAlignment),&_textAlignment}, {kCTParagraphStyleSpecifierLineBreakMode,sizeof(lineBreakMode),&lineBreakMode}, {kCTParagraphStyleSpecifierMaximumLineSpacing,sizeof(_lineSpacing),&_lineSpacing}, {kCTParagraphStyleSpecifierMinimumLineSpacing,sizeof(_lineSpacing),&_lineSpacing}, {kCTParagraphStyleSpecifierParagraphSpacing,sizeof(_paragraphSpacing),&_paragraphSpacing}, {kCTParagraphStyleSpecifierMinimumLineHeight,sizeof(fontLineHeight),&fontLineHeight}, }; CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings,sizeof(settings) / sizeof(settings[0])); [drawString addAttribute:(id)kCTParagraphStyleAttributeName value:(__bridge id)paragraphStyle range:NSMakeRange(0, [drawString length])]; CFRelease(paragraphStyle); for (M80AttributedLabelURL *url in _linkLocations) { if (url.range.location + url.range.length >[_attributedString length]) { continue; } UIColor *drawLinkColor = url.color ? : self.linkColor; [drawString m80_setTextColor:drawLinkColor range:url.range]; [drawString m80_setUnderlineStyle:_underLineForLink ? kCTUnderlineStyleSingle : kCTUnderlineStyleNone modifier:kCTUnderlinePatternSolid range:url.range]; } return drawString; } else { return nil; } } - (M80AttributedLabelURL *)urlForPoint:(CGPoint)point { static const CGFloat kVMargin = 5; if (!CGRectContainsPoint(CGRectInset(self.bounds, 0, -kVMargin), point) || _textFrame == nil) { return nil; } CFArrayRef lines = CTFrameGetLines(_textFrame); if (!lines) return nil; CFIndex count = CFArrayGetCount(lines); CGPoint origins[count]; CTFrameGetLineOrigins(_textFrame, CFRangeMake(0,0), origins); CGAffineTransform transform = [self transformForCoreText]; CGFloat verticalOffset = 0; //不像Nimbus一样设置文字的对齐方式，都统一是TOP,那么offset就为0 for (int i = 0; i < count; i++) { CGPoint linePoint = origins[i]; CTLineRef line = CFArrayGetValueAtIndex(lines, i); CGRect flippedRect = [self getLineBounds:line point:linePoint]; CGRect rect = CGRectApplyAffineTransform(flippedRect, transform); rect = CGRectInset(rect, 0, -kVMargin); rect = CGRectOffset(rect, 0, verticalOffset); if (CGRectContainsPoint(rect, point)) { CGPoint relativePoint = CGPointMake(point.x-CGRectGetMinX(rect), point.y-CGRectGetMinY(rect)); CFIndex idx = CTLineGetStringIndexForPosition(line, relativePoint); M80AttributedLabelURL *url = [self linkAtIndex:idx]; if (url) { return url; } } } return nil; } - (id)linkDataForPoint:(CGPoint)point { M80AttributedLabelURL *url = [self urlForPoint:point]; return url ? url.linkData : nil; } - (CGAffineTransform)transformForCoreText { return CGAffineTransformScale(CGAffineTransformMakeTranslation(0, self.bounds.size.height), 1.f, -1.f); } - (CGRect)getLineBounds:(CTLineRef)line point:(CGPoint) point { CGFloat ascent = 0.0f; CGFloat descent = 0.0f; CGFloat leading = 0.0f; CGFloat width = (CGFloat)CTLineGetTypographicBounds(line, &ascent, &descent, &leading); CGFloat height = ascent + descent; return CGRectMake(point.x, point.y - descent, width, height); } - (M80AttributedLabelURL *)linkAtIndex:(CFIndex)index { for (M80AttributedLabelURL *url in _linkLocations) { if (NSLocationInRange(index, url.range)) { return url; } } return nil; } - (CGRect)rectForRange:(NSRange)range inLine:(CTLineRef)line lineOrigin:(CGPoint)lineOrigin { CGRect rectForRange = CGRectZero; CFArrayRef runs = CTLineGetGlyphRuns(line); CFIndex runCount = CFArrayGetCount(runs); // Iterate through each of the "runs" (i.e. a chunk of text) and find the runs that // intersect with the range. for (CFIndex k = 0; k < runCount; k++) { CTRunRef run = CFArrayGetValueAtIndex(runs, k); CFRange stringRunRange = CTRunGetStringRange(run); NSRange lineRunRange = NSMakeRange(stringRunRange.location, stringRunRange.length); NSRange intersectedRunRange = NSIntersectionRange(lineRunRange, range); if (intersectedRunRange.length == 0) { // This run doesn't intersect the range, so skip it. continue; } CGFloat ascent = 0.0f; CGFloat descent = 0.0f; CGFloat leading = 0.0f; // Use of 'leading' doesn't properly highlight Japanese-character link. CGFloat width = (CGFloat)CTRunGetTypographicBounds(run, CFRangeMake(0, 0), &ascent, &descent, NULL); //&leading); CGFloat height = ascent + descent; CGFloat xOffset = CTLineGetOffsetForStringIndex(line, CTRunGetStringRange(run).location, nil); CGRect linkRect = CGRectMake(lineOrigin.x + xOffset - leading, lineOrigin.y - descent, width + leading, height); linkRect.origin.y = roundf(linkRect.origin.y); linkRect.origin.x = roundf(linkRect.origin.x); linkRect.size.width = roundf(linkRect.size.width); linkRect.size.height = roundf(linkRect.size.height); rectForRange = CGRectIsEmpty(rectForRange) ? linkRect : CGRectUnion(rectForRange, linkRect); } return rectForRange; } - (void)appendAttachment:(M80AttributedLabelAttachment *)attachment { attachment.fontAscent = _fontAscent; attachment.fontDescent = _fontDescent; unichar objectReplacementChar = 0xFFFC; NSString *objectReplacementString = [NSString stringWithCharacters:&objectReplacementChar length:1]; NSMutableAttributedString *attachText = [[NSMutableAttributedString alloc]initWithString:objectReplacementString]; CTRunDelegateCallbacks callbacks; callbacks.version = kCTRunDelegateVersion1; callbacks.getAscent = ascentCallback; callbacks.getDescent = descentCallback; callbacks.getWidth = widthCallback; callbacks.dealloc = deallocCallback; CTRunDelegateRef delegate = CTRunDelegateCreate(&callbacks, (void *)attachment); NSDictionary *attr = [NSDictionary dictionaryWithObjectsAndKeys:(__bridge id)delegate,kCTRunDelegateAttributeName, nil]; [attachText setAttributes:attr range:NSMakeRange(0, 1)]; CFRelease(delegate); [_attachments addObject:attachment]; [self appendAttributedText:attachText]; } #pragma mark - 设置文本 - (void)setText:(NSString *)text { NSAttributedString *attributedText = [self attributedString:text]; [self setAttributedText:attributedText]; } - (void)setAttributedText:(NSAttributedString *)attributedText { _attributedString = [[NSMutableAttributedString alloc]initWithAttributedString:attributedText]; [self cleanAll]; } - (NSString *)text { return [_attributedString string]; } - (NSAttributedString *)attributedText { return [_attributedString copy]; } #pragma mark - 添加文本 - (void)appendText:(NSString *)text { NSAttributedString *attributedText = [self attributedString:text]; [self appendAttributedText:attributedText]; } - (void)appendAttributedText:(NSAttributedString *)attributedText { [_attributedString appendAttributedString:attributedText]; [self resetTextFrame]; } #pragma mark - 添加图片 - (void)appendImage:(UIImage *)image { [self appendImage:image maxSize:image.size]; } - (void)appendImage:(UIImage *)image maxSize:(CGSize)maxSize { [self appendImage:image maxSize:maxSize margin:UIEdgeInsetsZero]; } - (void)appendImage:(UIImage *)image maxSize:(CGSize)maxSize margin:(UIEdgeInsets)margin { [self appendImage:image maxSize:maxSize margin:margin alignment:M80ImageAlignmentBottom]; } - (void)appendImage:(UIImage *)image maxSize:(CGSize)maxSize margin:(UIEdgeInsets)margin alignment:(M80ImageAlignment)alignment { M80AttributedLabelAttachment *attachment = [M80AttributedLabelAttachment attachmentWith:image margin:margin alignment:alignment maxSize:maxSize]; [self appendAttachment:attachment]; } #pragma mark - 添加UI控件 - (void)appendView:(UIView *)view { [self appendView:view margin:UIEdgeInsetsZero]; } - (void)appendView:(UIView *)view margin:(UIEdgeInsets)margin { [self appendView:view margin:margin alignment:M80ImageAlignmentBottom]; } - (void)appendView:(UIView *)view margin:(UIEdgeInsets)margin alignment:(M80ImageAlignment)alignment { M80AttributedLabelAttachment *attachment = [M80AttributedLabelAttachment attachmentWith:view margin:margin alignment:alignment maxSize:CGSizeZero]; [self appendAttachment:attachment]; } #pragma mark - 添加链接 - (void)addCustomLink:(id)linkData forRange:(NSRange)range { [self addCustomLink:linkData forRange:range linkColor:self.linkColor]; } - (void)addCustomLink:(id)linkData forRange:(NSRange)range linkColor:(UIColor *)color { M80AttributedLabelURL *url = [M80AttributedLabelURL urlWithLinkData:linkData range:range color:color]; [_linkLocations addObject:url]; [self resetTextFrame]; } #pragma mark - 计算大小 - (CGSize)sizeThatFits:(CGSize)size { NSAttributedString *drawString = [self attributedStringForDraw]; if (drawString == nil) { return CGSizeZero; } CFAttributedStringRef attributedStringRef = (__bridge CFAttributedStringRef)drawString; CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(attributedStringRef); CFRange range = CFRangeMake(0, 0); if (_numberOfLines > 0 && framesetter) { CGMutablePathRef path = CGPathCreateMutable(); CGPathAddRect(path, NULL, CGRectMake(0, 0, size.width, size.height)); CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL); CFArrayRef lines = CTFrameGetLines(frame); if (nil != lines && CFArrayGetCount(lines) > 0) { NSInteger lastVisibleLineIndex = MIN(_numberOfLines, CFArrayGetCount(lines)) - 1; CTLineRef lastVisibleLine = CFArrayGetValueAtIndex(lines, lastVisibleLineIndex); CFRange rangeToLayout = CTLineGetStringRange(lastVisibleLine); range = CFRangeMake(0, rangeToLayout.location + rangeToLayout.length); } CFRelease(frame); CFRelease(path); } CFRange fitCFRange = CFRangeMake(0, 0); CGSize newSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, range, NULL, size, &fitCFRange); if (framesetter) { CFRelease(framesetter); } //hack: //1.需要加上额外的一部分size,有些情况下计算出来的像素点并不是那么精准 //2.iOS7 的 CTFramesetterSuggestFrameSizeWithConstraint s方法比较残,需要多加一部分 height //3.iOS7 多行中如果首行带有很多空格，会导致返回的 suggestionWidth 远小于真实 width ,那么多行情况下就是用传入的 width if (newSize.height < _fontHeight * 2) //单行 { return CGSizeMake(ceilf(newSize.width) + 2.0, ceilf(newSize.height) + 4.0); } else { return CGSizeMake(size.width, ceilf(newSize.height) + 4.0); } } - (CGSize)intrinsicContentSize { return [self sizeThatFits:CGSizeMake(CGRectGetWidth(self.bounds), CGFLOAT_MAX)]; } #pragma mark - 绘制方法 - (void)drawRect:(CGRect)rect { CGContextRef ctx = UIGraphicsGetCurrentContext(); if (ctx == nil) { return; } CGContextSaveGState(ctx); CGAffineTransform transform = [self transformForCoreText]; CGContextConcatCTM(ctx, transform); [self recomputeLinksIfNeeded]; NSAttributedString *drawString = [self attributedStringForDraw]; if (drawString) { [self prepareTextFrame:drawString rect:rect]; [self drawHighlightWithRect:rect]; [self drawAttachments]; [self drawShadow:ctx]; [self drawText:drawString rect:rect context:ctx]; } CGContextRestoreGState(ctx); } - (void)prepareTextFrame:(NSAttributedString *)string rect:(CGRect)rect { if (_textFrame == nil) { CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)string); CGMutablePathRef path = CGPathCreateMutable(); CGPathAddRect(path, nil,rect); _textFrame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL); CGPathRelease(path); CFRelease(framesetter); } } - (void)drawHighlightWithRect:(CGRect)rect { if (self.touchedLink && self.highlightColor) { [self.highlightColor setFill]; NSRange linkRange = self.touchedLink.range; CFArrayRef lines = CTFrameGetLines(_textFrame); CFIndex count = CFArrayGetCount(lines); CGPoint lineOrigins[count]; CTFrameGetLineOrigins(_textFrame, CFRangeMake(0, 0), lineOrigins); NSInteger numberOfLines = [self numberOfDisplayedLines]; CGContextRef ctx = UIGraphicsGetCurrentContext(); for (CFIndex i = 0; i < numberOfLines; i++) { CTLineRef line = CFArrayGetValueAtIndex(lines, i); CFRange stringRange = CTLineGetStringRange(line); NSRange lineRange = NSMakeRange(stringRange.location, stringRange.length); NSRange intersectedRange = NSIntersectionRange(lineRange, linkRange); if (intersectedRange.length == 0) { continue; } CGRect highlightRect = [self rectForRange:linkRange inLine:line lineOrigin:lineOrigins[i]]; highlightRect = CGRectOffset(highlightRect, 0, -rect.origin.y); if (!CGRectIsEmpty(highlightRect)) { CGFloat pi = (CGFloat)M_PI; CGFloat radius = 1.0f; CGContextMoveToPoint(ctx, highlightRect.origin.x, highlightRect.origin.y + radius); CGContextAddLineToPoint(ctx, highlightRect.origin.x, highlightRect.origin.y + highlightRect.size.height - radius); CGContextAddArc(ctx, highlightRect.origin.x + radius, highlightRect.origin.y + highlightRect.size.height - radius, radius, pi, pi / 2.0f, 1.0f); CGContextAddLineToPoint(ctx, highlightRect.origin.x + highlightRect.size.width - radius, highlightRect.origin.y + highlightRect.size.height); CGContextAddArc(ctx, highlightRect.origin.x + highlightRect.size.width - radius, highlightRect.origin.y + highlightRect.size.height - radius, radius, pi / 2, 0.0f, 1.0f); CGContextAddLineToPoint(ctx, highlightRect.origin.x + highlightRect.size.width, highlightRect.origin.y + radius); CGContextAddArc(ctx, highlightRect.origin.x + highlightRect.size.width - radius, highlightRect.origin.y + radius, radius, 0.0f, -pi / 2.0f, 1.0f); CGContextAddLineToPoint(ctx, highlightRect.origin.x + radius, highlightRect.origin.y); CGContextAddArc(ctx, highlightRect.origin.x + radius, highlightRect.origin.y + radius, radius, -pi / 2, pi, 1); CGContextFillPath(ctx); } } } } - (void)drawShadow:(CGContextRef)ctx { if (self.shadowColor) { CGContextSetShadowWithColor(ctx, self.shadowOffset, self.shadowBlur, self.shadowColor.CGColor); } } - (void)drawText:(NSAttributedString *)attributedString rect:(CGRect)rect context:(CGContextRef)context { if (_textFrame) { if (_numberOfLines > 0) { CFArrayRef lines = CTFrameGetLines(_textFrame); NSInteger numberOfLines = [self numberOfDisplayedLines]; CGPoint lineOrigins[numberOfLines]; CTFrameGetLineOrigins(_textFrame, CFRangeMake(0, numberOfLines), lineOrigins); for (CFIndex lineIndex = 0; lineIndex < numberOfLines; lineIndex++) { CGPoint lineOrigin = lineOrigins[lineIndex]; CGContextSetTextPosition(context, lineOrigin.x, lineOrigin.y); CTLineRef line = CFArrayGetValueAtIndex(lines, lineIndex); BOOL shouldDrawLine = YES; if (lineIndex == numberOfLines - 1 && _lineBreakMode == kCTLineBreakByTruncatingTail) { //找到最后一行并检查是否需要 truncatingTail CFRange lastLineRange = CTLineGetStringRange(line); if (lastLineRange.location + lastLineRange.length < attributedString.length) { CTLineTruncationType truncationType = kCTLineTruncationEnd; NSUInteger truncationAttributePosition = lastLineRange.location + lastLineRange.length - 1; NSDictionary *tokenAttributes = [attributedString attributesAtIndex:truncationAttributePosition effectiveRange:NULL]; NSAttributedString *tokenString = [[NSAttributedString alloc] initWithString:M80EllipsesCharacter attributes:tokenAttributes]; CTLineRef truncationToken = CTLineCreateWithAttributedString((CFAttributedStringRef)tokenString); NSMutableAttributedString *truncationString = [[attributedString attributedSubstringFromRange:NSMakeRange(lastLineRange.location, lastLineRange.length)] mutableCopy]; if (lastLineRange.length > 0) { //移除掉最后一个对象...（其实这个地方有点问题,也有可能需要移除最后 2 个对象，因为 attachment 宽度的关系） [truncationString deleteCharactersInRange:NSMakeRange(lastLineRange.length - 1, 1)]; } [truncationString appendAttributedString:tokenString]; CTLineRef truncationLine = CTLineCreateWithAttributedString((CFAttributedStringRef)truncationString); CTLineRef truncatedLine = CTLineCreateTruncatedLine(truncationLine, rect.size.width, truncationType, truncationToken); if (!truncatedLine) { truncatedLine = CFRetain(truncationToken); } CFRelease(truncationLine); CFRelease(truncationToken); CTLineDraw(truncatedLine, context); CFRelease(truncatedLine); shouldDrawLine = NO; } } if(shouldDrawLine) { CTLineDraw(line, context); } } } else { CTFrameDraw(_textFrame,context); } } } - (void)drawAttachments { if ([_attachments count] == 0) { return; } CGContextRef ctx = UIGraphicsGetCurrentContext(); if (ctx == nil) { return; } CFArrayRef lines = CTFrameGetLines(_textFrame); CFIndex lineCount = CFArrayGetCount(lines); CGPoint lineOrigins[lineCount]; CTFrameGetLineOrigins(_textFrame, CFRangeMake(0, 0), lineOrigins); NSInteger numberOfLines = [self numberOfDisplayedLines]; for (CFIndex i = 0; i < numberOfLines; i++) { CTLineRef line = CFArrayGetValueAtIndex(lines, i); CFArrayRef runs = CTLineGetGlyphRuns(line); CFIndex runCount = CFArrayGetCount(runs); CGPoint lineOrigin = lineOrigins[i]; CGFloat lineAscent; CGFloat lineDescent; CTLineGetTypographicBounds(line, &lineAscent, &lineDescent, NULL); CGFloat lineHeight = lineAscent + lineDescent; CGFloat lineBottomY = lineOrigin.y - lineDescent; //遍历以找到对应的 attachment 进行绘制 for (CFIndex k = 0; k < runCount; k++) { CTRunRef run = CFArrayGetValueAtIndex(runs, k); NSDictionary *runAttributes = (NSDictionary *)CTRunGetAttributes(run); CTRunDelegateRef delegate = (__bridge CTRunDelegateRef)[runAttributes valueForKey:(id)kCTRunDelegateAttributeName]; if (nil == delegate) { continue; } M80AttributedLabelAttachment* attributedImage = (M80AttributedLabelAttachment *)CTRunDelegateGetRefCon(delegate); CGFloat ascent = 0.0f; CGFloat descent = 0.0f; CGFloat width = (CGFloat)CTRunGetTypographicBounds(run, CFRangeMake(0, 0), &ascent, &descent, NULL); CGFloat imageBoxHeight = [attributedImage boxSize].height; CGFloat xOffset = CTLineGetOffsetForStringIndex(line, CTRunGetStringRange(run).location, nil); CGFloat imageBoxOriginY = 0.0f; switch (attributedImage.alignment) { case M80ImageAlignmentTop: imageBoxOriginY = lineBottomY + (lineHeight - imageBoxHeight); break; case M80ImageAlignmentCenter: imageBoxOriginY = lineBottomY + (lineHeight - imageBoxHeight) / 2.0; break; case M80ImageAlignmentBottom: imageBoxOriginY = lineBottomY; break; } CGRect rect = CGRectMake(lineOrigin.x + xOffset, imageBoxOriginY, width, imageBoxHeight); UIEdgeInsets flippedMargins = attributedImage.margin; CGFloat top = flippedMargins.top; flippedMargins.top = flippedMargins.bottom; flippedMargins.bottom = top; CGRect attatchmentRect = UIEdgeInsetsInsetRect(rect, flippedMargins); if (i == numberOfLines - 1 && k >= runCount - 2 && _lineBreakMode == kCTLineBreakByTruncatingTail) { //最后行最后的2个CTRun需要做额外判断 CGFloat attachmentWidth = CGRectGetWidth(attatchmentRect); const CGFloat kMinEllipsesWidth = attachmentWidth; if (CGRectGetWidth(self.bounds) - CGRectGetMinX(attatchmentRect) - attachmentWidth < kMinEllipsesWidth) { continue; } } id content = attributedImage.content; if ([content isKindOfClass:[UIImage class]]) { CGContextDrawImage(ctx, attatchmentRect, ((UIImage *)content).CGImage); } else if ([content isKindOfClass:[UIView class]]) { UIView *view = (UIView *)content; if (view.superview == nil) { [self addSubview:view]; } CGRect viewFrame = CGRectMake(attatchmentRect.origin.x, self.bounds.size.height - attatchmentRect.origin.y - attatchmentRect.size.height, attatchmentRect.size.width, attatchmentRect.size.height); [view setFrame:viewFrame]; } else { NSLog(@"Attachment Content Not Supported %@",content); } } } } #pragma mark - 点击事件处理 - (BOOL)onLabelClick:(CGPoint)point { id linkData = [self linkDataForPoint:point]; if (linkData) { if (_delegate && [_delegate respondsToSelector:@selector(m80AttributedLabel:clickedOnLink:)]) { [_delegate m80AttributedLabel:self clickedOnLink:linkData]; } else { NSURL *url = nil; if ([linkData isKindOfClass:[NSString class]]) { url = [NSURL URLWithString:linkData]; } else if([linkData isKindOfClass:[NSURL class]]) { url = linkData; } if (url) { [[UIApplication sharedApplication] openURL:url]; } } return YES; } return NO; } #pragma mark - 链接处理 - (void)recomputeLinksIfNeeded { const NSInteger kMinHttpLinkLength = 5; if (!_autoDetectLinks || _linkDetected) { return; } NSString *text = [[_attributedString string] copy]; NSUInteger length = [text length]; if (length <= kMinHttpLinkLength) { return; } BOOL sync = length <= M80MinAsyncDetectLinkLength; [self computeLink:text sync:sync]; } - (void)computeLink:(NSString *)text sync:(BOOL)sync { __weak typeof(self) weakSelf = self; typedef void (^LinkBlock) (NSArray *); LinkBlock block = ^(NSArray *links) { weakSelf.linkDetected = YES; if ([links count]) { for (M80AttributedLabelURL *link in links) { [weakSelf addAutoDetectedLink:link]; } [weakSelf resetTextFrame]; } }; if (sync) { _ignoreRedraw = YES; NSArray *links = [M80AttributedLabelURL detectLinks:text]; block(links); _ignoreRedraw = NO; } else { dispatch_async(get_m80_attributed_label_parse_queue(), ^{ NSArray *links = [M80AttributedLabelURL detectLinks:text]; dispatch_async(dispatch_get_main_queue(), ^{ NSString *plainText = [[weakSelf attributedString] string]; if ([plainText isEqualToString:text]) { block(links); } }); }); } } - (void)addAutoDetectedLink:(M80AttributedLabelURL *)link { NSRange range = link.range; for (M80AttributedLabelURL *url in _linkLocations) { if (NSIntersectionRange(range, url.range).length != 0) { return; } } [self addCustomLink:link.linkData forRange:link.range]; } #pragma mark - 点击事件相应 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { if (self.touchedLink == nil) { UITouch *touch = [touches anyObject]; CGPoint point = [touch locationInView:self]; self.touchedLink = [self urlForPoint:point]; } if (self.touchedLink) { [self setNeedsDisplay]; } else { [super touchesBegan:touches withEvent:event]; } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesMoved:touches withEvent:event]; UITouch *touch = [touches anyObject]; CGPoint point = [touch locationInView:self]; M80AttributedLabelURL *touchedLink = [self urlForPoint:point]; if (self.touchedLink != touchedLink) { self.touchedLink = touchedLink; [self setNeedsDisplay]; } } - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesCancelled:touches withEvent:event]; if (self.touchedLink) { self.touchedLink = nil; [self setNeedsDisplay]; } } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint point = [touch locationInView:self]; if(![self onLabelClick:point]) { [super touchesEnded:touches withEvent:event]; } if (self.touchedLink) { self.touchedLink = nil; [self setNeedsDisplay]; } } - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event { M80AttributedLabelURL *touchedLink = [self urlForPoint:point]; if (touchedLink == nil) { NSArray *subViews = [self subviews]; for (UIView *view in subViews) { CGPoint hitPoint = [view convertPoint:point fromView:self]; UIView *hitTestView = [view hitTest:hitPoint withEvent:event]; if (hitTestView) { return hitTestView; } } return nil; } else { return self; } } #pragma mark - 设置自定义的连接检测block + (void)setCustomDetectMethod:(M80CustomDetectLinkBlock)block { [M80AttributedLabelURL setCustomDetectMethod:block]; } @end