返回到 iPhone 上使用 Core Data 的基于钻取导航的应用程序中的列表
我想构建一个简单的深入应用程序（类似于 iPhone 上的联系人应用程序）。我正在使用 Xcode 4.0。
我首先制作一个新的“基于导航的应用程序”，并且还说我将使用核心数据进行存储。然后我去添加“新文件”并选择 UIViewController 和 UIViewController 的子类。
在我的 RootViewControler （在模板中制作）的 didSelectRowAtIndexPath 中，我执行以下操作：
NSManagedObject *managedObject = [self.fetchedResultsController objectAtIndexPath:indexPath];
TrackerDetailViewController *trackerView = [[TrackerDetailViewController alloc] initWithNibName:@"TrackerDetailViewController" bundle:nil];
trackerView.title = [managedObject valueForKey:@"trackerName"];
trackerView.referringObject = managedObject;
[self.navigationController pushViewController:trackerView animated:YES];
[trackerView release];
这有效 - 我可以在 TrackerDetailViewController 中加载一些详细信息。
我似乎不知道如何回去！我在网上阅读的大多数地方都说这应该自动发生。我似乎无法让这种情况发生。如果我下载一些示例并编译它们，它们确实有一个后退按钮 - 但我不知道它是如何添加或管理的，也找不到我缺少的东西。
I want to build a simple drill down app (similar to the Contacts app on the iPhone). I am using Xcode 4.0.
I start by making a new "Navigation Based Application", and also say that I will be using Core Data for storage. I then go and add 'New File' and select UIViewController, and a subclass of UIViewController.
In my RootViewControler (which was made in the template) at didSelectRowAtIndexPath, I do the following:
NSManagedObject *managedObject = [self.fetchedResultsController objectAtIndexPath:indexPath];
TrackerDetailViewController *trackerView = [[TrackerDetailViewController alloc] initWithNibName:@"TrackerDetailViewController" bundle:nil];
trackerView.title = [managedObject valueForKey:@"trackerName"];
trackerView.referringObject = managedObject;
[self.navigationController pushViewController:trackerView animated:YES];
[trackerView release];
And this works - I can load up some details in TrackerDetailViewController.
What I cant seem to figure out is how to go back! Most places I am reading online say that this should be happening automatically. I can't seem to get that to happen. If I download a few samples and compile them, they do have a back button - but I dont see how it was added or managed, and can't find what I am missing to not have it.
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检查
[managementObject valueForKey:@"trackerName"]是否实际返回任何内容。如果不是，则没有标题，也不会创建后退按钮。哎呀，只需重新阅读您的代码即可。需要分配头衔的是父母。添加类似
self.title = @"myName;的内容，然后 myName 应在 trackerView 中显示为后退按钮。Check if
[managedObject valueForKey:@"trackerName"]is actually returning anything. If not, then there's no title, and no back button will be created.Oops, just re-read your code. It's the parent that needs a title assigned. Add something like
self.title = @"myName;and myName should then appear as your back button in trackerView.