Question

我知道这个问题与Konstantin Heinrich here报告的问题几乎相同，但由于没有给出令人满意的解决方案，我认为我会再次提出这个问题。

我基本上尝试将一些丰富的格式应用于标准UITextView中的文字，将其转换为HTML，将其转换回NSAttributedString并再次在UITextView中显示。您可以在下面找到我用来转换NSAttributedString的方法。

- (NSString *)htmlStringFromAttributedString:(NSAttributedString *)attributedString {
    NSError *error;
    NSData *htmlData = [attributedString dataFromRange:NSMakeRange(0, attributedString.length)
                                    documentAttributes:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType}
                                                 error:&error];

    if (error) {
        NSLog(@"%@", error);
        return nil;
    }

    NSString *htmlString = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding];
    return htmlString;
}

- (NSAttributedString *)attributedStringFromHTMLString:(NSString *)htmlString {
    NSError *error;
    NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUTF8StringEncoding]
                                                                            options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType}
                                                                 documentAttributes:nil
                                                                              error:&error];

    if (error) {
        NSLog(@"%@", error);
        return nil;
    }

    return attributedString;
}

现在一切顺利，但从HTML字符串生成的NSAttributedString的字体大小比原始字体大。如果我使用RTF而不是HTML（即只是将NSHTMLTextDocumentType替换为NSRTFTextDocumentType），一切都会按预期工作，如屏幕截图所示。

说实话，我很想相信我们正在查看Foundation框架中的错误。特别是给出了从HTML生成的NSAttributedString的控制台输出。看看最后一块属性（甚至不再影响任何文本的属性）如何包含正确的字体大小？

Some {
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x7fdde3919b70> font-family: \"Avenir-Light\"; font-weight: normal; font-style: normal; font-size: 20.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 28/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
}simple{
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x7fdde39172f0> font-family: \"Avenir-Heavy\"; font-weight: bold; font-style: normal; font-size: 20.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 28/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
} text {
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x7fdde3919b70> font-family: \"Avenir-Light\"; font-weight: normal; font-style: normal; font-size: 20.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 28/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
}with{
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x7fdde3919b70> font-family: \"Avenir-Light\"; font-weight: normal; font-style: normal; font-size: 20.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 28/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
    NSUnderline = 1;
} {
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x7fdde3919b70> font-family: \"Avenir-Light\"; font-weight: normal; font-style: normal; font-size: 20.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 28/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
}formatting{
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x7fdde1f43a20> font-family: \"Avenir-HeavyOblique\"; font-weight: bold; font-style: italic; font-size: 20.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 28/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
}.{
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x7fdde3919b70> font-family: \"Avenir-Light\"; font-weight: normal; font-style: normal; font-size: 20.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 28/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
}
{
    NSColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSFont = "<UICTFont: 0x7fdde1f75740> font-family: \"Avenir-Book\"; font-weight: normal; font-style: normal; font-size: 15.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 21/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "UIDeviceRGBColorSpace 0 0 0 1";
    NSStrokeWidth = 0;
}

错误与否，是否有人知道如何克服这个问题？最好不必手动重置结果字符串中的字体大小，如顶部引用的问题所示？任何帮助将不胜感激。

将NSAttributedString转换为HTML并再次返回的问题

0 个答案: