Objective c 需要帮助舍入数字(浮动)
在下面的代码中,我希望满足Objective c 需要帮助舍入数字(浮动),objective-c,ios,cocoa-touch,floating-point,rounding,Objective C,Ios,Cocoa Touch,Floating Point,Rounding,在下面的代码中,我希望满足if(isKgs)的数字四舍五入到一个小数点 例如,现在它给了我2.2643534543,但我只想要2.3 有什么想法吗 NSNumber *weightInPounds = [self.pickerArray objectAtIndex:row]; NSNumber *weightInKilos = [[DDUnitConverter massUnitConverter] convertNumber: weightInPounds fromUnit: DDMassUn
if(isKgs)
的数字四舍五入到一个小数点
例如,现在它给了我2.2643534543
,但我只想要2.3
有什么想法吗
NSNumber *weightInPounds = [self.pickerArray objectAtIndex:row];
NSNumber *weightInKilos = [[DDUnitConverter massUnitConverter] convertNumber: weightInPounds fromUnit: DDMassUnitUSPounds toUnit: DDMassUnitKilograms];
NSString *temp = [NSString stringWithFormat:@"%@ kgs", [weightInKilos stringValue]];
[self.firstComponentText setString:temp];
我相信,选择器中的数字类型是
float
。您可以使用NSNumberFormatter
对象格式化NSNumber
对象。例如,
NSNumber * decimal = [NSNumber numberWithFloat:2.2643534543];
NSNumberFormatter * formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setRoundingMode:NSNumberFormatterRoundHalfUp];
[formatter setMaximumFractionDigits:1];
NSLog(@"%@", [formatter stringFromNumber:decimal]);
@费萨尔帮了忙吗?你需要进一步的帮助吗?