Best way to update a table view after deleting a row with animation?

user_2533448 0
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I have a table view that displays the cell index in a label, so the table view might look something like:

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1
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4

I want to let the user delete a cell with an animation using:

tbl.deleteRows(at: [IndexPath(row: idx, section: 0)], with: .automatic)

But the problem is, then the other cells don't update their index labels after the animation. So if for example I deleted index 1, then after the delete animation is completed, the table ends up looking like:

0
2
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What's the best way to reload the table view after the delete animation, since deleteRows doesn't have a completion callback?

I'm not interested in just calling tbl.reloadData() in place of tbl.deleteRows(...) since I am interested in the delete animation.

Thanks

swift uitableview
1 Answers

You can use the performBatchUpdates of UITableView and update the other rows upon completion:

tbl.performBatchUpdates({
    self.tbl.deleteRows(at: [IndexPath(row: idx, section: 0)], with: .automatic)
}, completion: { (done) in
    let indexPathsToUpdate = (idx...self.tbl.numberOfRows(inSection: 0)).map { IndexPath(row: $0, section: 0) }
    self.tbl.reloadRows(at: indexPathsToUpdate, with: .none)
})

Or can also perform these operations with beginUpdates and endUpdates and the animations will happen simultaneously:

let indexPathsToUpdate = (idx+1...tbl.numberOfRows(inSection: 0)).map { IndexPath(row: $0, section: 0) }
tbl.beginUpdates()
tbl.deleteRows(at: [IndexPath(row: tbl, section: 0)], with: .automatic)
tbl.reloadSections(IndexSet(integersIn: 0...0), with: .none)
tbl.endUpdates()

Please note I used reloadRows(at: indexPathsToUpdate, with: .none) with animation .none as suggested, but it's up to you the way you would like them to be update, using some animation or not.

user_5645320
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