swift, tableView selectedTypes buttons - ios

Question

i need an help, see this class
import UIKit
protocol TypesTableViewControllerDelegate: class {
func typesController(controller: TypesTableViewController, didSelectTypes types: [String])
}
class TypesTableViewController: UITableViewController {
let possibleTypesDictionary = ["bakery":"Bakery", "bar":"Bar", "cafe":"Cafe", "grocery_or_supermarket":"Supermarket", "restaurant":"Restaurant"]
var selectedTypes: [String]!
weak var delegate: TypesTableViewControllerDelegate!
var sortedKeys: [String] {
return possibleTypesDictionary.keys.sort()
}
// MARK: - Actions
#IBAction func donePressed(sender: AnyObject) {
delegate?.typesController(self, didSelectTypes: selectedTypes)
}
// MARK: - Table view data source
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return possibleTypesDictionary.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("TypeCell", forIndexPath: indexPath)
let key = sortedKeys[indexPath.row]
let type = possibleTypesDictionary[key]!
cell.textLabel?.text = type
cell.imageView?.image = UIImage(named: key)
cell.accessoryType = (selectedTypes!).contains(key) ? .Checkmark : .None
return cell
}
// MARK: - Table view delegate
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
let key = sortedKeys[indexPath.row]
if (selectedTypes!).contains(key) {
selectedTypes = selectedTypes.filter({$0 != key})
} else {
selectedTypes.append(key)
}
tableView.reloadData()
}
}
here the user can tap a cell of the tableView so that his prefer types are used on the next viewController for a search, now i need to build a class that do the same thing but there is no a tableview rather only 6 buttons in a view that the user can tap (so a viewController with only 6 different buttons to tap). The problem is that i don't know how to pass to the next viewController what buttons have been pressed and what are not, how can i build this class?
here is the function in the other class that need to know what buttons have been pressed
func fetchNearbyPlaces(coordinate: CLLocationCoordinate2D) {
mapView.clear()
dataProvider.fetchPlacesNearCoordinate(coordinate, radius:searchRadius, types: searchedTypes) { places in
for place: GooglePlace in places {
let marker = PlaceMarker(place: place)
marker.map = self.mapView
where is "types: serchedTypes"

Answer 1

What you wanna do is called delegation here is how you do it:
Make a protocol like this one:
protocol TransferProtocol : class
{
func transferData(types:[String])
}
Make the view controller with the buttons conform to that protocol, I like to do it by adding extensions to my classes like so:
extension ButtonsViewController:TransferProtocol{
func transferData(types:[String]){
//Do whatever you want here
}
}
Declare a variable in your Table View Controller class with the protocol you created as its type, this is called a delegate
weak var transferDelegate:TransferProtocol?
Before you segue to the Buttons View Controller you want to set that view controller as the delegate you just created like so:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let vc = segue.destination as? ButtonsViewController
transferDelegate = vc
vc?.transferData(types: selected)
}
If done correctly you should be able to work with the array you built in the Table View Controller(TypesTableViewController)