Ios NSAttributedString-添加阿拉伯语的书写方向

我想在UILabel上显示一个html内容

NSAttributedString *attrStr = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUnicodeStringEncoding] options:@{ 
NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType} 
documentAttributes:nil error:nil];
return attrStr;

这适用于英语（LTR语义），但由于我也想支持阿拉伯语，上述方法保留了属性字符串LTR。 尽管使用了此代码：

self.view.semanticContentAttribute=UISemanticContentAttributeForceRightToLeft

我试过了

NSMutableAttributedString *mutableAttributedString = [[NSMutableAttributedString alloc]initWithData:[htmlString dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType} documentAttributes:nil error:nil];
[mutableAttributedString addAttribute:NSWritingDirectionAttributeName value:@[@(NSWritingDirectionRightToLeft | NSWritingDirectionOverride)] range:NSMakeRange(0, string.length)];
return mutableAttributedString;

还是一样。欢迎提出任何建议。
谢谢
希望对您右侧校准有所帮助

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
paragraphStyle.alignment = NSTextAlignmentRight;

NSDictionary *attr = @{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                   NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)};

NSError *error = nil;

NSMutableAttributedString *attributedText =
[[NSMutableAttributedString alloc]initWithData:[text dataUsingEncoding:NSUTF8StringEncoding] options:attr documentAttributes:nil error:&error];

[attributedText addAttribute:NSParagraphStyleAttributeName
                   value:paragraphStyle
                   range:NSMakeRange(0, attributedText.length)];
return attributedText;

问题是关于文本方向，但答案是关于对齐的。奇怪

最近也遇到了同样的问题，当html属性字符串的语言方向不正确时。修复了html属性
dir=“rtl”

参见：
Swift版本@bull JoBs的答案：

let yourHTMLString = "" // your string
let options: [NSAttributedString.DocumentReadingOptionKey : Any] = [
    .documentType: NSAttributedString.DocumentType.html,
    .characterEncoding: NSNumber(value: String.Encoding.utf8.rawValue)
]
guard let data = yourHTMLString.data(using: .utf8) else { return }
var attributedText: NSMutableAttributedString!
do {
    attributedText = try NSMutableAttributedString(data: data, options: options, documentAttributes: nil)
} catch { return }

// This attribute fixes the alignment problem for Arabic language
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineBreakMode = .byWordWrapping
paragraphStyle.alignment = .right
attributedText.addAttribute(NSAttributedString.Key.paragraphStyle, value: paragraphStyle, range: NSMakeRange(0, attributedText.length))