对于rowHeights < 50，UITableView -> trailingSwipeActionsConfigurationForRowAt -> UIContextualAction.image未正确居中

Question

我有一个UITableView，它的最后一列有不同的行高。每一行都有“标记为收藏”和“删除”的UIContextualAction，由图像(图标)表示。它表明，当行高小于50时，UIContextualAction.image放置被破坏，不再正确居中：

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func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        let (training, package) = decodeIndexPath(indexPath)           
        return package?.trainings.last == training ? 50 : 49
    }
    
    
 func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        guard let training = decodeIndexPath(indexPath).0 else { return nil }
        let imageSizeAction = CGSize(width: 30, height: 30)
        var actions = [UIContextualAction]()
        //add delete action (only custom exercises)
        if training.isCustom {
            let deleteAction = UIContextualAction(style: .destructive, title: nil) { [weak self] (action, view, completion) in
                guard let training = self?.decodeIndexPath(indexPath).0 else { return }
            Database.shared.deleteCustom(training: training, completion: logAsError)
                completion(true)
            }
            deleteAction.image = PaintCode.imageOfBtnCellActionDelete(imageSize: imageSizeAction)
            actions.append(deleteAction)
        }
        //add to favorites
        let favoriteAction = UIContextualAction(style: .normal, title: nil) { [weak self] (action, view, completion) in
            guard var training = self?.decodeIndexPath(indexPath).0 else { return }
            training.isFavorite = !training.isFavorite
            tableView.isEditing = false
            completion(true)
        }
        favoriteAction.backgroundColor = PaintCode.mainBlue
        let image = PaintCode.imageOfBtnCellActionFavorite(imageSize: imageSizeAction, selected: training.isFavorite)
        favoriteAction.image = image
        actions.append(favoriteAction)
        let action = UISwipeActionsConfiguration(actions: actions)
        //only allow full swipe if delete is added
        action.performsFirstActionWithFullSwipe = actions.contains(where: {$0.style == .destructive})
        return action
    }

Answer 1

我试着使用backgroundColor和一个patternImage颜色，我能够让它正确地居中，然而，由于平铺操作，当你伸展滑动时，你会得到重复的图标。不是想要的行为

favoriteAction.backgroundColor = UIColor(patternImage: PaintCode.imageOfBtnCellActionFavorite(imageSize:imageSize, selected: training.isFavorite))

因此，我没有看到其他选择，然后有50点的最低高度，使一切都可靠地工作。