Change only one specific tableView row height [duplicate] - swift

Question

This question already has answers here:
How to increase the single row height without reloading UITableView or individual cells [Swift]?
(6 answers)
Closed 3 years ago.
I'm looking for a way to change a specific row in my tableView.
I'm using a Notification to check when I do an action in my cell. According to the answer, my goal is to display the next row.
By default, my cell have this property.
if (indexPath.row == 5){
tableView.rowHeight = 0.0
}
if (indexPath.row == 6){
tableView.rowHeight = 0.0
}
return cell
My goal when I'm in my notification is to change the row height value for the fifth row.
Thank you for your help

Answer 1

You could use a Set<IndexPath> and your tableView delegate methods to achieve this.
Say you have a set of selected index paths selectedIndexPaths and heights largeHeight and normalHeight. Your heightForRow func could look like this:
func tableView(_ tableView: UITableView, heigthForRowAt indexPath: IndexPath) -> CGFloat {
guard !selectedIndexPaths.contains(indexPath) else {
return largeHeight
}
return normalHeight
}
Then you could change the height dynamically the following way:
/// Convenience method for selecting an index path
func select(indexPath: IndexPath, completion: ((Bool) -> Void)? = nil){
selectedIndexPaths.insert(indexPath)
tableView.performBatchUpdates({
self.tableView.reloadRows(at: [indexPath], with: .none)
}, completion: completion)
}
In your tableView delegate, you could call this method in didSelect:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
select(indexPath: indexPath)
}
Do the same if you have a method responding to your notification (assuming you placed your indexPath in your notification's userInfo, under the key "indexPathKey"):
func notifiedShouldEnlargeRow(aNotification: Notification) {
guard let indexPath = aNotification.userInfo["indexPathKey"] as? IndexPath else { return }
select(indexPath: indexPath)
}
For reference, look at performBatchUpdates(_:completion) and reloadRows(at:with:).