iOS解析数字字符串会转变成科学计数法问题

 

//使用此方法转换即可

 

- (NSString *)formartScientificNotationWithString:(NSString *)str{

    long double num = [[NSString stringWithFormat:@"%@",str] floatValue];

    NSNumberFormatter * formatter = [[NSNumberFormatter alloc]init];

    formatter.numberStyle = kCFNumberFormatterNoStyle;

    NSString * string = [formatter stringFromNumber:[NSNumber numberWithDouble:num]];

    return [NSString calculateFormat:string];

}