Let's say I have an NSNumber object that holds a value 0.12345 . All I want is an NSNumber object with a same value, but rounded to a specified number of significant digits, say 2, so value looks like this: 0.12 . I don't want to convert it to NSString and back, which is what some of the answers suggest I would prefer not to cast/convert and/or do multiplication/division manually like in this answer Is there an obvious way to do it that I am missing?

Round NSNumber to a specific number of significant digits

Let's say I have an NSNumber object that holds a value 0.12345. All I want is an NSNumber object with a same value, but rounded to a specified number of significant digits, say 2, so value looks like this: 0.12.

I don't want to convert it to NSString and back, which is what some of the answers suggest
I would prefer not to cast/convert and/or do multiplication/division manually like in this answer

Is there an obvious way to do it that I am missing?

Round NSNumber to a specific number of significant digits

2 Answers