按字母表字母导航 tvOS UITableView

Question

我有一个 UITableView，它按字母顺序列出应用程序中的文件。由于有超过 1500 个文件，我试图实现在单击遥控器上的右键时按字母表字母导航的功能。我遇到的问题是 TableView 确实移动到了正确的位置，但我没有像通常那样突出显示，而是得到了更浅的突出显示颜色，并且单击选择什么也不做。如果我然后通过按下按钮正常导航，它会将其移回到列表中的第二项。我做错了什么？

-(void)viewDidLoad {
    [super viewDidLoad];
    self.tableView.delegate = self;
      self.tableView.dataSource = self;
    self.definesPresentationContext = YES;  // know where you want UISearchController to be displayed
    self.currentIndex = 0;
   
    [self populateTheView];
}
-(void)populateTheView {
    NSBundle *bundle = [NSBundle mainBundle];
    self.title = @"Devo Songs";
    self.files  = [bundle pathsForResourcesOfType:@"pdf" inDirectory:@"WorshipSongs"];
    NSString *documentsDirectoryPath = [self.files objectAtIndex:thepath.row];
    
    self.filenames = [[documentsDirectoryPath lastPathComponent] stringByDeletingPathExtension];
    
    
    
    NSMutableArray *names = [NSMutableArray arrayWithCapacity:[self.files count]];
    for (NSString *path in self.files) {
        [names addObject:[[path lastPathComponent] stringByDeletingPathExtension]];
    }
   
    //self.files = names;
    self.files = [names sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
    NSLog(@"FILESLOAD%@", self.files);
   

}
- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self becomeFirstResponder]; // Make the view controller the first responder to handle remote control events.
}

- (BOOL)canBecomeFirstResponder {
    return YES;
}

// Override pressesBegan method to detect right arrow key press event.
- (void)pressesEnded:(NSSet<UIPress *> *)presses withEvent:(UIPressesEvent *)event {
    [super pressesEnded:presses withEvent:event];

    for (UIPress *press in presses) {
        if (press.type == UIPressTypeRightArrow) {
            [self handleRightButtonPress];
        }
    }
}

- (void)handleRightButtonPress {
    // Get the current name.
    NSString *currentName = self.files[self.currentIndex];

    // Get the current letter.
    NSString *currentLetter = [currentName substringToIndex:1];

    // Find the next index starting from the current index.
    NSInteger nextIndex = self.currentIndex + 1;
    while (nextIndex < self.files.count) {
        NSString *nextName = self.files[nextIndex];
        NSString *nextLetter = [nextName substringToIndex:1];

        if (![nextLetter isEqualToString:currentLetter]) {
            break;
        }

        nextIndex++;
    }

    // Check if we found a valid next index.
    if (nextIndex < self.files.count) {
        // Scroll the table view to the row corresponding to the next letter.
        [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:nextIndex inSection:0]
                              atScrollPosition:UITableViewScrollPositionTop animated:NO];

        // Update the current index to the new index.
        self.currentIndex = nextIndex;
        
        // Deselect the current selected row (if any).
        NSIndexPath *previousSelectedIndexPath = [self.tableView indexPathForSelectedRow];
        if (previousSelectedIndexPath) {
            [self.tableView deselectRowAtIndexPath:previousSelectedIndexPath animated:NO];
        }

        // Select the cell at the specified index.
        NSIndexPath *indexPathToSelect = [NSIndexPath indexPathForRow:self.currentIndex inSection:0];
        [self.tableView selectRowAtIndexPath:indexPathToSelect animated:NO scrollPosition:UITableViewScrollPositionNone];
    } else {
        // If we have reached the end of the list, reset the index to the first element.
        self.currentIndex = 0;

        // Scroll back to the top of the table view.
        [self.tableView setContentOffset:CGPointZero animated:NO];

        // Deselect the current selected row (if any).
        NSIndexPath *previousSelectedIndexPath = [self.tableView indexPathForSelectedRow];
        if (previousSelectedIndexPath) {
            [self.tableView deselectRowAtIndexPath:previousSelectedIndexPath animated:NO];
        }

        // Select the cell at the specified index.
        NSIndexPath *indexPathToSelect = [NSIndexPath indexPathForRow:self.currentIndex inSection:0];
        [self.tableView selectRowAtIndexPath:indexPathToSelect animated:NO scrollPosition:UITableViewScrollPositionNone];
    }
}