在 iOS 11 之前，我們使用：
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]?
來對 Cell 的滑動手勢出現(xiàn)的按鈕進(jìn)行自定義倦逐。
如下圖：

    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
        
        let deleteAction = UITableViewRowAction(style: .destructive, title: "刪除") { (action, indexPath) in
            self.titles.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: .left)
        }
        
        let archiveAction = UITableViewRowAction(style: .normal, title: "歸檔") { (action, indexPath) in
            
        }
        
        return [deleteAction, archiveAction]
    }

而在 iOS 11 之前，非常希望能實(shí)現(xiàn)系統(tǒng)那樣直接一滑到底刪除某個 Cell 的效果牲证。
現(xiàn)在男窟，從 iOS 11 開始提供了新的代理方法，并且在未來將要取代
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]?
這個用了很久的方法蒿囤。

新的方法提供了：左側(cè)按鈕自定義客们、右側(cè)按鈕自定義、自定義圖片材诽、背景顏色底挫，通過 UIContextualAction 來設(shè)置。

    // 左側(cè)按鈕自定義
    func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        
        let leftAction = UIContextualAction(style: .normal, title: "左側(cè)") { (action, view, finished) in
            
            finished(true)
        }
        
        
        return UISwipeActionsConfiguration(actions: [leftAction])
    }
    
    // 右側(cè)按鈕自定義
    func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        
        let deleteAction = UIContextualAction(style: .destructive, title: "刪除") { (action, view, finished) in
            
            self.titles.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: .automatic)

            // 回調(diào)告知執(zhí)行成功脸侥，否則不會刪除此行＝ǖ恕！睁枕！
            finished(true)
        }
        
        
        let archiveAction = UIContextualAction(style: .normal, title: "歸檔") { (action, view, finished) in
            
        }
        
        
        return UISwipeActionsConfiguration(actions: [deleteAction, archiveAction])
    }

Objective-C

- (nullable UISwipeActionsConfiguration *)tableView:(UITableView *)tableView trailingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    UIContextualAction *deleteAction = [UIContextualAction
                                        contextualActionWithStyle:UIContextualActionStyleDestructive
                                        title:@"刪除"
                                        handler:^(UIContextualAction * _Nonnull action,
                                                  __kindof UIView * _Nonnull sourceView,
                                                  void (^ _Nonnull completionHandler)(BOOL))
    {
        [self.titles removeObjectAtIndex:indexPath.row];
        
        [self.tableView deleteRowsAtIndexPaths: [NSArray arrayWithObjects:indexPath, nil] withRowAnimation:UITableViewRowAnimationAutomatic];
        
        completionHandler(true);
    }];
    
    // 設(shè)置按鈕圖片
    [deleteAction setImage:[UIImage imageNamed:@"Star"]];
    
    
    NSArray *actions = [[NSArray alloc] initWithObjects:deleteAction, nil];
    
    return [UISwipeActionsConfiguration configurationWithActions:actions];
}