How to display accented characters using NSMutableAttributedString?

Question

In my NSString , I've some accented characters and html tags, such as <i></i> . I want to display them in NSTextField with text attributes to them.

When I build the attrStr, I use:

NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithHTML:[text dataUsingEncoding:NSUTF8StringEncoding]
                                                                   options:@{NSWebPreferencesDocumentOption : webPreferences}
                                                        documentAttributes:NULL];

I display the text as follow:

someTextField.attributedStringValue = attrStr;

But this require I know the encoding of the NSString , but the problem is that I do not know the encoding. So how do I build an attribute string without knowing the encoding?

Answer 1

You don't need to know the encoding of your NSString – it is an Objective-C string. The definition of dataUsingEncoding: states, emphasis added:

Returns an NSData object containing a representation of the receiver encoded using a given encoding .

This method converts from whatever encoding NSString uses internally into the specified encoding – so the result is your case is an NSData containing the bytes of a UTF8 string.

If you are seeing invalid results maybe the issue is when you create the original NSString ?

HTH

Addendum I now see you asked this question first (I added an answer – basically you need to know or guess). Why are you reading the file into an NSString in the first place? Just read it directly into an NSData and then let the HTML parser sort it out (it will either read the HTML encoding tag or default to an encoding).

Answer 2

最终，我发现如果在上面使用NSUnicodeStringEncoding ，则重音字符将正确显示。