UITableView Multiple Selection

Question

How can I add a UITableView into my View-Based Application where the user will tap on more than one cell, and it will become selected, exactly like the Clock app's "New Alarm" setting named "Repeat" (Clock>Alarms> + >Repeat), and how can I get all of the selected cells in an array?

Answer 1

For multiple selection, add the line below in viewDidLoad()

tableView.allowsMultipleSelection = true 

Configure each cell after dequeuing (or initializing) it in tableView(_:cellForRowAt:)

let selectedIndexPaths = tableView.indexPathsForSelectedRows let rowIsSelected = selectedIndexPaths != nil && selectedIndexPaths!.contains(indexPath) cell.accessoryType = rowIsSelected ? .checkmark : .none // cell.accessoryView.hidden = !rowIsSelected // if using a custom image 

Update each cell when it's selected/deselected

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {     let cell = tableView.cellForRow(at: indexPath)!     cell.accessoryType = .checkmark     // cell.accessoryView.hidden = false // if using a custom image }  override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {     let cell = tableView.cellForRow(at: indexPath)!     cell.accessoryType = .none     // cell.accessoryView.hidden = true  // if using a custom image } 

When you're done, get an array of all the selected rows

let selectedRows = tableView.indexPathsForSelectedRows 

and get the selected data, where dataArray maps to the rows of a table view with only 1 section

let selectedData = selectedRows?.map { dataArray[$0.row].ID } 

Answer 2

In your implementation of -tableView:didSelectRowAtIndexPath: you would set the table view cell's accessoryType property depending on its current value (so it would toggle on and off with multiple taps). For example:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)path {     UITableViewCell *cell = [tableView cellForRowAtIndexPath:path];      if (cell.accessoryType == UITableViewCellAccessoryCheckmark) {         cell.accessoryType = UITableViewCellAccessoryNone;     } else {         cell.accessoryType = UITableViewCellAccessoryCheckmark;     } } 

You could either maintain an array of selected states in addition to the cells' own accessory type state, or iterate over the cells in the table view querying for each one's state in order to read out the selected rows.