UITableView callback after row deletion animation complete

Question

I have a table with shadows above the top and below the bottom cell (using Matt Gallagher's solution here: http://cocoawithlove.com/2009/08/adding-shadow-effects-to-uitableview.html). These are added in the layoutSubviews method of the UITableView class extension.

I dynamically add and delete cells below each main cell (these provide additional data) - let's call these "detail" cells. There is only one ever open at a time. When deleting the "detail cell" beneath the last main cell, as the animation begins, the shadow flicks upwards to the last cell (above the detail cell). It does this because the layoutSubview methods considers the last cell of the table to have changed the moment the animation for deleteRowsAtIndexPaths begins (rather than when the animation ends).

So, in essence, I need a way to keep the shadow below the detail cell as its being deleted. Not sure of the best way to do this. If the UITableView no longer considers that cell to be the last cell, then I am not sure even how to get the cell (since the UITableView gets the cell thus):

NSIndexPath *lastRow = [indexPathsForVisibleRows lastObject];
if ([lastRow section] == [self numberOfSections] - 1 &&
    [lastRow row] == [self numberOfRowsInSection:[lastRow section]] - 1)
 {
        //adds shadow below it here
     }

So even trapping the start of the animation is not much use if the UITableView still thinks the main cell above the "detail" cell is the "lastObject".

Thanks for any ideas.

Answer 1

Try this

[CATransaction begin];

[tableView beginUpdates];

//...

[CATransaction setCompletionBlock: ^{
    // Code to be executed upon completion
}];

[tableView deleteRowsAtIndexPaths: indexPaths
                 withRowAnimation: UITableViewRowAnimationAutomatic];


[tableView endUpdates];

[CATransaction commit];