NSAttributedString

Question

我有一个 html 内容想在 UILabel 上显示。

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，因此上述方法保留了属性字符串 LTR。尽管使用此代码：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

Answer 1

希望对您右侧对齐有帮助！！

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;

Answer 2

问题是关于文本方向的，但回答是关于对齐的。奇怪...

最近遇到了同样的问题，来自 html 的属性字符串的语言方向不正确。已修复 html 属性 dir="rtl".

参见：https://www.w3schools.com/tags/att_global_dir.asp

Answer 3

Swift @BuLB JoBs 回答的版本：

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))

NSAttributedString - 为阿拉伯语添加书写方向

NSAttributedString - add writing direction for Arabic Language

objective-c

right-to-left

ios

nsmutableattributedstring