バックグラウンドで返されるデジタルフォーマットは、フロントエンドの文字表示でエラーが発生したため、以下を自分で書きました.
strcmp

 C/C++  ，       
         str1，str2，
  str1==str2，    ；     ，  。
  str1  str1>str2，     。
 

hファイル:

 //
 // NSDictionary+hdObjectForKeyAndToString.h
 // JC
 //
 // Created by CML on 2017/7/19.
 // Copyright © 2017  zhaozilong. All rights reserved.
 // 
 
import 
 
 
@interface NSDictionary (hdObjectForKeyAndToString)
 
 
/**
           NSNumber  .
 
 
@param key keyString
 @return resultString
 /
 -(NSString)hdObjectForKeyAndToString:(NSString*)key;
 
 
@end
 

mファイル:

 //
 // NSDictionary+hdObjectForKeyAndToString.m
 // JC
 //
 // Created by CML on 2017/7/19.
 // Copyright © 2017  zhaozilong. All rights reserved.
 // 
 
import "NSDictionary+hdObjectForKeyAndToString.h"
 
 
@implementation NSDictionary (hdObjectForKeyAndToString)
 
 
-(NSString)hdObjectForKeyAndToString:(NSString)key{
 id result=[self objectForKey:key];
 if([result isKindOfClass:[NSNumber class]]){
 return [self hdNumberString:result];
 }
 return [result description];
 }
 
 
-(NSString)hdNumberString:(NSNumber)number{
 NSString *result=@"";
 const char *type=[number objCType];
 if (strcmp (type, @encode (NSInteger)) == 0) {
 result=[NSString stringWithFormat:@"%ld",[number integerValue]];
 } else if (strcmp (type, @encode (NSUInteger)) == 0) {
 result=[NSString stringWithFormat:@"%lu",[number unsignedIntegerValue]];
 } else if (strcmp (type, @encode (int)) == 0) {
 result=[NSString stringWithFormat:@"%d",[number intValue]];
 } else if (strcmp (type, @encode (float)) == 0) {
 result=[NSString stringWithFormat:@"%f",[number floatValue]];
 } else if (strcmp (type, @encode (double)) == 0) {
 result=[NSString stringWithFormat:@"%lf",[number doubleValue]];
 } else if (strcmp (type, @encode (long)) == 0) {
 result=[NSString stringWithFormat:@"%ld",[number longValue]];
 } else if (strcmp (type, @encode (long long)) == 0) {
 result=[NSString stringWithFormat:@"%lld",[number longLongValue]];
 } else {
 result=[NSString stringWithFormat:@"%ld",[number integerValue]];
 }
 if ([[result componentsSeparatedByString:@"."] count]>1) {
 result=[result stringByReplacingOccurrencesOfString:@"0+$"
 withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [result length])];
 }
 return result;
 }
 
 
@end