Question

Consider this:

NSString *whatever=[NSString stringWithFormat:@"My float: %.2f",aFloat];

This will round my aFloat to 2 decimal places when building the string whatever

Suppose I want the 2 in this statement to be assignable, such that, based on the value of aFloat I might have it show 2 or 4 decimal places. How can I build this into stringWithFormat?

I want to be able to do this without an if that simply repeats the entire line for different cases, but rather somehow dynamically change just the %.2f portion.

Answer 1

You will need to build the format first:

NSInteger precision = 2;
NSString *format = [@"My float: %." stringByAppendingFormat:@"%d", precision];
format = [format stringByAppendingString:@"f"];

NSString *whatever=[NSString stringWithFormat:format, aFloat];