将浮点值转换为NSString [英] Convert float value to NSString

问题描述

您知道如何将浮点值转换为nsstring值，因为在我的代码中出现错误.

Do you know how can i convert float value to nsstring value because with my code, there is an error.

我的代码:

- (float)percent:(float)a :(float)b{
    return a / b * 100;
}

- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObjects:(NSArray*)objects {
  // ....   

    float tx_nb_demande_portabilite = [self percent: [(NSNumber*) [stat nb_demande_portabilite] floatValue] :[(NSNumber*) [stat nb_users] floatValue]];
    NSString *tx_nb_demande_portabilite_st = [NSString stringWithFormat:@"%@", tx_nb_demande_portabilite];
//....
}

错误:

EXC_BAD ACCESS for NSString *tx_nb_demande_portabilite_st = [NSString stringWithFormat:@"%@", tx_nb_demande_portabilite];

谢谢您的帮助.

推荐答案

您需要将%f格式说明符用于浮点，而不是%@.

You need to use %f format specifier for float, not %@.

NSString *str = [NSString stringWithFormat:@"%f", myFloat];

要使用小数点后的特定位数，请使用%.nf，其中n是小数点后的位数.

To use specific number of digits after decimal use %.nf where n is number of digits after decimal point.

// 3 digits after decimal point
NSString *str = [NSString stringWithFormat:@"%.3f", myFloat];

Obj-C使用C printf样式格式.请检查 printf手册页，以获取所有其他可能的格式.

Obj-C uses C printf style formatting. Please check printf man page for all other possible formatting.

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