將核心數據文本轉換為RSS iphone應用程序的URL

Question

我有以下代碼可為核心數據配置單元格：代碼：

- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {

    NSManagedObject *managedObject = [self.fetchedResultsController objectAtIndexPath:indexPath];
    cell.textLabel.text = [[managedObject valueForKey:@"data"] description];
}

但是我想做的是當我單擊以下行時：代碼：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Navigation logic may go here -- for example, create and push another view controller.
     RssFunViewController *rssFun = [[RssFunViewController alloc] initWithNibName:@"RssFunViewController" bundle:nil];
     //NSManagedObject *selectedObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
     [self.navigationController pushViewController:rssFun animated:YES];
     [rssFun release];

}

在此處將行文本插入URL：代碼：

-(BOOL)fetchAndParseRss{
   NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

   [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

   //To suppress the leak in NSXMLParser
   [[NSURLCache sharedURLCache] setMemoryCapacity:0];
   [[NSURLCache sharedURLCache] setDiskCapacity:0];

   NSURL *url = [NSURL URLWithString:@"http://news.search.yahoo.com/rss?ei=UTF-8&p=lindsay+lohan&fr=news-us-ss"];
   BOOL success = NO;
   NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
   [parser setDelegate:self];
   [parser setShouldProcessNamespaces:YES];
   [parser setShouldReportNamespacePrefixes:YES];
   [parser setShouldResolveExternalEntities:NO];
   success = [parser parse];
   [parser release];
   [pool drain];
   return success;
}

所以說lindsay + lohan的地方，我將把用戶搜索詞放在這里。 關鍵是，第三段代碼在BlogRss.m和前兩位以及RootViewController.m中？ 不確定如何建立鏈接？？ 有任何想法嗎...

謝謝

Answer 1

您需要將NSManagedObject傳遞到傳入的視圖控制器中：

- (void)tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath 
{
  // Navigation logic may go here -- for example, create and push another view controller.
  RssFunViewController *rssFun = [[RssFunViewController alloc] initWithNibName:@"RssFunViewController" bundle:nil];
  NSManagedObject *selectedObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
  [rssFun setSelectedObject:selectedObject];
  [[self navigationController] pushViewController:rssFun animated:YES];
  [rssFun release], rssFun = nil;
}

這意味着您的RssFunViewController需要具有一個名為selectedObject的屬性，該屬性被聲明為NSManagedObject 。

然后，您可以完成您的方法：

- (BOOL)fetchAndParseRss 
{
   NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

   [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

   //To suppress the leak in NSXMLParser
   [[NSURLCache sharedURLCache] setMemoryCapacity:0];
   [[NSURLCache sharedURLCache] setDiskCapacity:0];

   NSString *terms = [[self selectedObject] vaueForKey:@"data"];
   NSURL *url = [NSURL URLWithString:[NSString stirngWithFormat:@"http://news.search.yahoo.com/rss?ei=UTF-8&p=%@&fr=news-us-ss", terms]];