使用UITextView实现图文混排

   <p>使用UITextView实现超链接，与自定义表情皮配，还能加载自定义大小的本地图片与网络图片。</p>    <p>用的是系统UITextView控件的linkTextAttributes和attributedText属性实现了此功能，相关API须在>=7.0的系统上运行。由于实现了在文本里加载网络图片，所以导入了SDWebImage第三方文件，若不需要可以删除LXTextView.h文件里的相关代码（#import "UIImageView+WebCache.h"以及- (void)downloadImageWithUrl:(NSString *)urlString withIndex:(NSInteger)index）。</p>    <p>效果图如下：</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/c57122cc852775b18876b849b14b4e32.png"></p>    <p style="text-align:center">screen.png</p>    <h3>注意：</h3>    <ul>     <li>效果图上匹配了一些错误的网址，那没关系，正则表达式不够严谨，这也可以满足一般需求了。</li>     <li>链接需要深按才有效，系统的原因。</li>    </ul>    <p>使用方法非常简单，集成代码如下：</p>    <pre>  <code class="language-objectivec">LXTextView *textView = [[LXTextView alloc] initWithFrame:CGRectMake(10, 10, kScreenWidth - 20, kScreenHeight - 20)];      textView.delegate = self;      textView.editable = NO; // 非编辑状态下才可以点击Url]      textView.fontFloat = 18.;      textView.textString = @"Thiswww.hiphotos.baidu.comis ancel超链接ofa bri_StringWith Attachment:textAttachment]indfdxcsehttps://www.baidu.comrtAttribu tedStriUse [傲慢]this method to release shared invali dateexwwwwssdvdv.hiphotos.baidu.dsccomamptimers, and [吓]isa覆盖核 http://c.hip[大哭]hotos.baidu.com设施nexstore enough application state information[微笑] to re https://c.hiphotos.baidu.cnstore your";      [self.view addSubview:textView];</code></pre>    <p>核心代码如下：</p>    <pre>  <code class="language-objectivec">- (void)setTextString:(NSString *)string  {      NSDictionary *attributeDict =          [NSDictionary dictionaryWithObjectsAndKeys:           [UIFont systemFontOfSize:self.fontFloat], NSFontAttributeName,           [UIColor blackColor], NSForegroundColorAttributeName,nil];        attributedString = [[NSMutableAttributedString alloc] initWithString:string attributes:attributeDict];        //设置行距与换行模式      NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];      paragraphStyle.lineSpacing = 5.0;      paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;      [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, string.length)];        NSArray *emojiArr = [LXHelpClass validateEmojiOfText:attributedString.string];      for (int i = 0; i < emojiArr.count; i++) {          NSInteger index = [helpClass.keyArr indexOfObject:emojiArr[i]];          NSString *imgName = [helpClass.valueArr objectAtIndex:index];          NSRange range = [attributedString.string rangeOfString:emojiArr[i] options:NSCaseInsensitiveSearch range:NSMakeRange(0, attributedString.string.length)];            //正则表达式匹配的表情          LXTextAttachment *textAttachmentEmoji = [[LXTextAttachment alloc] initWithData:nil ofType:nil];          textAttachmentEmoji.imgSize = CGSizeMake(30 ,30);          textAttachmentEmoji.image = [UIImage imageNamed:imgName] ;          NSAttributedString *textAttachmentString = [NSAttributedString attributedStringWithAttachment:textAttachmentEmoji];          [attributedString replaceCharactersInRange:range withAttributedString:textAttachmentString];      }        //自定义添加的本地图片      LXTextAttachment *textAttachmentImg = [[LXTextAttachment alloc] initWithData:nil ofType:nil];      textAttachmentImg.imgSize = CGSizeMake(270, 160);      textAttachmentImg.image = [UIImage imageNamed:@"bird"];      NSAttributedString *textAttachmentString2 = [NSAttributedString attributedStringWithAttachment:textAttachmentImg];      [attributedString insertAttributedString:textAttachmentString2 atIndex:56];        NSArray *linkArr = [LXHelpClass validateLinkOfText:attributedString.string];      for (int i = 0; i < linkArr.count; i++) {          NSRange range = NSRangeFromString(linkArr[i]);          //正则表达式匹配的链接          NSString *linkStr = [attributedString.string substringWithRange:range];          [attributedString addAttribute:NSLinkAttributeName value:linkStr range:range];      }        //自定义的链接      [attributedString addAttribute:NSLinkAttributeName value:@"http://baidu.com" range:[[attributedString string] rangeOfString:@"超链接"]];        NSDictionary *linkAttributes =      @{NSForegroundColorAttributeName:[UIColor greenColor], NSUnderlineColorAttributeName:[UIColor lightGrayColor], NSUnderlineStyleAttributeName:@(NSUnderlinePatternSolid)};        self.linkTextAttributes = linkAttributes;      self.attributedText = attributedString;  }</code></pre>    <h3> </h3>    <p> </p>    <p> </p>