Question

我正在尝试检测左侧滑动，因此在开始时添加到我的tableview：

  //swipe left
        UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
                                                                                         action:@selector(leftSwipe:)];
        [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
        [self.tableView addGestureRecognizer:recognizer];

然后用以下方法检测细胞本身：

- (void)leftSwipe:(UISwipeGestureRecognizer *)gestureRecognizer
{

        CGPoint location = [gestureRecognizer locationInView:self.tableView];
        NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:location];
        UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
       //show some menu in the cell position( its cell.frame)
}

仅当桌面视图没有向下滚动时才有效，这意味着在我向下滚动后，我检测到的检测位置是错误的，因此如果我尝试添加一些侧面菜单，它的位置不正确。

如果我在开始时检查这一点，而不滚动，则效果很好。

为什么？

Answer 1

解决。当我添加视图时，我将它放在视图中，而不是在tableView中，因此位置错误，因为它们是相对于滚动条计算的，而不是它自己的视图。

将菜单添加到tableView，将其放在正确的位置。

Answer 2

-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{


    static NSString *CellIdentifier = @"LazyTableCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.backgroundColor=[UIColor clearColor];
        if (tableView == tableviewMsg)
            cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    else
    {
        for (UIView *view in cell.contentView.subviews)
            [view removeFromSuperview];
    }
    UIView *SwipeView = [[UIView alloc]init];
    SwipeView.frame = CGRectMake(0,0,394,50);
    SwipeView.tag = -1001;
    [SwipeView setBackgroundColor:[UIColor clearColor]];
    [SwipeView setUserInteractionEnabled:YES];
    [cell.contentView addSubview:SwipeView];

        if([indexPath isEqual:indexSelected])
        {

            CGRect rect = SwipeView.frame;
            rect.origin.x = -45;
            SwipeView.frame = rect;
        }

        UISwipeGestureRecognizer* swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(cellSwipedLeft:)];
        [swipeGestureLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
        [cell addGestureRecognizer:swipeGestureLeft];


        UISwipeGestureRecognizer* swipeGestureRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(cellSwipedRight:)];
        [swipeGestureRight setDirection:UISwipeGestureRecognizerDirectionRight];
        [cell addGestureRecognizer:swipeGestureRight];



    cell.backgroundColor=[UIColor whiteColor];
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    return cell;

}
- (void)cellSwipedLeft:(UIGestureRecognizer *)gestureRecognizer {


    if (gestureRecognizer.state == UIGestureRecognizerStateEnded) {
        UITableViewCell *cell = (UITableViewCell *)gestureRecognizer.view;
        NSIndexPath* indexPath = [tableviewMsg indexPathForCell:cell];


        if ([indexPath isEqual:indexSelected]) {


        }
        else{

            [self hideButtonForIndex:indexSelected animated:YES];

            [self showButtonForIndex:indexPath animated:YES];

        }

    }
}
- (void)cellSwipedRight:(UIGestureRecognizer *)gestureRecognizer {

    if (gestureRecognizer.state == UIGestureRecognizerStateEnded)
    {
        UITableViewCell *cell = (UITableViewCell *)gestureRecognizer.view;
        NSIndexPath* indexPath = [tableviewMsg indexPathForCell:cell];
        if ([indexPath isEqual:indexSelected])
        {
            [self hideButtonForIndex:indexSelected animated:YES];
        }
    }
}

检测在表格

2 个答案: