iOS中属性字符串转换成字符串_ios开发把nsattributedstring转换成string-优快云博客

本文介绍了一种将含有图片附件的NSAttributedString转换为纯文本的方法，并提供了两种实现方式。这两种方法都能够有效地处理NSAttributedString中的图片附件，将其替换为特定的占位符，并生成对应的URL字符串。

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//将属性字符串转换成字符串  以下方法中提供两种方法，根据需求选取
- (NSString *)textString
{
    
    /*
     * 第一种方法：
     */
    NSAttributedString *attStr = _messageInputView.attributedText;
    
    NSMutableAttributedString *resutlAtt = [[NSMutableAttributedString alloc] initWithAttributedString:attStr];
    
    __block NSUInteger index = 1;
    __weak __typeof(self) weakSelf = self;
    //枚举出所有的附件字符串
     __block NSUInteger base = 0;
    
    [attStr enumerateAttribute:NSAttachmentAttributeName inRange:NSMakeRange(0, attStr.length)
                     options:0
                  usingBlock:^(id value, NSRange range, BOOL *stop) {
                      if (value && [value isKindOfClass:[ImageTextAttachment class]]) {
                           NSString *p = [NSString stringWithFormat:@"{{p%lu}}", (unsigned long)index];
                          [resutlAtt replaceCharactersInRange:NSMakeRange(range.location + base, range.length)
                                                     withString:p];
                          if ([weakSelf.url isEqualToString:@""] || weakSelf.url == nil) {
                              
                              weakSelf.url = [NSString stringWithFormat:@"%@=%@", p, _imgUrlArray[index - 1]];
                          } else {
                              weakSelf.url = [NSString stringWithFormat:@"%@,%@=%@", weakSelf.url, p, _imgUrlArray[index - 1]];
                              
                          }
                          
                          base += p.length - 1;
                          index++;
                      }
                  }];

         /*
     * 第二种方法：
     */

// [attStr enumerateAttributesInRange:NSMakeRange(0, attStr.length) options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired usingBlock:^(NSDictionary *attrs, NSRange range, BOOL *stop) {// // //NSTextAttachment value类型 key-NSAttachment 从字典中取得那一个图片// //获取当前替换字符串的长度// __block NSUInteger base = 0;// NSTextAttachment *textAtt = attrs[@"NSAttachment"];// if (textAtt)// {// NSString *p = [NSString stringWithFormat:@"{{p%lu}}", (unsigned long)index];// [resutlAtt replaceCharactersInRange:NSMakeRange(range.location + base, range.length)// withString:p];// if ([weakSelf.url isEqualToString:@""] || weakSelf.url == nil) {// // weakSelf.url = [NSString stringWithFormat:@"%@=%@", p, _imgUrlArray[index]];// } else {// weakSelf.url = [NSString stringWithFormat:@"%@,%@=%@", weakSelf.url, p, _imgUrlArray[index]];// // }// // base += p.length;// index++;// // }// // }]; DLog(@"---resutlAtt.string----- %@", resutlAtt.string) return resutlAtt.string;