在UITableview上仅重新加载一个UITableViewCell

问题描述

好的伙计们，这就是我的情况。

Ok Guys, here's the situation I have.

我正在使用带有核心数据的UITableViewController。该表有大约200个单元格，基本上用作清单。当你点击一个单元格时，那个单元格有一个被切换的复选框设置为UITableViewCell.imageView（分配给标签左边的UIImageView）。

I'm using a UITableViewController with Core Data. The table has about 200 cells, that basically function as a checklist. When you tap a cell, that cell has a checkbox that gets toggled set to the UITableViewCell.imageView ( the UIImageView assigned to the left of the label).

我随时使用下面两种方式中的任何一种来更新表，更新大约需要1到2秒......而且据我所知，它似乎正在重新加载每个单元格。如何强制只更新刚刚被点击的单元格？

Anytime I use either of the two ways below to update the table, it takes about 1 - 2 seconds for the update ... and from what I can tell, it seems to be reloading every cell. How can I force only the cell that was just tapped to be updated?

[self.tableView reloadData]; 或

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
           atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {

    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:NO];
            break;

        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:NO];
            break;
    }
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath {

    UITableView *tableView = self.tableView;

    switch(type) {

        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
                             withRowAnimation:NO];
            break;

        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                             withRowAnimation:NO];
            break;

        case NSFetchedResultsChangeUpdate:
            [self configureCell:[tableView cellForRowAtIndexPath:indexPath]
                    atIndexPath:indexPath];
            break;

        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                             withRowAnimation:NO];
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
                             withRowAnimation:NO];
            break;
    }
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView endUpdates];
}

推荐答案

你需要这个：

- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation

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