如何在iOS中解析JSON数据

Question

I am getting response from server in this format

{updated_at: 12345555 dates:
    [{"start_date": "2014-03-02", "end_date": "2014-03-02"},
     {"start_date": "2014-04-02", "end_date": "2014-04-02"},
     {"start_date": "2014-05-02", "end_date": "2014-05-02"}]}

I want to parse this information and add it to 2 NSmutableArrays, I am not understanding how to do this

I tried this

NSMutableArray *startDate = [NSMutableArray array];
NSMutableArray *endDate = [NSMutableArray array];

[dictionaries enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
    [startDate addObject:[obj valueForKeyPath:@"start_date"]];
    [endDate addObject:[obj valueForKeyPath:@"end_date"]];

}];

But I get error saying that the key is invalid. I am not understanding where I am going wrong.

Answer 1

{} : means NSDictionary

[] : means NSArray

 NSArray *dates = [yourJsonData objectForKey:@"dates"];
 for(NSDictionary *data in dates){
    [startDate addObject: [data objectForKey: start_date];
    [endDate addObject: [data objectForKey: end_date];
 }

Answer 2

You're trying to enumerate NSDictionary while you have NSArray . Your dictionaries object should be of type NSArray then

for(int i = 0; i<dictionaries.count; i++)
{
  [startDate addObject:[obj valueForKeyPath:@"start_date"]];
  [endDate addObject:[obj valueForKeyPath:@"end_date"]];
}

Answer 3

If the shown data is what you get, then it's not valid JSON.

In JSON, the keys need to be quoted and there needs to be a comma between key/value pairs:

{"updated_at": 12345555 dates:
    [{"start_date": "2014-03-02", "end_date": "2014-03-02"},
     {"start_date": "2014-04-02", "end_date": "2014-04-02"},
     {"start_date": "2014-05-02", "end_date": "2014-05-02"}]}