Question

I am working on UITableView. My application works fine with iOS 4 devices, but when I install the same app on an iOS 5 device, the UITableView method [tableView beginUpdates] and [tableView endUpdates] does not perform the required task.

Any ideas of what the problem is?

Answer 1

There are two things I’m seeing in your code, you are not actually inserting/deleting any new row in your UITableView and the beginAnimations block is only used for that purpose. From the doc:

beginUpdates Begin a series of method calls that insert, delete, or
select rows and sections of the receiver.

• (void)beginUpdates Discussion Call this method if you want subsequent insertions, deletion, and selection operations (for
  example, cellForRowAtIndexPath: and indexPathsForVisibleRows) to be
  animated simultaneously. This group of methods must conclude with an
  invocation of endUpdates. These method pairs can be nested. If you do
  not make the insertion, deletion, and selection calls inside this
  block, table attributes such as row count might become invalid. You
  should not call reloadData within the group; if you call this method
  within the group, you will need to perform any animations yourself.

The second things that I’m seeing is that you are also using animation blocks that are now discouraged in the documentation:

Animating Views
Use of the methods in this section is discouraged in iOS 4 and later. Use the block-based animation methods instead.

What I would try is to move to the new code with a conditional statement, depending on the iOS version where your app is running.