如何从 UIButton 操作方法获取 UITableViewCell 对象? [英] How can I get UITableViewCell object from a UIButton action method?

问题描述

我有一个 UITableView，其中我为每个单元格添加了一个 UIButton 作为附件视图.请注意，我将按钮的标签设置为当前行以备将来使用.

I have a UITableView in which I have added a UIButton as accessory view for each cell. Note that I set the tag of the button as current row for future use.

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

    // Configure the cell...

    if(cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];

        cellButton = [UIButton buttonWithType:UIButtonTypeCustom];
        cellButton.frame = CGRectMake(0, 0, 30, 30);  

        [cellButton setBackgroundImage:[UIImage imageNamed:@"cellButton.png"] forState:UIControlStateNormal];        
        [cellButton addTarget:self action:@selector(cellButtonAction:) forControlEvents:UIControlEventTouchUpInside];


        cellButton.tag = indexPath.row;  // <= Will use this in the next method
        cell.accessoryView = cellButton;
    }


    //Load cell with row based data

    return cell;
}

现在，当点击这些按钮之一时，我需要对单元格进行更改.所以我实现了 cellButtonAction ，在那里我使用标签来取回单元格:

Now when one of these buttons is tapped, I need to make changes to the cell. So I implement cellButtonAction where I use the tag to get back the cell:

-(void)editCommentButtonAction:(id)sender
{
    UIButton *button = sender;
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:button.tag inSection:0];
    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
    [self makeChangesToCell:cell];  
}

但这似乎是一种非常迂回的方式.有没有更干净的方法来做到这一点?

But this seems like a very round about way. Is there a cleaner way to do this?

推荐答案

所以假设按钮直接在contentView中:

So assuming that the button is in the contentView directly:

• 询问sender"(即按钮)的superview，即cell的contentView

• ask "sender" (ie the button) for its superview, which is the cell's contentView

请求该视图的superView，即单元格

ask that view for its superView, which is the cell

向 tabview 询问这个单元格的索引:

ask the tabview for the index of this cell:

- (NSIndexPath *)indexPathForCell:(UITableViewCell *)cell

实际上，我现在使用一种通用方法或函数，它只是向上走超级视图，寻找KindOf"、UITableViewCell 或 UICollectionViewCell 的视图.像冠军一样工作！

Actually, I use a general purpose method or function now that just walks up the superviews, looking for a view that is 'KindOf' a UITableViewCell or a UICollectionViewCell. Works like a champ!

Swift 中的代码:

The code in Swift:

func containingUITableViewCell(tableView: UITableView, var view: UIView) -> (UITableViewCell, NSIndexPath)? {
while let v = view.superview {
    view = v
    if view.isKindOfClass(UITableViewCell.self) {
        if let cell = view as? UITableViewCell, let indexPath = tableView.indexPathForCell(cell) {
            return (cell, indexPath)
        } else {
            return nil
        }
    }
}
return nil

}

func containingUICollectionViewCell(collectionView: UICollectionView, var view: UIView) -> (UICollectionViewCell, NSIndexPath)? {
    while let v = view.superview {
        view = v
        if view.isKindOfClass(UICollectionViewCell.self) {
            if let cell = view as? UICollectionViewCell, let indexPath = collectionView.indexPathForCell(cell) {
                return (cell, indexPath)
            } else {
                return nil
            }
        }
    }
    return nil
}

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