Data between ContainerView and ViewController - ios

Question

I want to pass data between my container view and my viewcontroller. Then, I click on the button the label text should be change. The button is in the container view and the label text in the viewcontroller. I tried some solutions here on Stack Overflow but nothing seems to working, or I'm doing it wrong maybe.
Can anyone help?
Gamecontroller.swift
#objc func buttonMove(_ sender:UIButton!) {
print("Button tapped" + String(pointsGame))
let buttonWidth = sender.frame.width;
let buttonHeight = sender.frame.height;
let viewWidth = sender.superview!.bounds.width
let viewHeight = sender.superview!.bounds.height
let xwidth = viewWidth - buttonWidth
let yheight = viewHeight - buttonHeight
let xoffset = CGFloat(arc4random_uniform(UInt32(xwidth)))
let yoffset = CGFloat(arc4random_uniform(UInt32(yheight)))
sender.center.x = xoffset + buttonWidth / 2
sender.center.y = yoffset + buttonHeight / 2
pointsGame = pointsGame + 1
}
override func prepare(for segue: UIStoryboardSegue,sender: Any?) {
if segue.identifier == "game" {
let vc = segue.destination as! ViewController
vc.gpoints = pointsGame
}
View controller:
class ViewController: UIViewController {
#IBOutlet weak var points: UILabel!
var gpoints: Int!
override func viewDidLoad() {
super.viewDidLoad()
gpoints = 0
points.text = String(gpoints)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

Gamecontroller.swift
////// declare object first
var vc = ViewController()
#objc func buttonMove(_ sender:UIButton!) {
print("Button tapped" + String(pointsGame))
let buttonWidth = sender.frame.width;
let buttonHeight = sender.frame.height;
let viewWidth = sender.superview!.bounds.width
let viewHeight = sender.superview!.bounds.height
let xwidth = viewWidth - buttonWidth
let yheight = viewHeight - buttonHeight
let xoffset = CGFloat(arc4random_uniform(UInt32(xwidth)))
let yoffset = CGFloat(arc4random_uniform(UInt32(yheight)))
sender.center.x = xoffset + buttonWidth / 2
sender.center.y = yoffset + buttonHeight / 2
pointsGame = pointsGame + 1
vc.refreshView((points : pointsGame)
}
override func prepare(for segue: UIStoryboardSegue,sender: Any?) {
if segue.identifier == "game" {
vc = segue.destination as! ViewController
vc.gpoints = pointsGame
}
View controller:
class ViewController: UIViewController {
#IBOutlet weak var points: UILabel!
var gpoints: Int!
override func viewDidLoad() {
super.viewDidLoad()
gpoints = 0
}
func refreshView(points : Int! )
{
points.text = String(points)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 2

Its not a good Approach to use viewController globally, Best way is to use delegates or notifications.Here is notification example when you Tap on button just post notification after pointsGame = pointsGame + 1
// Post notification
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "buttonpressed"), object: nil , userInfo: ["points": 20])
And in View controller ViewDidLoad add observer for notification
let name = Notification.Name("buttonpressed")
NotificationCenter.default.addObserver(self, selector: #selector(refreshLabel(object:)), name: name, object: nil)
func refreshLabel(_ notification: Notification) {
if let myDict = notification.object as? [String: Any] {
if let point = myDict["points"] as? Int {
print(point)
points.text = String(point)
}
}

Answer 3

Step 1: Create One Variable of your container view controller.
var templateVC : GPTemplateVC?
Step 2: In Prepare for a segue do this.
if segue.identifier == "embedSegueTemplateVC" {
templateVC = segue.destination as? GPTemplateVC
}
Then you can access every element from the ContainerVC.
You can also use a delegate for the same.
Just confirm your delegate with your main view controller and call delegate method using delegate object in Container view controller. In your case call it on button click.