将 JSON 字符串解析为 NSDictionary 为对象数组 Objective C

Question

我是 objective-c 的新人。他们为我的问题提供了很多解决方案，但我未能解决。我正在尝试解析 JSON 并且我成功完成了。代码如下：

     NSString *urlString   = [NSString stringWithFormat:@"%@",homePagesNews];
 // The Openweathermap JSON responder
        NSURL *url            = [[NSURL alloc]initWithString:urlString];
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        NSURLResponse *response;
        NSData *GETReply      = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
        NSDictionary *res     = [NSJSONSerialization JSONObjectWithData:GETReply options:NSJSONReadingMutableLeaves|| NSJSONReadingMutableContainers error:nil];
        NSLog(@"%@",res);

输出为：

{
    "item_id": "102949",
    "featured_image": "http://198.72.115.125/~pratidin/assets/news_images/2015/10/05/thumbnails/VC_mohit_ul_alam_pic.jpg",
    "main_news_url": "http://198.72.115.125/~pratidin/api/detailnews/102949",
    "title": "'শিক্ষকতা চর্চাহীন একটা তন্ত্র গোষ্ঠিতে পরিণত হয়েছে'",
    "datetime": "2015-10-05 20:13:44",
    "summery": "&#39;শিক্ষক সমাজ একেবারে চর্চাহীন একটা তন্ত্র&#8230;",
    "main_url": "http://198.72.115.125/~pratidin/api/categorynews/4"
  },
  {
    "item_id": "102198",
    "featured_image": "http://198.72.115.125/~pratidin/assets/news_images/2015/09/05/thumbnails/1438144816_104634.png.jpg",
    "main_news_url": "http://198.72.115.125/~pratidin/api/detailnews/102198",
    "title": "সাকার ছোট ছেলে হুম্মাম কারাগারে",
    "datetime": "2015-09-05 20:23:17",
    "summery": "রাজধানীর গুলশানে মারামারি অভিযোগে দায়ের&#8230;",
    "main_url": "http://198.72.115.125/~pratidin/api/categorynews/4"
  },
  {
    "item_id": "102180",
    "featured_image": "http://198.72.115.125/~pratidin/assets/news_images/2015/09/05/thumbnails/1_104567.jpg",
    "main_news_url": "http://198.72.115.125/~pratidin/api/detailnews/102180",
    "title": "আজ বীরশ্রেষ্ঠ নূর মোহাম্মদের ৪৪তম শাহাদতবার্ষিকী",
    "datetime": "2015-09-05 14:00:19",
    "summery": "মুক্তিযুদ্ধের রণাঙ্গণের সাহসী সন্তান&#8230;",
    "main_url": "http://198.72.115.125/~pratidin/api/categorynews/4"
  }

我想得到这个值 title,datetime,main_url。我检查波纹管提及 link .

提前致谢

Answer 1

您的响应是字典值的集合，因此您需要将响应存储在 NSArray 对象中，如下所示：

    NSArray *res     = [NSJSONSerialization JSONObjectWithData:GETReply options:NSJSONReadingMutableLeaves|| NSJSONReadingMutableContainers error:nil];

要获取属性，请使用以下代码：

    NSDictionary * dict = [res objectAtIndex:0];
    NSLog(@"title = %@", [dict objectForKey:@"title"]);

Answer 2

尝试使用此代码获取值

NSMutableArray *res     = [NSJSONSerialization JSONObjectWithData:GETReply options:NSJSONReadingMutableLeaves|| NSJSONReadingMutableContainers error:nil];
NSLog(@"%@",res);
// get item id
NSLog(@"item-id :%@",[[res objectAtIndex:0] objectForKey:@"item_id"]);
NSLog(@"datetime %@",[[res objectAtIndex:0] objectForKey:@"datetime"]);
NSLog(@"main_url %@",[[res objectAtIndex:0] objectForKey:@"main_url"]);

或从响应中获取所有值

for (int i=0; i< res.count; i++){
    NSLog(@"item-id :%@",[[res objectAtIndex:i] objectForKey:@"item_id"]);
    NSLog(@"datetime %@",[[res objectAtIndex:i] objectForKey:@"datetime"]);
    NSLog(@"main_url %@",[[res objectAtIndex:i] objectForKey:@"main_url"]);
}

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