核心數據文本網址爲RSS iPhone應用程序

Question

我有這樣的代碼來配置核心數據的單元： 代碼：

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

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

但是當我點擊該行，在這裏，我想要做的是： 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]; 

} 

插入一行文本到這個網址： 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; 
} 

因此，在說lindsay + lohan的地方，我會把用戶搜索詞放在這裏。問題是，第三部分代碼是在BlogRss.m中，前兩部分是在RootViewController.m中？不知道如何建立鏈接？任何想法...

感謝

Answer 1

您需要將NSManagedObject傳遞到進入視圖控制器：

- (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; 
} 

這意味着你的RssFunViewController需要有一個叫做selectedObject屬性，它被聲明爲NSManagedObject。

然後你就可以完成你的方法：

- (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]];