在iOS中，选定的单元格应该移动到UITableView的顶部 [英] In iOS selected cell should move to top portion in UITableView

问题描述

我的自定义表格视图中有超过20个单元格，在执行时间内将显示6个单元格。现在我选择第4个单元意味着，第4个单元必须进入第一个位置，第5个单元进入第2个位置，依此类推。怎么做这个过程，我试过这样。

I have more than 20 cells in my custom table view, in execution time 6 cells will be visible. Now i select the 4 th cell means, that 4th cell have to come in first position and 5th cell in 2nd position and so on. how to do this process, i tried like this.

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    MACalendarCustomCell *cell = (MACalendarCustomCell*) [tableView dequeueReusableCellWithIdentifier:[MACalendarCustomCell reuseIdentifier]];
    if(cell == nil)
    {
        [[NSBundle mainBundle] loadNibNamed:@"MACalendarCustomCell" owner:self options:nil];
        cell = customCell;
        customCell = nil;

    }

        cell.lbl_CalendarTitle.text = [arr_CalendarTitle objectAtIndex:indexPath.row];
        cell.lbl_CalendarSubTitle.text = [arr_CalendarSubTitle objectAtIndex:indexPath.row];
        cell.lbl_calendarEventTime.text = [arr_CalendarEventTime objectAtIndex:indexPath.row];
        cell.lbl_calendarDate.text = [arr_CalendarDate objectAtIndex:indexPath.row];
        cell.lbl_CalendarMonth.text = [arr_CalendarMonth objectAtIndex:indexPath.row];
        cell.lbl_CalendarYear.text = [arr_CalendarYear objectAtIndex:indexPath.row];
        cell.img_BackGround.image = [UIImage imageNamed:@"calendar_Cell_Up.png"];

        //here click event is occurred.
        cell.btn_CollapseExpand.tag = indexPath.row;
        [cell.btn_CollapseExpand addTarget:self action:@selector(method_Expand:) forControlEvents:UIControlEventTouchUpInside];
    return cell;

}

ButtonPressed事件调用

ButtonPressed event calls

- (void)method_Expand:(UIButton*)sender
{
    UITableViewCell *cell = (UITableViewCell *)sender.superview;
    NSIndexPath *indexpath = [tbl_CalendarList indexPathForCell:cell];

    [tbl_CalendarList moveRowAtIndexPath:[NSIndexPath indexPathForItem:indexpath.row inSection:indexpath.section] toIndexPath:[NSIndexPath indexPathForItem:0 inSection:indexpath.section]];

    int_SelectedIndex = sender.tag;
    NSLog(@"Selected Button : %ld",(long)int_SelectedIndex);
    if ( int_TempSelectedIndex != int_SelectedIndex)
    {
        int_TempSelectedIndex = int_SelectedIndex;
    }
    else
    {
        int_TempSelectedIndex = -1;
    }

    [tbl_CalendarList reloadData];
}

调整单元格大小

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{

    if (indexPath.row == int_TempSelectedIndex )
    {
        cellSize = 300;
        isRowSelected[indexPath.row] = YES;
    }
    else
    {
        cellSize = 100;
        isRowSelected[indexPath.row] = NO;
    }

    return cellSize;

}

现在我在模拟器中喜欢这个。

Now i got Like this in simulator.

当我按下它时就是这样。

when i pressed it comes like this.

此选定的单元格应该位于第一位置。

This selected cell should come to first position.

推荐答案

您可以将表格视图滚动到该单元格，并且可以指定在选择单元格时将其滚动到顶部：

You can scroll your table view to that cell and you can specify that you want to scroll it on top when you select the cell:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

希望这就是你所追求的。

Hope this is what you are after.

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