当我的主视图控制器被加载并且它调用viewDidLoad我执行取请求和退休阵列或我的核心数据对象：
+ (NSArray *)getData {
// Fetch Data
NSError *error = nil;
if (![[[AppDelegate instance] fetchedResultsController] performFetch:&error]) {
// Update to handle the error appropriately.
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
NSArray *items = [[AppDelegate instance].fetchedResultsController fetchedObjects];
return items;
}//end
出于某种原因，这从返回时调用空数组viewDidLoad 。
如果我从调用相同的方法viewDidAppear:它工作正常，返回NSArray我的CoreData对象。
是否有一个原因，为什么这不会在工作viewDidLoad ？
编辑：
读取的结果控制器的方法：
/**
* The controller the gets our results from core data
*
* @version $Revision: 0.1
*/
- (NSFetchedResultsController *)fetchedResultsController {
if (fetchedResultsController != nil) {
return fetchedResultsController;
}
// Create and configure a fetch request
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"SiteConfig" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
// Create the sort descriptors array
NSSortDescriptor *sectionTitle = [[NSSortDescriptor alloc] initWithKey:@"createdDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sectionTitle, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
// Create and initialize the fetch results controller
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"Root"];
self.fetchedResultsController = aFetchedResultsController;
fetchedResultsController.delegate = self;
// Memory management
return fetchedResultsController;
}//end
