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JSON データを個々のオブジェクトの配列に格納する際に問題が発生しています。JSONリクエストを処理しているdispatch_asynchの実行に問題があるようです。メソッドの前にブレークポイントを作成し、アプリケーションをステップ実行すると、dispatch_async に送信されたブロックを通り抜けるように見えます。

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
    NSError *error = nil;
    NSURL *url = [NSURL URLWithString:@"http://sleepy-dusk-3603.herokuapp.com/companies.json"];
    NSString *json = [NSString stringWithContentsOfURL:url
                                              encoding:NSASCIIStringEncoding
                                                 error:&error];
    NSLog(@"\nJSON: %@ \n Error: %@", json, error);

    if(!error) {
        NSData *jsonData = [json dataUsingEncoding:NSASCIIStringEncoding];
        NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:jsonData
                                                                 options:kNilOptions
                                                                   error:&error];
        NSArray *tempArray = [NSArray arrayWithObjects:@"Call Support Desk", @"Call Genius Bar", nil];

        for (NSString *name in [jsonDict valueForKeyPath:@"name"]) {
            NSString *tempString = [[NSString alloc] initWithString:name];
            Company *company = [[Company alloc] initWithName:tempString available_actions:tempArray];
            [self addCompany:company];

この問題に関する皆様のご支援とご支援に心から感謝いたします。

4

2 に答える 2

1 
 if(!error) {
...
      }
else
{
    NSLog(@"%@",[error localizedDescription]);
}

エラーをログに記録し、何が起こっているかを見つけます

私が試したこのコードは非常にうまく機能しています

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
    NSError *error = nil;
    NSURL *url = [NSURL URLWithString:@"http://sleepy-dusk-3603.herokuapp.com/companies.json"];
    NSString *json = [NSString stringWithContentsOfURL:url
                                              encoding:NSASCIIStringEncoding
                                                 error:&error];
    NSLog(@"\nJSON: %@ \n Error: %@", json, error);

    if(!error) {
        NSData *jsonData = [json dataUsingEncoding:NSASCIIStringEncoding];
        NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:jsonData
                                                                 options:kNilOptions
                                                                   error:&error];
        NSArray *tempArray = [NSArray arrayWithObjects:@"Call Support Desk", @"Call Genius Bar", nil];

        for (NSString *name in [jsonDict valueForKeyPath:@"name"]) {
            NSString *tempString = [[NSString alloc] initWithString:name];
            NSLog(@"%@",tempString);
        }
    }
});

応答

2013-03-05 22:02:44.312 newTrial[4711:12303] 
JSON: [{"created_at":"2013-03-04T00:09:06Z","id":1,"name":"Apple","updated_at":"2013-03-04T00:09:06Z","actions":[{"created_at":"2013-03-04T00:09:07Z","id":1,"name":"Call Support Desk","updated_at":"2013-03-04T00:09:07Z"},{"created_at":"2013-03-04T00:09:07Z","id":2,"name":"Call Genius Bar","updated_at":"2013-03-04T00:09:07Z"}]},{"created_at":"2013-03-04T02:01:49Z","id":2,"name":"Comcast","updated_at":"2013-03-04T02:01:49Z","actions":[{"created_at":"2013-03-04T02:01:49Z","id":3,"name":"Account Services","updated_at":"2013-03-04T02:01:49Z"}]}] 
 Error: (null)
2013-03-05 22:02:51.766 newTrial[4711:12303] Apple

したがって、問題の私の仮定は、配列に値を格納する場所にあります。適切に初期化されていることを確認してください。問題はここにある可能性があります

Company *company = [[Company alloc] initWithName:tempString available_actions:tempArray];
[self addCompany:company];
于 2013-03-05T16:23:51.180 に答える
0

それは私にとって魅力のように機能します：

dispatch_queue_t _queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(_queue, ^{
    NSError *_error = nil;
    NSURL *_url = [NSURL URLWithString:@"http://sleepy-dusk-3603.herokuapp.com/companies.json"];
    NSData *_json = [NSData dataWithContentsOfURL:_url];
    if (_json) {
         id _response = [NSJSONSerialization JSONObjectWithData:_json options:kNilOptions error:&_error];
         if (!_error) {
            // do whatever you want to do here...
         } else {
            NSLog(@"%@", _response);
         }
    }
});

応答は次のとおりです。

(
        {
        actions =         (
                        {
                "created_at" = "2013-03-04T00:09:07Z";
                id = 1;
                name = "Call Support Desk";
                "updated_at" = "2013-03-04T00:09:07Z";
            },
                        {
                "created_at" = "2013-03-04T00:09:07Z";
                id = 2;
                name = "Call Genius Bar";
                "updated_at" = "2013-03-04T00:09:07Z";
            }
        );
        "created_at" = "2013-03-04T00:09:06Z";
        id = 1;
        name = Apple;
        "updated_at" = "2013-03-04T00:09:06Z";
    },
        {
        actions =         (
                        {
                "created_at" = "2013-03-04T02:01:49Z";
                id = 3;
                name = "Account Services";
                "updated_at" = "2013-03-04T02:01:49Z";
            }
        );
        "created_at" = "2013-03-04T02:01:49Z";
        id = 2;
        name = Comcast;
        "updated_at" = "2013-03-04T02:01:49Z";
    }
)
于 2013-03-05T16:44:27.973 に答える