I am writing a debugging application, and want to display numbers in an appropriate hex format (32 or 64-bits) in an NSTextField.

However, the NSNumberFormatter is missing the hex option!

What is the best way to achieve this result?

At the moment, I have a special accessor for each value, e.g.:

-(NSNumber*)value { return value; }

-(NSString*)valueAsHex { return [ NSString stringWithFormat:@”0x%08x”, [ NSNumber unsignedIntValue ] ]; }

but this feels wrong, since it essentially modifies the model to get a UI result.

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You are free to derive your own NSFormatter(s).