Question

我有一个NSString，其编号为0.871，我试图将其转换为如此显示87.1％

我尝试使用NSNumberFormatter来获得该结果，但我不能让它显示3位数。实现这一结果的最佳方法是什么？感谢。

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterPercentStyle];
NSNumber *number = [formatter numberFromString:inputString];
[formatter release];

Answer 1

NSString * str = @"0.863";
NSString * newStr = [NSString stringWithFormat:@"%.1f%%", [str floatValue]*100];

Answer 2

如果您尝试将字符串转换为数字，请格式化数字：

NSDecimalNumber *number = [NSDecimalNumber decimalNumberWithString:inputString];

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterPercentStyle];
NSString *formattedString = [formatter stringFromNumber:number];
[formatter release];

如果您只想将“0.871”变成数字87.1：

NSDecimalNumber *number = [NSDecimalNumber decimalNumberWithString:inputString];
NSDecimalNumber *percentNumber = [number decimalNumberByMultiplyingByPowerOf10:2];

Answer 3

只需使用setMinimumFractionDigits：

NSNumber *myNumber = [NSNumber numberWithFloat:0.871];

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterPercentStyle];
[formatter setMinimumFractionDigits:1];

NSLog(@"%@", [formatter stringFromNumber:myNumber]);     // 87.1%

这也确保了对语言环境适当格式化百分比。

如何将NSString编号转换为3位数百分比值？

3 个答案: