iOS 接口返回NSNumber类型处理,支持四舍五入

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接口返回数据类型NSNumber如下
84.430000000000007
1.1799999999999999

处理步骤:
第一步:
#import "NSNumberFormatter+Helper.h"
NSNumberFormatter分类中实现
+ (NSNumberFormatter *)numWithIdentify:(NSString *)identify{
    // 版本2 ，使用当前线程字典来保存对象
    NSMutableDictionary *threadDic = [[NSThread currentThread] threadDictionary];
    NSNumberFormatter *formatter = [threadDic objectForKey:identify];
    if (!formatter) {
        formatter = [[NSNumberFormatter alloc]init];
        [threadDic setObject:formatter forKey:identify];
    }
    return formatter;
}

第二步:
#import "NSNumber+Helper.h"
NSNumberFormatter分类中实现

-(NSString *)stringWithIdentify:(NSString *)identify{
    NSNumberFormatter *formatter = [NSNumberFormatter numWithIdentify:identify];
//    DDLog(@"_%p_",formatter);//确保formatter为同一对象
    formatter.minimumIntegerDigits = 1;
    formatter.maximumFractionDigits = 2;
    formatter.roundingMode = NSNumberFormatterRoundFloor;
    NSString *string = [formatter stringFromNumber:self];
    return string;
}

//最终调用方法
-(NSString *)BN_StringValue{
    return [self stringWithIdentify:@"四舍五入"];
    
}
---
举例(目前完美适应整数和double):
if ([value isKindOfClass:[NSNumber class]]) {
      NSString *string = [(NSNumber *)value BN_StringValue];
}
Printing description of string:
84.43
Printing description of string:
1.18