Question

我有一个基于JSON格式的NSArray。我从网上请求它并将其保存在数组中。我正在尝试使用字典来获取＆＃34; categoryname＆＃34;的值。和＆＃34; subscore＆＃34;并将它们存储在新数组中，但它们仍然是空的。我是否必须使用JSON序列化将数组转换回NSData，还是有更直接的方法来实现这一目标？

NSArray详细分数：

    {
      "articles": [
        {
          "abstract": "text",  
          "title": "title"
        }
      ], 
      "subscore": 3, 
      "categoryname": "Reporting"
    }, 
    {
      "articles": [
        {
          "abstract": "text2",  
          "title": "title"
        }
      ], 
      "subscore": 1, 
      "categoryname": "Power"
    }]
}

代码：

for(int i = 0; i < [self.detailedscore count]; i++)
    {


        NSMutableDictionary * dc = [self.detailedscore objectAtIndex:i];

        NSString * score = [dc objectForKey:@"subscore"];
        NSString * categoryname = [dc objectForKey:@"categoryname"];

        [self.allscores addObject:subscore];
        [self.allcategories addObject:categoryname];

        for (NSString *yourVar in allcategories) {

            NSLog (@"Your Array elements are = %@", yourVar);


        }

Answer 1

如果你使用下面代码的数组 for（int i = 0; i＆lt; [self.detailedscore count]; i ++） {

    NSMutableDictionary * dc = [self.detailedscore objectAtIndex:i];

    NSString * score = [dc objectForKey:@"subscore"];
    NSString * categoryname = [dc objectForKey:@"categoryname"];

    [self.allscores score];
    [self.allcategories addObject:categoryname];

    for (NSString *yourVar in allcategories) {

        NSLog (@"Your Array elements are = %@", yourVar);


    }

Answer 2

{} ----＆gt;是指字典，[] ---＆gt; array .....这是我遵循的规则，同时将来自webservices的返回值作为NSArray或NSDictionary .... 根据您当前的JSON格式，这可能会给您一个想法

NSMutableArray *categoryArray = [NSMutableArray new];
for (NSDictionary *childDict in self.detailedscore)
{
    [categoryArray addObject:[childDict objectForkey:@"categoryname"]];
}

Answer 3

问题不在数组或字典或Web请求中。我没有分配NSMutableArrays所以它们一直都是空的。该代码适用于从数组中提取值，以防任何人想要使用它。

Answer 4

希望这会有所帮助。

[NSURLConnection sendAsynchronousRequest：req queue：[NSOperationQueue mainQueue] completionHandler：^（NSURLResponse * response，NSData * data，NSError * connectionError）{ if（！connectionError）{ NSDictionary * dict = [NSJSONSerialization JSONObjectWithData：数据选项：NSJSONReadingAllowFragments错误：＆amp; connectionError]; NSLog（@“Dict％@”，dict）; BOOL isValid = [NSJSONSerialization isValidJSONObject：dict]; if（isValid）{ [target getJSONFromresponseDictionary：dict forConnection：strTag error：connectionError]; } 其他{ NSString * strResponse = [[NSString alloc] initWithData：数据编码：NSUTF8StringEncoding]; [target getStringFromresponseDictionary：strResponse forConnection：strTag error：error]; }

基于JSON格式从NSArray解析值

4 个答案: