如何在折返時查看核心數據搜索結果FRC以查看？

Question

我的核心數據搜索存在問題。加載後，我的整個表格都可見。好。我按下我的搜索按鈕，輸入一個術語，然後按搜索。顯示正確的行。好。

問題是，當我退出表視圖到我的頂級視圖（多級表視圖）並向下鑽取到表。我之前過濾的搜索結果仍然顯示。我如何讓FRC從之前轉儲搜索謂詞並在條目中顯示所有記錄？

這裏是我的代碼的相關部分：

- (void)viewDidLoad { 
      [super viewDidLoad]; 

      if (managedObjectContext == nil) { managedObjectContext = [(RecipesAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; } 

      //search 
      UISearchDisplayController *searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:sBar contentsController:self]; 

      [self performSelector:@selector(setSearchDisplayController:) withObject:searchDisplayController]; 

      [searchDisplayController setDelegate:self]; 
      [searchDisplayController setSearchResultsDataSource:self]; 
      [searchDisplayController setSearchResultsDelegate:self]; 
      [searchDisplayController release]; 

      NSError *error; 
      if (![[self fetchedResultsController] performFetch:&error]) { 
      NSLog(@"Unresolved error %@, %@", error, [error userInfo]); 
      exit(-1); 
      } 

      self.filteredListContent = [NSMutableArray arrayWithCapacity:[[[self fetchedResultsController] fetchedObjects] count]]; 
} 

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar { 

    if (self.sBar.text !=nil) 
    { 
     NSPredicate *predicate =[NSPredicate predicateWithFormat:@"name contains[cd] %@", self.sBar.text]; 

     [fetchedResultsController.fetchRequest setPredicate:predicate]; 
    } 

    NSError *error = nil; 
    if (![[self fetchedResultsController] performFetch:&error]) { 
     // Handle error 
     NSLog(@"Unresolved error %@, %@", error, [error userInfo]); 
     exit(-1); // Fail 
    }   

    [self.myTable reloadData]; 

    [sBar resignFirstResponder]; 

} 

- (NSFetchedResultsController *)fetchedResultsController { 

    // Set up the fetched results controller if needed. 
    if (fetchedResultsController == nil) { 

     // Create the fetch request for the entity. 
     NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 

     // Edit the entity name as appropriate. 
     NSEntityDescription *entity = [NSEntityDescription entityForName:@"MyEntity" inManagedObjectContext:managedObjectContext]; 
     [fetchRequest setEntity:entity]; 

     //set batch size 
     [fetchRequest setFetchBatchSize:20]; 

     // Edit the sort key as appropriate. 
     NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES]; 
     NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; 

     [fetchRequest setSortDescriptors:sortDescriptors]; 

     // Edit the section name key path and cache name if appropriate. 
     // nil for section name key path means "no sections". 
     NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:@"name" cacheName:nil]; 
     aFetchedResultsController.delegate = self; 
     self.fetchedResultsController = aFetchedResultsController; 

     [aFetchedResultsController release]; 
     [fetchRequest release]; 
     [sortDescriptor release]; 
     [sortDescriptors release]; 
    } 

    return fetchedResultsController; 
} 

- (void)viewDidUnload { 
    self.filteredListContent = nil; 
    self.fetchedResultsController = nil; 
} 


- (void)dealloc { 
    self.filteredListContent = nil; 
    self.fetchedResultsController = nil; 

    [fetchedResultsController release]; 
    [managedObjectContext release]; 

    [filteredListContent release]; 

    [myTable release]; 

    [super dealloc]; 
} 

感謝

UPDATE：知道了，謝謝。 我只是調用這個方法：

- (void)loadClean { 

    if(fetchedResultsController){ 
     [fetchedResultsController release]; 
    } 

    fetchedResultsController = nil; 

    NSError *error; 
    if (![[self fetchedResultsController] performFetch:&error]) { 
     NSLog(@"Unresolved error %@, %@", error, [error userInfo]); 
     exit(-1); 
    } 

    [self.myTable reloadData]; 
} 

Answer 1

您需要提供的FRC一個新的讀取請求，並刪除其緩存。如果你使用相同的提取請求，你會得到相同的回報。