//插入话题 -(void)insertTopic:(NSString )strDescription eventId:(NSNumber)eId { NSInteger tmpWordCount = _maxWord-_textView.text.length; if (strDescription.length > tmpWordCount) { return; } LJTextViewBinding *topicBinding = [[LJTextViewBinding alloc]initWithTopicName:strDescription topicId:eId]; NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.lineSpacing = textlineSpacing;// 字体的行间距 NSAttributedString *topicAttributedString = [[NSAttributedString alloc] initWithString:strDescription attributes: @{NSForegroundColorAttributeName : UIColorFromRGB(0x0bbe06),NSFontAttributeName : [UIFont systemFontOfSize:16], NSParagraphStyleAttributeName : paragraphStyle,LJTextBindingAttributeName:topicBinding}];

NSRange selectedRange = self.textView.selectedRange; NSRange rangeTopic = NSMakeRange(selectedRange.location,strDescription.length); NSMutableAttributedString *attributedString = self.textView.attributedText.mutableCopy;

if (self.isUserPutIn)//如果用户输入#号，然后选择话题列表，先要删除前面的#号 { [attributedString deleteCharactersInRange:NSMakeRange(selectedRange.location-1, 1)]; selectedRange = NSMakeRange(selectedRange.location-1, selectedRange.length); rangeTopic = NSMakeRange(rangeTopic.location-1,strDescription.length); self.isUserPutIn = NO; } // 插入到当前选中位置. [attributedString replaceCharactersInRange:selectedRange withAttributedString:topicAttributedString];

// 设置富文本会导致 textView 的 font 变为另一种富文本默认字体,因此需要专门指定字体为原先字体. [attributedString addAttribute:NSFontAttributeName value:FONT(16) range:(NSRange){0,attributedString.length}];

self.textView.attributedText = attributedString; self.textView.selectedRange = NSMakeRange(selectedRange.location+strDescription.length, 0); [_textView setTypingAttributes:textAttrDict]; [self textViewDidChange:_textView]; }

//得到用户输入的话题数组

• (NSArray *)getTopicRangeArray:(NSAttributedString *)attributedString { NSAttributedString *traveAStr = attributedString ?: _textView.attributedText; __block NSMutableArray *rangeArray = [NSMutableArray array];

  [[self topicExpression] enumerateMatchesInString:traveAStr.string options:0 range:NSMakeRange(0, traveAStr.string.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) { NSRange resultRange = result.range; NSDictionary *attributedDict = [traveAStr attributesAtIndex:resultRange.location effectiveRange:NULL]; if (attributedDict[QYPPTextBindingAttributeName]) { LJTextViewBinding *binding = attributedDict[QYPPTextBindingAttributeName]; binding.rangePosition = NSStringFromRange(resultRange); if (binding) { [rangeArray addObject:binding]; }

                              }
                          }];
  

  return rangeArray;

作者：陆号 链接：https://www.jianshu.com/p/9e43b4cbc117 來源：简书 简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。