JSONを提供するRESTfulAPIがあります。私はそれをこのように呼んでいます:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
dispatch_async(kBgQueue, ^{
NSData* data = [NSData dataWithContentsOfURL:
kProjectList];
[self performSelectorOnMainThread:@selector(fetchedData:)
withObject:data waitUntilDone:YES];
});
}
次に、fetchedDataメソッドがあります。
- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
//NSArray *projects = [json objectForKey:@"name"]; //2
NSLog(@"name: %@", json); //3
}
// NSArray行のコメントを外すと、-[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x6d81720
コメントアウトすると、私の辞書は次のように記録されます。
(
{
"created_at" = "2012-04-04T01:46:51Z";
description = "First Project Created";
id = 1;
name = "Test 1";
"updated_at" = "2012-04-04T01:46:51Z";
},
{
"created_at" = "2012-04-04T01:47:23Z";
description = "Second Project Created";
id = 2;
name = "Test 2";
"updated_at" = "2012-04-04T01:47:23Z";
}
)