cocoa - NSAttributedString initWithHTML 字符编码不正确？

Question

-[NSMutableAttributedString initWithHTML:documentAttributes:] 似乎破坏了特殊字符:

NSString *html = @"“Hello” World"; // notice the smart quotes
NSData *htmlData = [html dataUsingEncoding:NSUTF8StringEncoding];
NSMutableAttributedString *as = [[NSMutableAttributedString alloc] initWithHTML:htmlData documentAttributes:nil];
NSLog(@"%@", as);

打印“Hello”World，后跟一些RTF命令。在我的应用程序中，我将属性字符串转换为 RTF 并将其显示在 NSTextView 中，但其中的字符也被损坏。

根据文档，默认编码是UTF-8，但我尝试明确，结果是相同的:

NSDictionary *attributes = @{NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding]};
NSMutableAttributedString *as = [[NSMutableAttributedString alloc] initWithHTML:htmlData documentAttributes:&attributes];

Answer 1

创建 NSData 时使用 [html dataUsingEncoding:NSUnicodeStringEncoding]，并在将 HTML 解析为属性字符串时设置匹配的编码选项:

NSCharacterEncodingDocumentAttribute 的文档有点令人困惑:

NSNumber, containing an int specifying the NSStringEncoding for the file; for reading and writing plain text files and writing HTML; default for plain text is the default encoding; default for HTML is UTF-8.

所以，你的代码应该是:

NSString *html = @"“Hello” World";
NSData *htmlData = [html dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *options = @{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                                    NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)};
NSMutableAttributedString *as =
    [[NSMutableAttributedString alloc] initWithHTML:htmlData
                                            options: options
                                 documentAttributes:nil];