'NSRangeException', 原因：'*** -[NSBigMutableString characterAtIndex:]: 索引 1258 越界；字符串长度 1176'

Question

NSString *htmlString = [NSString stringWithFormat:@"<html> <head><style type=\"text/css\">body {         font-family: Mehr Nastaliq Web; font-size: 22pt; white-space: pre-wrap;  text-align: right;  lang: ar; direction: RTL; -webkit-user-select: none; }</style>     </head><body leftmargin=\"20\" topmargin=\"0\" rightmargin=\"20\" > %@  </body></html>",str];
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding]  options: @{ NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType }  documentAttributes: nil error: nil];
self.txtView.attributedText=attributedString;

Answer 1

能否请您在下面尝试一下，请尝试一下，让我知道它是否有效。

NSAttributedString * attributedString = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUTF8StringEncoding]
                                                                       options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType}
                                                            documentAttributes:nil
                                                                         error:nil];

如果您不确定正确的编码，您应该使用 NSUTF8StringEncoding

更新

NSString *htmlString = @"<html><head><style type=\"text/css\">body { font-family: Mehr Nastaliq Web; font-size: 22pt; white-space: pre-wrap; text-align: right; lang: en; direction: RTL; -webkit-user-select: none; meta charset=\"UTF-8\" }</style> </head><body leftmargin=\"20\" topmargin=\"0\" rightmargin=\"20\"> مُدّعا عَنقا ہے اپنے عالَمِ تقریر کا میری تقریر کا مفہوم چونکہ عنقا یعنی معدوم ہے اور معدوم </body></html>";
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding]  options: @{ NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType }  documentAttributes: nil error: nil];
_txtView.attributedText = attributedString;

它与 NSUnicodeStringEncoding 完美配合。

Answer 2

我也看到了崩溃，即使是在最基本的示例中也是如此。在为 UICollectionView 创建 UICollectionViewCells 时，我能够跟踪它的执行情况。当我把它拉出来并且运行在更新列表之前，它工作正常......完全相同的代码。

iOS 中似乎有一个与此相关的错误，至少在 UICollectionViewDataSource:collectionView:cellForItemAtIndexPath:

中调用时是这样的

Answer 3

需要在Option dict中添加字符编码，与字符串编码相同。除此以外。这将是不可读的代码。

NSAttributedString.DocumentReadingOptionKey.characterEncoding:String.Encoding.utf8.rawValue

整个代码是

let htmlString = """
    <html><head><style type=\"text/css\">body { font-family: Mehr Nastaliq Web; font-size: 22pt; white-space: pre-wrap; text-align: right; lang: en; direction: RTL; -webkit-user-select: none; meta charset=\"UTF-8\" }</style> </head><body leftmargin=\"20\" topmargin=\"0\" rightmargin=\"20\"> hello world! Arabic.<br/> مُدّعا عَنقا ہے اپنے عالَمِ تقریر کا میری تقریر کا مفہوم چونکہ عنقا یعنی معدوم ہے اور معدوم </body></html>
    """

    let attributedString = try? NSAttributedString(data:
        htmlString.data(using: String.Encoding.utf8)!, options: [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html, NSAttributedString.DocumentReadingOptionKey.characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
    textView.attributedText = attributedString

您也可以同时更改字符串编码和属性编码。结果也将是可读的。比如unicode。

let attributedString = try? NSAttributedString(data:
                   htmlString.data(using: String.Encoding.unicode)!, options: [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html, NSAttributedString.DocumentReadingOptionKey.characterEncoding:String.Encoding.unicode.rawValue], documentAttributes: nil)
               textView.attributedText = attributedString

'NSRangeException', 原因：'*** -[NSBigMutableString characterAtIndex:]: 索引 1258 越界；字符串长度 1176'

'NSRangeException', reason: '*** -[NSBigMutableString characterAtIndex:]: Index 1258 out of bounds; string length 1176'

objective-c

nsattributedstring

ios