objective-c NSNumberFormatter 只四舍五入到小数点后 3 位
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原文地址: http://stackoverflow.com/questions/810161/
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NSNumberFormatter only rounds to 3 decimal places
提问by ChadK
I'm trying to use NSNumberFormatterto round a number to 5 decimal places in an iPhone app, but [formatter stringFromNumber:]always returns strings rounded to 0.001 (3 decimal places). What am I doing wrong?
我试图NSNumberFormatter在 iPhone 应用程序中使用将数字四舍五入到小数点后 5 位，但[formatter stringFromNumber:]总是返回四舍五入到 0.001（小数点后 3 位）的字符串。我究竟做错了什么？
formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setRoundingMode:NSNumberFormatterRoundHalfUp];
[formatter setSecondaryGroupingSize:3];
[formatter setRoundingIncrement:[NSNumber numberWithDouble:0.00001]];
回答by Nathan Kinsinger
Try -setMaximumFractionDigits:and -setMinimumFractionDigits:
尝试-setMaximumFractionDigits:和-setMinimumFractionDigits:
These configure the number of digits after the decimal separator.
这些配置小数点分隔符后的位数。
回答by smorgan
Try [formatter setFormat:@"0.00000"]; instead of setRoundingIncrement:.
试试 [格式化程序 setFormat:@"0.00000"]; 而不是 setRoundingIncrement:。
