UITableView row animation duration and completion callback

Question

Is there a way to either specify the duration for UITableView row animations, or to get a callback when the animation completes?

What I would like to do is flash the scroll indicators after the animation completes. Doing the flash before then doesn't do anything. So far the workaround I have is to delay half a second (that seems to be the default animation duration), i.e.:

[self.tableView insertRowsAtIndexPaths:newRows
                      withRowAnimation:UITableViewRowAnimationFade];
[self.tableView performSelector:@selector(flashScrollIndicators)
                     withObject:nil
                     afterDelay:0.5];

Answer 1

Just came across this. Here's how to do it:

Objective-C

[CATransaction begin];
[tableView beginUpdates];
[CATransaction setCompletionBlock: ^{
    // Code to be executed upon completion
}];
[tableView insertRowsAtIndexPaths: indexPaths
                 withRowAnimation: UITableViewRowAnimationAutomatic];
[tableView endUpdates];
[CATransaction commit];

Swift

CATransaction.begin()
tableView.beginUpdates()
CATransaction.setCompletionBlock {
    // Code to be executed upon completion
}
tableView.insertRowsAtIndexPaths(indexArray, withRowAnimation: .Top)
tableView.endUpdates()
CATransaction.commit()