UISplitViewController使用UISearchController在搜索時不傳遞對象到detailView

Question

我創建了一個主 - 細節應用程序，我爲tableview實現了一個UISearchController。

當搜索爲空時，TableView和detailViews可以正常工作，但在搜索tableview時會顯示正確過濾的對象，但無法將其傳遞給detailView。

任何幫助將不勝感激。提前致謝。

#pragma mark - 
#pragma mark Table view data source 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    return [[self.fetchedResultsController sections] count]; 
} 


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 

     id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section]; 
     return [sectionInfo numberOfObjects]; 
} 

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section 
{ 
    // Display the First Letter of the person's last name as section headings. 
    //return [[[fetchedResultsController sections] objectAtIndex:section] name]; 
    id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section]; 

    return [NSString stringWithFormat:@"%@", [sectionInfo name]]; 
} 

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index { 

    if (index == 0) { 
     // search item 
     [tableView scrollRectToVisible:[[tableView tableHeaderView] bounds] animated:NO]; 
     return -1; 
    } 
    return index-1; 
} 

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView 
{ 
    // Return the array of section index titles 
    NSArray *searchArray = [NSArray arrayWithObject:UITableViewIndexSearch]; 
    return [searchArray arrayByAddingObjectsFromArray:self.fetchedResultsController.sectionIndexTitles]; 
} 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    //self.navigationItem.leftBarButtonItem = self.editButtonItem; 

    //UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)]; 
    //self.navigationItem.rightBarButtonItem = addButton; 
    self.detailViewController = (DetailViewController *)[[self.splitViewController.viewControllers lastObject] topViewController]; 

    self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Printers" style:UIBarButtonItemStylePlain target:nil action:nil]; 

    //instantiate a search results controller for presenting the search/filter results (will be presented on top of the parent table view) 
    UITableViewController *searchResultsController = [[UITableViewController alloc] initWithStyle:UITableViewStylePlain]; 

    searchResultsController.tableView.dataSource = self; 

    searchResultsController.tableView.delegate = self; 

    //instantiate a UISearchController - passing in the search results controller table 
    self.searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController]; 

    //this view controller can be covered by theUISearchController's view (i.e. search/filter table) 
    self.definesPresentationContext = YES; 


    //define the frame for the UISearchController's search bar and tint 
    self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0); 

    self.searchController.searchBar.tintColor = [UIColor whiteColor]; 

    //add the UISearchController's search bar to the header of this table 
    self.tableView.tableHeaderView = self.searchController.searchBar; 


    //this ViewController will be responsible for implementing UISearchResultsDialog protocol method(s) - so handling what happens when user types into the search bar 
    self.searchController.searchResultsUpdater = self; 


    //this ViewController will be responsisble for implementing UISearchBarDelegate protocol methods(s) 
    self.searchController.searchBar.delegate = self; 
} 

    #pragma mark - UISearchResultsUpdating 

    -(void)updateSearchResultsForSearchController:(UISearchController *)searchController { 

     //get search text from user input 

     [NSFetchedResultsController deleteCacheWithName:@"Master"]; 

     // Init a fetch request 
     NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 
     NSEntityDescription *entity = [NSEntityDescription entityForName:@"Event" inManagedObjectContext:self.managedObjectContext]; 
     [fetchRequest setEntity:entity]; 

     // Apply an ascending sort for the color items 
     NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"printer" ascending:YES selector:@selector(caseInsensitiveCompare:)]; 
     NSArray *descriptors = [NSArray arrayWithObject:sortDescriptor]; 
     [fetchRequest setSortDescriptors:descriptors]; 

     // Recover query 
     query = self.searchController.searchBar.text; 
     if (query && query.length) fetchRequest.predicate = [NSPredicate predicateWithFormat:@"(printer contains[cd] %@)",query]; 


     // Init the fetched results controller 
     NSError *error; 

     self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"fLetter" cacheName:@"Master"]; 

     self.fetchedResultsController.delegate = self; 

     if (![[self fetchedResultsController] performFetch:&error]) NSLog(@"Error: %@", [error localizedDescription]); 


     //now that the tableSections and tableSectionsAndItems properties are updated, reload the UISearchController's tableview 
     [((UITableViewController *)self.searchController.searchResultsController).tableView reloadData]; 
    } 

     - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{ 
    if ([[segue identifier] isEqualToString:@"showDetail"]) 
    { 
     NSLog(@"showDetail segue was called..."); 

     if ([self.searchController.searchBar.text isEqualToString:@""]) 
     { 
      NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow]; 
      Event *object = [[self fetchedResultsController] objectAtIndexPath:indexPath]; 
      DetailViewController *controller = (DetailViewController *)[[segue destinationViewController] topViewController]; 
      [controller setDetailItem:object]; 
      controller.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem; 
      controller.navigationItem.leftItemsSupplementBackButton = YES; 
      NSLog(@"Search Predicate was blank, and the code came here..."); 

     } 
     else 
     { 

      NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow]; 
      Event *object = [self.fetchedResultsController.fetchedObjects filteredArrayUsingPredicate:self.searchPredicate][indexPath.row]; 
      DetailViewController *controller = (DetailViewController *)[[segue destinationViewController] topViewController]; 
      [controller setDetailItem:object]; 
      controller.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem; 
      controller.navigationItem.leftItemsSupplementBackButton = YES; 

     NSLog(@"Searching: section %ld row %ld", (long)indexPath.section, (long)indexPath.row); 
     NSLog(@"searchPredicate %@", self.searchPredicate);   } 
     [self.searchController.searchBar setText:@""]; 
    } 
} 

Answer 1

NSIndexPath *indexPath = [self.fetchedResultsController.fetchedObjects filteredArrayUsingPredicate:self.searchPredicate][indexPath.row]; 

我敢肯定問題是在這條線。你在哪裏得到我在上面提到的最正確的indexPath？

當你正在尋找從一個的tableView選擇，的tableView總是返回選定行，以便使用

NSIndexPath *indexPath = [self.searchDisplayController.searchResultsTableView indexPathForSelectedRow]; 

而不是

NSIndexPath *indexPath = [self.fetchedResultsController.fetchedObjects filteredArrayUsingPredicate:self.searchPredicate][indexPath.row];