EXC_BAD_ACCESS（code = 1）错误的主从应用程序

Question

当我更改详细视图时，我的iPad应用程序崩溃。我设置了一个异常断点来查明导致问题的代码行。它似乎发生得相当零星，所以我不确定发生了什么事情。有什么建议么？在我的主视图控制器

self.splitViewController.viewControllers = details; 

我didSelectRowAtIndexPath方法方法

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    if (indexPath.row == 0) 
    { 
     KFBDetailViewController *detailViewController = [[KFBDetailViewController alloc] initWithNibName:@"KFBDetailViewController_iPad" bundle:nil]; 
     UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController]; 

     NSMutableArray *details = [self.splitViewController.viewControllers mutableCopy]; 

     [details replaceObjectAtIndex:1 withObject:detailNavigationController]; 

     self.splitViewController.viewControllers = details; 

     KFBAppDelegate *appDelegate = (KFBAppDelegate *)[[UIApplication sharedApplication]delegate]; 
     appDelegate.window.rootViewController = self.splitViewController; 
    } 

这也是另一种观点认为在这里做的：

例如，坠毁在这一行

appDelegate.splitViewController.viewControllers = details; 

以下是该选项的didSelectRowAtIndexPath：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    NSMutableArray *details = [self.splitViewController.viewControllers mutableCopy]; 

    UINavigationController *detailNav = [[UINavigationController alloc]initWithRootViewController:webViewController]; 

    [details replaceObjectAtIndex:1 withObject:detailNav]; 

    KFBAppDelegate *appDelegate = (KFBAppDelegate *)[[UIApplication sharedApplication]delegate]; 

    appDelegate.splitViewController.viewControllers = details; 
    appDelegate.window.rootViewController = self.splitViewController; 
    appDelegate.splitViewController.delegate = webViewController; 

    [appDelegate.splitViewController viewWillAppear:YES]; 

    // Grab the selected item 
    RSSItem *entry = [[channel items]objectAtIndex:[indexPath row]]; 

    NSLog(@"Channel Items: %@", [[channel items]objectAtIndex:[indexPath row]]); 

    // Construct a URL with the link string of the item 
    NSURL *url = [NSURL URLWithString:[entry link]]; 

    NSLog(@"Link: %@", [entry link]); 

    // Construct a request object with that URL 
    NSURLRequest *req = [NSURLRequest requestWithURL:url]; 

    NSLog(@"URL: %@", url); 

    // Load the request into the web view 
    [[webViewController webView]loadRequest:req]; 
    webViewController.hackyURL = url; 
    NSLog(@"Request: %@", req); 

    // Set the title of the web view controller's navigation item 
    [[webViewController navigationItem]setTitle:[entry title]]; 

    NSLog(@"Title: %@", [entry title]); 
} 

编辑：应用程序似乎当我在主视图控制器表视图选择第一行，以显示初始细节视图然后选择另一行显示不同的内容崩溃。如果我不在任何时候选择第一行，一切正常。

Answer 1

我设法通过调整在主视图中点击第一行时如何显示初始详细视图来解决问题。

您可以在我的原始文章中看到原始实施。这是我如何改变它。

if (indexPath.row == 0) 
    { 
     KFBDetailViewController *detailViewController = [[KFBDetailViewController alloc]initWithNibName:@"KFBDetailViewController_iPad" bundle:nil]; 

     NSMutableArray *details = [self.splitViewController.viewControllers mutableCopy]; 

     UINavigationController *detailNav = [[UINavigationController alloc]initWithRootViewController:detailViewController]; 

     [details replaceObjectAtIndex:1 withObject:detailNav]; 

     KFBAppDelegate *appDelegate = (KFBAppDelegate *)[[UIApplication sharedApplication]delegate]; 
     appDelegate.splitViewController.viewControllers = details; 
     appDelegate.window.rootViewController = self.splitViewController; 
     appDelegate.splitViewController.delegate = detailViewController; 
     [appDelegate.splitViewController viewWillAppear:YES]; 
    }