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Editorial Team
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Asked: 2026-06-10T04:27:29+00:00

I have a method that scans a string, converting any new lines to <br>

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I have a method that scans a string, converting any new lines to <br> for HTML. The line in question is:

NSCharacterSet *newLineCharacters = [NSCharacterSet characterSetWithCharactersInString:
          [NSString stringWithFormat:@"\n\r%C%C%C%C", 0x0085, 0x000C, 0x2028, 0x2029]];

Xcode gives me a warning here:

Format specifies type 'unsigned short' but the argument has type 'int'

It’s recommending that I change all %C to %d, however that turns out to break the function. What is the correct way to do this, and why is Xcode recommending the wrong thing?

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1 Answer

  1. Editorial Team

    One option is to cast your arguments to unsigned short: i.e. (unsigned short)0x0085 etc

    But if you’re looking for newlines, you should just use the newline character set. This is “Unicode compliant”:[ NSCharacterSet newlineCharacterSet ]

    edit

    Revisiting this question: If you are trying to separate an NSString/CFString by line breaks, you should probably use -[ NSString getLineStart:end:contentsEnd:forRange:].

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