Ios 斯威夫特：长按手势识别器不起作用

我有一个

uitable视图

，我想为每一行添加

uilongpressurerecognizer

。 我尝试在表格单元格上拖动识别器并为其引用操作，但从未调用过

我也试过了

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: ident, for: indexPath) as! TableViewCell
        /*...*/
    var longGesture = UILongPressGestureRecognizer(target: self, action: #selector(FilterPickerViewController.longPress))
    longGesture.minimumPressDuration = 1
    cell.leftLabel.addGestureRecognizer(longGesture)
    return cell
}

@objc func longPress(_ sender: UILongPressGestureRecognizer) {
    print("press")
}

---

但这也不起作用。我做错了什么？

您必须将长按手势识别器添加到表格视图中：

UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc] 
  initWithTarget:self action:@selector(handleLongPress:)];
lpgr.minimumPressDuration = 2.0; //seconds
lpgr.delegate = self;
[self.myTableView addGestureRecognizer:lpgr];
[lpgr release];

然后在手势处理程序中：获取单元格索引：-

-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
    CGPoint p = [gestureRecognizer locationInView:self.myTableView];

    NSIndexPath *indexPath = [self.myTableView indexPathForRowAtPoint:p];
    if (indexPath == nil) {
        NSLog(@"long press on table view but not on a row");
    } else if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {
        NSLog(@"long press on table view at row %ld", indexPath.row);
    } else {
        NSLog(@"gestureRecognizer.state = %ld", gestureRecognizer.state);
    }
}

---

泰，这很有效。你能告诉我[lpgr release]这一行需要什么，以及它是如何翻译成swift的吗？不过，如果没有它，它似乎可以工作