UITableView删除和重新加载单元格 [英] UITableView delete and reload cells

问题描述

  [tableView deleteRowsAtIndexPaths：toDelete withRowAnimation：UITableViewRowAnimationAutomatic]; 
  

这会为删除操作添加一个好的动画。

但是，删除后，我需要更新所有当前可见的行。调用

  [tableView reloadData]; 
  

，但是好的动画效果消失了。什么是更好的方法来做到这一点？即动画化删除操作，并更新所有当前可见的行？
谢谢！

我需要这样做的原因是每个单元格都包含一个复选框。我的视图控制器是复选框的委托，每个复选框都有一个NSIndexPath与它相关联。当复选框被切换时，委托被称为告诉它，我们为x索引路径切换。现在，如果一些行被删除，索引路径需要更新。

解决方案

注意： 如评论中所述，很可能此答案无效。如果不接受，我会将其删除。

我不是100％确定这是最好的方式做到这一点，但有一些令人愉快的清洁。在修改底层模型之后，我们可以在常规UIView动画块中封装 reloadData ：

  // if self.people是一个可变数组
 [self.people removeObjectAtIndex：13]; 
 
 [UIView animateWithDuration：0.5 animations：^ {
 [self.tableView reloadData]; 
}]; 
  

I am delete some rows in UITableView like this:

[tableView deleteRowsAtIndexPaths:toDelete withRowAnimation:UITableViewRowAnimationAutomatic];

This adds a nice animation to the delete operation.

However, after deleting I need to update all the currently visible rows. Calling

[tableView reloadData];

right after the first call works, but the nice animation effect is gone. What's a better way to do this? i.e., to animate the delete operation, and update all the currently visible rows? Thanks!

The reason why I need to do this is because each cell contains a 'checkbox'. My view controller is checkbox's delegate and each checkbox has an NSIndexPath associated with it. When the checkbox is toggled, delegate is called telling it hey we toggled for x index path. Now, if some rows are deleted, the index paths need to be update. That's why I need to reload everything so each checkbox knows where it belongs.

解决方案

Note: As noted in comments, it is likely that this answer will not work. If it were not accepted, I would delete it.

I'm not 100% sure that this is the best way to do this, but there is something pleasantly clean about it. We can wrap reloadData in a regular UIView animation block after modifying the underlying model:

// if self.people is a mutable array
[self.people removeObjectAtIndex:13];

[UIView animateWithDuration:0.5 animations:^{
  [self.tableView reloadData];
}];

这篇关于UITableView删除和重新加载单元格的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！