Hide unhide Static Table View Cells with Swift

Question

I am trying to make a '''Static Table''' with some cells that are expandable and collapsing . I override the ''': WithAnimation:)''' which should provide me some control on the animation transition. Unfortunately, the cells returned are blank, I don't mean empty, but the cells have disappeared and their location is left blanc in the table. When I try using the '''reloadSections( )''' rather, the whole section is also returned blank. After some recherche , I start to suspect that '''reloadRowAtIndexPath(​: WithAnimation:)''' and '''reloadSections( )''' works with table associated with a data source. Am I right? If yes, how can I control animation of the cell I want to hide/unhide so that the transition is smooth? Thanks (edited)

Answer 1

To get a smooth animation, simply reload the tableView with

tableView.beginUpdates()
tableView.endUpdates()

this will call the heightForRowAtIndexPath automatically and render a smooth transition.

Answer 2

To expand on irkinosor's answer. In this example I have 1 section with 3 static rows. When tableView is initially loaded, my UISwitch is off and I only want the first row (row 0) be visible (hide rows 1,2). When the UISwitch is on, I want to show (rows 1,2). Also, I want smooth animation having the rows accordion to hide or show.

override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

    if indexPath.row > 0 && toggleSwitch.isOn == false {
        return 0.0  // collapsed
    }
    // expanded with row height of parent
    return super.tableView(tableView, heightForRowAt: indexPath)
}

In my switch action I initiate the tableView refresh

@IBAction func reminderSwitch(_ sender: UISwitch) {
    // to initiate smooth animation
    tableView.beginUpdates()
    tableView.endUpdates()
}

You can obviously add more logic to the heightForRowAt function if you have multiple sections and more interesting row requirements.