NSString with wrong characters when using UTF-8

Question

I get data from a UTF-8 encoded XML file, and I want to display every element in a UITableView . I want my cells to have the same size and display the 2 first text lines with the most data possible so I tried to remove the carriage returns.

In my cellForRow method I changed this :

[[myCell textLabel] setText:data];

By :

[[myCell textLabel] setText:[self correctData:data]];

Here is my correctData method :

- (NSString *) correctData : (NSString *) str
{
    NSMutableString *res = [NSMutableString stringWithFormat:@""];
    for(int i = 0 ; i < [str length] ; i++)
    {
        char car = [str characterAtIndex:i];
        if(car != 10 && car != 13) 
           [res appendString:[NSString stringWithFormat:@"%c",car]];
    }
    return res;
}

And this correctly removes the carriage returns, but it also alters the UTF-8 chars. For example, a bit of the initial string (str) :

Diplômé(e) d'Etat

And with this function it becomes :

DiplÙmÈ(e) d'Etat

What should I do ? Thanks.

Nicolas Bachschmidt · Accepted Answer · 2012-06-06 13:09:09Z

4

NSString works with unichar characters that are stored on 16bits whereas char is only 8bits long. Converting an unichar to a char will alter all characters with a code point above U+00FF.

You can solve this issue by replacing char with unichar and %c with %C.

Edit: But that's not really efficient. You may better use regular expressions to replace all newline characters in once:

str = [str stringByReplacingOccurrencesOfString:@"[\r\n]+"
                                     withString:@""
                                        options:NSRegularExpressionSearch
                                           range:NSMakeRange(0, str.length)];

edited Jun 6, 2012 at 13:09

answered Jun 6, 2012 at 12:49

Nicolas Bachschmidt

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1 Comment

Rob Over a year ago

Amazing, that was so easy. Thanks a lot !

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