How to format double value into string with 2 decimal places after dot and with separators of thousands?

问题

I have a double value in Objective-C and I need to place its value into label. How should I format it into string with 2 decimal places after dot and with separators of thousands?

回答1:

Use NSNumberFormatter, for example:

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setPositiveFormat:@"#,##0.00" ];

NSString *string = [formatter stringFromNumber:[ NSNumber numberWithDouble:1234567.8901 ] ];
// string is now "1,234,567.89"
[formatter release];

来源：https://stackoverflow.com/questions/7058600/how-to-format-double-value-into-string-with-2-decimal-places-after-dot-and-with