Return Checkmark after using UISearchBar - Swift - ios

Question

I've created a UISearchBar App using this tutorial. Everything works fine, the cells are configured correctly, and I am able to search by username.
Now I am trying to add a (checkmark ✔︎) to each cell, allowing me to (select ✔︎) multiple users in a list.
The functionality works fine, but when I search the list, (select ✔︎) a user, and return to the main tableview, the user DOES NOT remain selected and vice-versa.
How can I (checkmark ✔︎) multiple users and maintain that checkmark before or after I use the UISearchBar?
class InviteViewController: UITableViewController, UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate, UISearchDisplayDelegate {
var allFriends = [Friend]()
var filteredFriends = [Friend]()
override func viewDidLoad() {
super.viewDidLoad()
###Call to get all Friends
getFriends()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if tableView == self.searchDisplayController!.searchResultsTableView {
return self.filteredFriends.count
} else {
return self.allFriends.count
}
}
var selectedFriendIndex:Int? = nil
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("Cell") as! UITableViewCell
var friend : Friend
if tableView == self.searchDisplayController!.searchResultsTableView {
friend = filteredFriends[indexPath.row]
} else {
friend = allFriends[indexPath.row]
}
###Configure the cell
cell.textLabel!.text = friend.username
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
if (indexPath.row == selectedFriendIndex) {
cell.accessoryType = UITableViewCellAccessoryType.Checkmark
} else {
cell.accessoryType = UITableViewCellAccessoryType.None
}
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
selectedFriendIndex = indexPath.row
let cell = tableView.cellForRowAtIndexPath(indexPath)
if let index = selectedFriendIndex {
if (cell?.accessoryType == .Checkmark) {
cell!.accessoryType = .None
} else {
cell!.accessoryType = .Checkmark
}
}
}
func filterContentForSearchText(searchText: String, scope: String = "All") {
self.filteredFriends = self.allFriends.filter({( friend : Friend) -> Bool in
var usernameMatch = (scope == "All") || (friend.username == scope)
var stringMatch = friend.username.lowercaseString.rangeOfString(searchText.lowercaseString)
return usernameMatch && (stringMatch != nil)
})
}
func searchDisplayController(controller: UISearchDisplayController, shouldReloadTableForSearchString searchString: String!) -> Bool {
self.filterContentForSearchText(searchString)
return true
}
func searchDisplayController(controller: UISearchDisplayController, shouldReloadTableForSearchScope searchOption: Int) -> Bool {
self.filterContentForSearchText(self.searchDisplayController!.searchBar.text)
return true
}
func searchDisplayController(controller: UISearchDisplayController, willHideSearchResultsTableView tableView: UITableView) {
self.tableView.reloadData()
}
}

Answer 1

You need to keep track of what friends are selected in (an array in) your model.
You could add a Bool for each friend, indicating whether they are selected.
This will preserve the selection information when you search and return.

Answer 2

You will need to add a Bool variable to your object and set it to true or false.
contact.addToGroup = false
Swift 3 example:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if let cell = tableView.cellForRow(at: indexPath) {
let contact = contacts[indexPath.row]
if (cell.accessoryType == .checkmark) {
cell.accessoryType = .none
contact.addToGroup = false
} else {
cell.accessoryType = .checkmark
contact.addToGroup = true
}
}
tableView.deselectRow(at: indexPath, animated: true)
}