objective-c - ネストされた completionBlock が objc と呼ばれない

Question

これは私のネストされたブロックです。見てください:

- (void)getVideoList:(NSDictionary*)videoData
     completionBlock:(void (^)(NSMutableArray *))
completionBlock {
    NSArray *videos = (NSArray*)[videoData objectForKey:@"items"];
    NSMutableArray* videoList = [[NSMutableArray alloc] init];

    for (NSDictionary *videoDetail in videos) {
        if (videoDetail[@"id"][@"videoId"]){
            [self initializeDictionary:videoDetail completionBlock:^(YoutubeVideo * utubeVideo) {
                [videoList addObject:utubeVideo];
//                NSLog(@"zuuudo %@", utubeVideo.channelProfileImageURL);
            }];
        }
    }
    completionBlock(videoList);
}

- (void)initializeDictionary:(NSDictionary *)dictionary completionBlock:(void (^)(YoutubeVideo *))
completionBlock {
    YoutubeVideo *youtubeVideo = [[YoutubeVideo alloc] init];

    youtubeVideo.videoTitle = dictionary[@"snippet"][@"title"];
    youtubeVideo.videoID = dictionary[@"id"][@"videoId"];
    youtubeVideo.channelID = dictionary[@"snippet"][@"channelId"];
    [self getChannelProfilePictureForChannelID:youtubeVideo.channelID completionBlock:^(NSMutableArray *channelList) {
        NSLog(@"[channelList objectAtIndex:0] %@", [channelList objectAtIndex:0]);
        youtubeVideo.channelProfileImageURL = [channelList objectAtIndex:0];
    }];
    youtubeVideo.channelTitle = dictionary[@"snippet"][@"channelTitle"];
    youtubeVideo.videoDescription = dictionary[@"snippet"][@"description"];
    youtubeVideo.pubDate = [self dateWithJSONString:dictionary[@"snippet"][@"publishedAt"]];
    youtubeVideo.thumbnailURL = dictionary[@"snippet"][@"thumbnails"]
    [@"high"][@"url"];
    completionBlock(youtubeVideo);
}

- (void)getChannelProfilePictureForChannelID:(NSString*)channelID completionBlock:(void (^)(NSMutableArray *))completionBlock
{
    NSString *URL = [NSString stringWithFormat:@"https://www.googleapis.com/youtube/v3/channels?part=snippet&fields=items/snippet/thumbnails/default&id=%@&key=%@", channelID, apiKey];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:[URL stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]]];

    NSURLSession *session = [NSURLSession sharedSession];
    [[session dataTaskWithRequest:request
                completionHandler:^(NSData *data,
                                    NSURLResponse *response,
                                    NSError *error) {
                    if (!error){
                        [self getChannelProfileImageList:[NSJSONSerialization JSONObjectWithData:data options:0 error:nil] completionBlock:
                         ^(NSMutableArray * channelList) {
                             // return the final list
                             completionBlock(channelList);
                         }];
                    }
                    else {
                        // TODO: better error handling
                        NSLog(@"error = %@", error);
                    }
                }] resume];
}

- (void)getChannelProfileImageList:(NSDictionary*)channelData
     completionBlock:(void (^)(NSMutableArray *))
completionBlock {
    NSArray *channels = (NSArray*)[channelData objectForKey:@"items"];
    NSMutableArray *channelList = [[NSMutableArray alloc] init];

    for (NSDictionary *channelDetail in channels) {
        [self initializeDictionaryForChannelProfileImage:channelDetail completionBlock:^(NSString *chnlProfileImageURL) {
            [channelList addObject:chnlProfileImageURL];
        }];
        //[channelList addObject:[self initializeDictionaryForChannelProfileImage:channelDetail]];
        //[channelList addObject:[[YoutubeVideo alloc] initWithDictionaryForChannelProfileImage:channelDetail]];
    }
    completionBlock(channelList);
}

- (void)initializeDictionaryForChannelProfileImage:(NSDictionary *)dictionary completionBlock:(void (^)(NSString *))
completionBlock
{
    _channelProfileImageURL = dictionary[@"snippet"][@"thumbnails"]
    [@"default"][@"url"];

    completionBlock(_channelProfileImageURL);
}

問題はこの- (void)initializeDictionary:(NSDictionary *)dictionary completionBlock:(void (^)(YoutubeVideo *)) completionBlock { }ブロックにあり、以下のブロックがあります

[self getChannelProfilePictureForChannelID:youtubeVideo.channelID completionBlock:^(NSMutableArray *channelList) { NSLog(@"[channelList objectAtIndex:0] %@", [channelList objectAtIndex:0]); youtubeVideo.channelProfileImageURL = [channelList objectAtIndex:0]; }];

ブロックが値を返すときに、これらのコード行が実行されていない場所NSSting。

youtubeVideo.channelProfileImageURL = _channelProfileImageURL;
NSLog(@"youtubeVideo.channelProfileImageURL %@", youtubeVideo.channelProfileImageURL);

残りのコードを実行した後に呼び出されます。

    youtubeVideo.channelTitle = dictionary[@"snippet"][@"channelTitle"];
    youtubeVideo.videoDescription = dictionary[@"snippet"][@"description"];
    youtubeVideo.pubDate = [self dateWithJSONString:dictionary[@"snippet"][@"publishedAt"]];
    youtubeVideo.thumbnailURL = dictionary[@"snippet"][@"thumbnails"]
    [@"high"][@"url"];

そのため、オブジェクト モデルに値が挿入されません。提案をお願いします。前もって感謝します。
良い一日を過ごしてください。