Passing an icon and name from TableviewController B to TableviewController A - ios

Question

I am trying to pass an icon and a name from tableview Controller B to view controller A via a delegate.
To put this simple, a user is presented with ViewController A: (Shown here)
ViewController A and source code
ViewController A source
//
// MasterTableViewController.swift
// Sample image
//
//
import UIKit
class MasterTableViewController: UITableViewController, IconselectedDelegate {
#IBOutlet weak var passedIconName: UILabel!
var tempname: String?
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Master"
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(true)
}
func iconName(iconName: String) -> String {
self.tempname = iconName
self.passedIconName.text = "\(iconName)"
return tempname!
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
So when when the user taps this cell, the user is then presented with another view controller (viewController B) that shows a list of icons. Here is the Screenshot and source code for this sample.
ViewController B
Here is the sample code for Viewcontroller B
ViewController B code
//
// IconTableViewController.swift
// Sample image
//
// Created by me on 4/18/16.
//
import UIKit
protocol IconselectedDelegate {
func iconName(iconName: String)-> String
}
class IconTableViewController: UITableViewController {
enum Icon: Int {
case Study
case Apple
var icon: UIImage {
switch self {
case.Study: return UIImage(named: "study")!
case.Apple: return UIImage(named: "apple")!
}
}
}
var icons = ["Study", "Apple"]
var delegate: IconselectedDelegate? = nil
var selectedIndex = 0
// holding vars
var image: UIImage?
var name: String?
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Icon selection"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return icons.count
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let cell: UITableViewCell! = tableView.cellForRowAtIndexPath(indexPath)
if cell.accessoryType == UITableViewCellAccessoryType.None {
if indexPath.row == 0 {
self.name = icons[0]
} else if indexPath.row == 1 {
self.name = icons[1]
}
cell.accessoryType = UITableViewCellAccessoryType.Checkmark
self.navigationController?.popToRootViewControllerAnimated(true)
}
selectedIndex = indexPath.row
tableView.reloadData()
tableView.deselectRowAtIndexPath(indexPath, animated: true)
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellIdentifier = "Cell"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! IconTableViewCell
// Configure the cell...
cell.iconName.text = icons[indexPath.row]
if let iconIndex = Icon(rawValue: indexPath.row) {
cell.iconPreview.image = iconIndex.icon
}
return cell
}
override func viewWillDisappear(animated: Bool) {
super.viewWillAppear(true)
if name == nil {
delegate?.iconName("None")
} else {
delegate?.iconName(name!)
print("Delegate left with \(delegate?.iconName(name!))")
}
}
}
PROBLEM
I want to pass the selected icon back to the master view controller showing both the name and the icon image. (In master view controller, there is a UIImage object but you can't see it right next to the UILable saying 'select')
How can i achieve this? I used this similar code for accomplishing UIColor and it worked but it does not seem to work with images.
Would greatly help

Answer 1

Set values from your DestinationViewController back to your Primary (First) ViewController
1. Implement a protocol, for example create a file called protocol.swift.
protocol SetIconValueDelegate {
func didChoose(icon:Icon)
}
2. set the delegate on your second ViewController
class yourNextViewControllerClass {
var delegate:SetIconValueDelegate?
3. set the delegate when you load your secondViewController (with Icon Details)
if(segue.identifier == "yourIdentifierInStoryboard") {
var yourNextViewController = (segue.destinationViewController as yourNextViewControllerClass)
yourNextViewController.delegate = self
4. add Function to FirstViewController
func didChoose(icon:Icon) {
// set here whatever you want
}
5. call this function from your SecondViewController
delegate?.didChoose(icon) // this will send your "icon" object - run this from didSelectRowAtIndexPath
6. Set the delegate in your FirstViewController
class FirstViewController: UIViewController, setIconValueDelegate {

Answer 2

You can use delegate(protocol) methods to send back data to previous view controller.
IN CURRENT VC:
protocol MyProtocol: class
{
func sendArrayToPreviousVC(myArray:[AnyObject])
}
Make a var in your class.
weak var mDelegate:MyProtocol?
Now call the protocol method when you pop the view controller, with your "properties" array as parameter. (in your case from did select row pass what you want like icon or name)
mDelegate?.sendArrayToPreviousVC(properties)
IN PREVIOUS VC:
In your previous VC, set the mDelegate property to self, when you push the current VC.
currentVC.mDelegate = self
//PUSH VC
Now implement the protocol method in your previous VC.
func sendArrayToPreviousVC(myArray:[AnyObject]) {
//DO YOUR THING
}
This is the scenario that how can send data back in navigation stack. adjust according to your data and requirement.
You should use didselect row delegate method to pass data.
hope this will help :)