How to control the scientifc style of NSNumberFormatter?

问题:

I'm converting a long string representing a very big or small number to a string in scientific notation. E.g. 9999999999999999999999999 to 9.999999999999999E24.

I use NSNumberFormatter.

NSNumberFormatter *ns = [[NSNumberFormatter alloc] init]; [ns setNumberStyle: NSNumberFormatterScientificStyle]; NSString *result = [ns stringFromNumber: [ns numberFromString: aBigOrSmallString]]; [ns release]; 

But how can I control the precision part? For example, from 912345678 to 9.12E8 or 9.1234E8.

回答1:

Have you checked the setMinimumFractionDigits and setMaximumFractionDigits
Reference: NSNumberFormatter Class Reference

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