在由步进器控制的单元格中设置标签-物镜c [英] Set a label in a cell that is controlled by a stepper - objective c

问题描述

我有一个UITableView，并且正在动态地向其中插入包含UIStepper和UILabel的单元格。 UILabel显示UIStepper的值。

Hi I have a UITableView and I am dymanically inserting cells into it that contain a UIStepper and a UILabel. The UILabel shows the value of the UIStepper.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];

    if(!cell)
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];

    [cell.textLabel setText:[self.myarray objectAtIndex:indexPath.row]];

    UIStepper *stepper = [[UIStepper alloc]init];

    UILabel *label = [[UILabel alloc]init];
    label.text = [NSString stringWithFormat:@"%.f", stepper.value];

    [cell addSubview:stepper];
    [cell addSubview:label];

    [stepper addTarget:self action:@selector(incrementStepper:) forControlEvents:UIControlEventValueChanged];
    return cell;
}

为了清晰起见，我删除了上面的某些行进行格式化，但是这可行，一切都很好。

I have removed some of the above lines that do the formatting for clarities sake but this works and everything is ok.

-(void)incrementSkillStepper:(id)sender
{
    UIStepper *stepper = (UIStepper*)sender;
    //set the label that is in the same cell as the stepper with index stepper.value.
}

当我单击特定单元格中的步进器时，我希望标签位于同一位置单元格增加，但是我的问题是addtarget的工作方式-我只能发送发送者，在这种情况下是事件的步进器，这意味着它无法访问动态创建的标签。有人知道我怎么可以通过增量步进代理方法设置标签的文本吗？

When I click the stepper in the specific cell I want the label in the same cell to increment, but my problem is in which the way that addtarget works - I can only send the sender which in this case is the stepper to the event which means it doesnt have access to the dynamically created label. Does anybody know how I can set the text of the label from the incrementStepper delegate method?

推荐答案

调用 [发件人超级视图] 来获取它所在的单元格，

Call [sender superview] to get the cell that it's in,

-(void)incrementSkillStepper:(id)sender
{
    UIStepper *stepper = (UIStepper*)sender;
    UITableViewCell* cell =  [stepper superview];

    UIView* subview = [[cell subviews] lastObject]; // Make sure your label *is* the last object you added.

    if ([subview isKindOfClass:[UILabel class]]) {
        // do what you want
    }
}

您还可以遍历 [cell.contentView子视图] array ，并获取所需标签，最好为标签提供 tag 值，并使用 viewWithTag

you can also loop thru the [cell.contentView subviews] array, and get the label you need, better give the label a tag value, and use viewWithTag

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