iOS 5でjsonを使用してデータを取得しようとしましたが、失敗しました...誰かが私を助けてくれて、なぜうまくいかなかったのか教えてくれませんか。これが私の実装コードです
定義 :
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) //1
#define kLatestKivaLoansURL [NSURL URLWithString:@"http://jaksport.com/jarray.php"] //2
次に、viewdidloadで:
NSData* data = [NSData dataWithContentsOfURL:
kLatestKivaLoansURL];
[self performSelectorOnMainThread:@selector(fetchedData:)
withObject:data waitUntilDone:YES];
これは機能です:
- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
NSArray* key = [json objectForKey:@"price"]; //2
NSLog(@"value: %@", key); //3
}
これはjsonファイルです:
{
"prices":
{
"price":[
{
"id":1,
"name":"Rosie Gradas",
"beer":4.5,
"cider":4.5,
"guinness":4
},
{
"id":2,
"name":"Wicked Wolf",
"beer":5,
"cider":4.5,
"guinness":4
},
{
"id":3,
"name":"Cafe Posh",
"beer":6,
"cider":5.5,
"guinness":5.5
},
{
"id":4,
"name":"My House",
"beer":16,
"cider":15.5,
"guinness":15.5
}
]
}
}
nslogは常にnull値を出力します