iOS 字典升降序

方法一：

-(NSString*)stringWithDict:(NSDictionary*)dict{
    
    NSArray*keys = [dict allKeys];
    
    NSArray*sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1,id obj2) {
        return[obj1 compare:obj2 options:NSNumericSearch];//正序
    }];
    
    NSString*str =@"";
    
    for(NSString*categoryId in sortedArray) {
        
        id value = [dict objectForKey:categoryId];
        
        if([value isKindOfClass:[NSDictionary class]]) {
            
            value = [self stringWithDict:value];
            
        }
        
        if([str length] !=0) {
            
            str = [str stringByAppendingString:@","];
            
        }
        
        str = [str stringByAppendingFormat:@"%@:%@",categoryId,value];
        
    }
    NSLog(@"str:%@",str);
    return str;
}

方法二：

-(NSString *)getNeedSignStrFrom:(id)obj{
    NSDictionary *dict = obj;
    NSArray *arrPrimary = dict.allKeys;
    
    NSArray *arrKey = [arrPrimary sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2){
        NSComparisonResult result = [obj1 compare:obj2];
        return result==NSOrderedDescending;//NSOrderedAscending 倒序
    }];
    
    NSString*str =@"";
    
    for (NSString *s in arrKey) {
        id value = dict[s];
        if([value isKindOfClass:[NSDictionary class]]) {
            value = [self getNeedSignStrFrom:value];
        }
        if([str length] !=0) {
            
            str = [str stringByAppendingString:@","];
            
        }
        
        str = [str stringByAppendingFormat:@"%@:%@",s,value];
        
    }
    NSLog(@"str:%@",str);
    
    return str;
}