问题描述
目标是获取当前的NSManagedObjectContext以便使用Core Data。在iOS 4.3中，我将UINavigationController的代理设置为AppDelegate（在AppDelegate.m中）：
The objective is to get the current NSManagedObjectContext in order to work with Core Data. In iOS 4.3 I set the UINavigationController's delegate to be the AppDelegate like so (in AppDelegate.m):
self.navigationController.delegate = self;
我可以做这样的事情（无论我需要上下文）：
and I could do something like this (wherever I needed the context):
NSManagedObjectContext *context = [self.navigationController.delegate performSelector:@selector(managedObjectContext)];
现在，在iOS 5中，我正在使用一个故事板，我很难想出怎么实现呢我使用了一个代表，因为我不认为你想让你的AppDelegate.h在所有的时间。
Now, in iOS 5, I am using a Storyboard and I'm having a difficult time figuring out how to achieve this. I used a delegate in the first place because I don't think you want to be passing your AppDelegate.h around all the time.
推荐答案
@Rose - 再次？即使是苹果也非常不鼓励：
@Rose - Again? It is highly discouraged even by Apple:
从Apple ：
推荐方法：
Recommended way:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
// Override point for customization after application launch.
UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
MasterViewController *controller = (MasterViewController *)navigationController.topViewController;
controller.managedObjectContext = self.managedObjectContext;
return YES;
}
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