更改NSTextAttachment图像的大小？

Question

我使用以下代码将RSS提要的原始HTML格式化为NSAttributedString.HTML包含的<img>标签可以将图像作为附件附加NSTextAttachment到NSAttributedString.问题是图像对于放置属性字符串的UITextView来说太大了.有没有办法可以在属性字符串中操纵图像的大小？以下是代表图像附件的整个属性字符串的摘录.

{
    NSAttachment = "<NSTextAttachment: 0x16d29450> \"e0e1d483a922419807a2378a7ec031af.jpg\"";
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x16ef8a40> font-family: \"Times New Roman\"; font-weight: normal; font-style: normal; font-size: 12.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 12, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (null), Lists (null), BaseWritingDirection 0, HyphenationFactor 0, TighteningFactor 0, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
}

Answer 1

您可以迭代NSAttributedString,获取附件,边界并修改它们:

[myAtrrString enumerateAttribute:NSAttachmentAttributeName inRange:NSMakeRange(0, myAtrrString.length) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
   if (![value isKindOfClass:[NSTextAttachment class]]) {
      return;
   }
   NSTextAttachment *attachment = (NSTextAttachment*)value;
    CGRect bounds = attachment.bounds;
   // modify bounds
   attachment.bounds = bounds;
}];