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POHow do I force a sign-character on the output of an NSNumberFormatter
 

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    <p>I want to use a number formatter to generate my output, so the number is automatically formatted for the user's locale, but I want it to work like <strong>"%+.1f"</strong> does in <em>printf()</em>, that is always have a sign specified. </p> <pre><code>NSNumberFormatter *nf = [[NSNumberFormatter alloc] init]; nf.numberStyle = NSNumberFormatterDecimalStyle; nf.maximumFractionDigits = 1; double val = 3.1234; label.text = [NSString stringWithFormat: @"XXX %@ XXX", [nf stringFromNumber: [NSNumber numberWithDouble: val]]]; </code></pre> <p>I want the label to come out "XXX +3.1 XXX" in the US and the appropriate but equivalent string for any other location. The only things I can find are <code>setPositiveFormat:</code> and <code>setPositivePrefix:</code>.</p> <p>But I <em>don't</em> want to set the format since I don't know how to format numbers in other countries; I don't know if a plus-sign is used to designate a positive number in Arabic or Russian or some culture I have not thought of. I do know, for example, that decimal points, commas, spaces, etc., all have different meanings in European countries compared to the U.S. - Could the same be true for +/- signs?</p> <p>What I do currently is:</p> <pre><code>label.text = [NSString stringWithFormat: @"XXX %s%@ XXX", (val &lt; 0) ? "" : "+", [nf stringFromNumber: [NSNumber numberWithDouble: val]]]; </code></pre> <p>But this presumes that '+' and '-' are correct for all formats.</p> <p>I'm sure it must be there since it is a standard formatting thing that has been in <em>printf()</em> since the dark ages...</p>
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