ios - 解析来自 googleapi 的数据

Question

我正在尝试构建一个使用来自以下网址的数据的应用程序:http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=8&q=http%3A%2F%2Fnews.google.com%2Fnews%3Foutput%3Drss

到目前为止，我正在用这个下载它:

- (void) downloadData {
    NSString *url = @"http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=8&q=http%3A%2F%2Fnews.google.com%2Fnews%3Foutput%3Drss";

    // Create NSUrlSession
    NSURLSession *session = [NSURLSession sharedSession];

    // Create data download taks
    [[session dataTaskWithURL:[NSURL URLWithString:url]
            completionHandler:^(NSData *data,NSURLResponse *response,NSError *error) {

                NSError *jsonError;
                self.issueData = [NSJSONSerialization JSONObjectWithData:data
                                                                 options:NSJSONReadingAllowFragments
                                                                   error:&jsonError];
                // Log the data for debugging
                NSLog(@"DownloadedData:%@",self.issueData);

                // Use dispatch_async to update the table on the main thread
                // Remember that NSURLSession is downloading in the background
                dispatch_async(dispatch_get_main_queue(), ^{
                    [self.tableView reloadData];
                });
            }] resume];
}

并尝试将其插入到我的表格 View 单元格中:

- (CustomTableViewCell *)tableView:(UITableView *)tableView     cellForRowAtIndexPath:(NSIndexPath *)indexPath {
CustomTableViewCell *cell = [tableView     dequeueReusableCellWithIdentifier:@"customTableViewCell" forIndexPath:indexPath];

NSLog(@"Working on cell:%ld",(long)indexPath.row);
NSDictionary *thread = [self.issueData objectAtIndex:indexPath.row];
cell.title.text = [thread objectForKey:@"description"];

cell.date.text = [thread objectForKey:@"publishedDate"];

cell.content.text = [thread objectForKey:@"contentSnippet"];


return cell;

有人知道我做错了什么吗？

Answer 1

您的 json 顶级对象不是数组，所以 NSDictionary *thread = [self.issueData objectAtIndex:indexPath.row];这是行不通的。您的顶级对象是字典，因此解析将如下

(CustomTableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"customTableViewCell" forIndexPath:indexPath];

    NSLog(@"Working on cell:%ld",(long)indexPath.row);
    NSDictionary *thread = [self.issueData objectForKey:@"responseData"];
    NSDictionary *feed = [thread objectForKey:@"feed"];

    cell.title.text = [feed objectForKey:@"description"];

    NSArray *entries = [feed objectForKey:@"entries"];
    NSDictionary *posts = entries[indexPath.row];
    cell.date.text = [posts objectForKey:@"publishedDate"];

    cell.content.text = [posts objectForKey:@"contentSnippet"];


    return cell;
}