We can use -initWithData:options:documentAttributes:error: create an HTML based string. 利用 -initWithData:options:documentAttributes:error: 建立 HTML 語法為基礎的 attributed string.

HTML Attributed string

NSString *origin = @"<b><i>hello world</i></b>";
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:[origin dataUsingEncoding:NSUnicodeStringEncoding allowLossyConversion:YES]
                                                                            options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType}
                                                                 documentAttributes:nil
                                                                              error:nil];
_label.attributedText = attributedString;