UIViewでのタッチイベントが通知されない

// UITableViewクラス:PhotoListViewController.m
- (void)viewDidLoad
{
    [super viewDidLoad];
    if (self.tableView == nil) {
        self.tableView = [[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];
        self.tableView.backgroundColor = BODY_COLOR;
        self.tableView.translatesAutoresizingMaskIntoConstraints = NO;
        if (@available(iOS 11.0, *)) {
            self.tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentAutomatic;
        } 
        [self.tableView.layer setBorderColor:LOG_COLOR.CGColor];
        [self.tableView.layer setBorderWidth:4.0f];
        self.tableView.delegate = self;
        self.tableView.dataSource = self;
        [self.view addSubview:self.tableView];
    }
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;

    self.tableView.userInteractionEnabled = YES;
    self.view.userInteractionEnabled = YES;

    //savebutton
    CGRect frame = saveBarController_.view.frame;
    frame.origin.y = self.tableView.frame.size.height;
    saveBarController_.view.frame = frame;
    [self.view addSubview:saveBarController_.view];

    PRINT_RECT(saveBarController_.view.frame);

    [self.tableView reloadData];

    PBDataManager *manager = [[[PBDataManager alloc]init] autorelease];
    [manager save:nil];
}

- (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"cell";

    ThumbnailCell *cell = (ThumbnailCell *)[aTableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[ThumbnailCell alloc]init]autorelease];
    }

    [cell setThumbnail:[thumbnailManager_ thumbnailAtRow:indexPath.row]];
    cell.backgroundColor = [UIColor clearColor];
    return cell;
}

// UITableViewCellクラス:ThumbnailCell.m
- (id)init
{
    self = [super initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];

    if (self) {
        self.selectionStyle = UITableViewCellSelectionStyleNone;
        thumbnailViews_ = [[NSArray arrayWithObjects:
                        [[[ThumbnailView alloc]init]autorelease]
                        ,[[[ThumbnailView alloc]init]autorelease]
                        ,[[[ThumbnailView alloc]init]autorelease]
                        ,[[[ThumbnailView alloc]init]autorelease]
                        ,nil]retain];
        int count = 1;
        int margin = 4;
        int width = 75;

        for (ThumbnailView *thumb in thumbnailViews_) {
            thumb.frame = CGRectMake(count * margin + (count-1) * width, 4, 75, 75);
            thumb.autoresizingMask = 0;
            thumb.userInteractionEnabled = YES;
            [self addSubview:thumb];
            count++;
        }
    }
    return self;
}

// UIViewクラス:ThumbnailView.m
- (id)init
{
    self = [super initWithFrame:CGRectMake(0, 0, 75, 75)];
    if (self) {
        [self setupLayer];
    }
    return self;
}
- (void)setupLayer
{
    imageLayer_ = [[UIImageView alloc]initWithFrame:self.bounds];
    imageLayer_.frame = self.bounds;
    videoLayer_ = [[UIImageView alloc]initWithFrame:self.bounds];
    videoLayer_.frame = self.bounds;
    duration_ = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 40, 15)];
    duration_.backgroundColor = [UIColor clearColor];
    duration_.frame = CGRectMake(30, 60, 40, 15);
    [self addSubview:imageLayer_];
    [self addSubview:videoLayer_];
    [self addSubview:duration_];
}

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
// タッチイベントが通知されません
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
// タッチイベントが通知されません
}

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
// タッチイベントが通知されません
}

- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
// タッチイベントが通知されません
}