如何在Xcode 5中刪除具有解析數據的單元格？

Question

嗨，我正在使用parse為我的應用程序存儲數據，並希望能夠在向左滑動單元格時將其刪除，盡管當我單擊Delete時，我必須手動下拉並刷新以使數據消失。

無論如何，只要在滑動單元格后單擊“刪除”，就可以使其動畫並消失嗎？

這是我用來刪除ViewController.m單元數據的代碼：

- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
    [super setEditing:editing animated:animated];
    [self.tableView setEditing:editing animated:animated];
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {

    // Remove the row from data model
    PFObject *object = [self.objects objectAtIndex:indexPath.row];
    [object deleteInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        [self refreshControl];
        [tableView reloadData];



    }];
    }
}

提前致謝！

Answer 1

您甚至在不知道數據是否已成功刪除之前就調用了該方法。

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
  if (editingStyle == UITableViewCellEditingStyleDelete) { 
    //try this
    PFObject *object = [self.objects objectAtIndex:indexPath.row];
    [self.objects removeObjectAtIndex:indexPath.row];

    //found the code for removing a row. 
    [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

    // Remove the row from data model
    [object deleteInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
      if (!succeeded){
        //we had an error
        // gives the error log and also how it relates to the user. 
        NSLog(ERROR: %@, %@", error, [error userInfo]);
      }
    }];
  }
}

編輯：嘗試上面編輯過的解決方案。

Answer 2

要使單元正確設置動畫，您需要完成以下任務：

1. 更新后端服務器（解析）模型=刪除單元數據
2. 更新客戶端模型（在本例中為self.objects ）
3. 相應地對單元進行動畫處理

嘗試這個：

- (void)tableView:(UITableView *)tableView
    commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
    forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // 2. Update client model
        [self.objects removeObjectAtIndex:indexPath.row];

        // 3. Animate cells
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
            withRowAnimation:UITableViewRowAnimationFade];

        // 1. Update backend model
        PFObject *object = [self.objects objectAtIndex:indexPath.row]; 
        [object deleteInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
            if (error) {
                // If the backend reports an error, you'd need to readd the cell or
                // display an error message to the user
            }
        }];
    }
}