OC、swift数据JSON序列化后，浮点型数据丢失的问题

出现的问题：服务后端定义的数据类型为float、double时，前端进行序列化时数据精度丢失。

要么在后端处理，定义为string类型。要么在前端处理，将float、double转化为string!!

注意：在序列化前调用此方法！！

+ (NSString *)doubleConvertString:(NSString *)source

{

    NSString *targetStr = [NSString stringWithFormat:@"%@",source];

    if (source.length == 0)

    {

        return targetStr;

    }

    NSUInteger index = 0;

    NSString *p = [targetStr substringToIndex:1];

    NSString *rStr = p;

    NSString *lChar = p;

    NSString *llid = nil;

    BOOL inserted = false;

    NSArray *tarry = @[@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9"];

    while (index < targetStr.length-1)

    {

        index++;

        NSString *currChar = [targetStr substringWithRange:NSMakeRange(index, 1)];

        BOOL cf = [tarry containsObject:currChar];

        if ([lChar isEqualToString: @":"] && cf && [llid isEqualToString:@"\""])

        {

            inserted = true;

            rStr = [rStr stringByAppendingString:@"\""];

            llid = @"";

        }

        else if (inserted && ([currChar isEqualToString: @"}"] || [currChar isEqualToString: @","]))

        {

            inserted = false;

            rStr = [rStr stringByAppendingString:@"\""];

        }

        rStr = [rStr stringByAppendingString:currChar];

        if (currChar.length > 0 && ![currChar isEqualToString:@" "])

        {

            if ([currChar isEqualToString:@"\""])

            {

                llid = currChar;

            }

            else if (![currChar isEqualToString:@":"])

            {

                llid = @"";

            }

            lChar = currChar;

        }

    }

    return rStr;

}