Swift Playground

swift.swift

//: A UIKit based Playground for presenting user interface

import UIKit
import PlaygroundSupport

class CounterModule: NSObject {
    var name = "momo"
    @objc dynamic var count = Int(0)
    
    func increment() -> Void{
        count = count + 1
    }
    func decrement() -> Void{
        count = count - 1
    }
}

class AppState {
    
}

class Controller {
    var appState = AppState()
    var counterModule = CounterModule()
    var state = AppState()
}

var controller = Controller()
var c = controller
var s = controller.state

class MyViewController : UIViewController {
    
    @objc var objectToObserve = c.counterModule
    var observation: NSKeyValueObservation?
    var observations: [NSKeyValueObservation]?
    let label2 = UILabel()
    let label = UILabel()
    
    var observers = [NSKeyValueObservation]()
    
    func observeModel() {
        self.observers = [
            observe( \.objectToObserve.count, options: [.old, .new]) { (model, change) in
                self.label.text = String(change.newValue!)
            },
            observe( \.objectToObserve.count, options: [.old, .new]) { (model, change) in
                self.label2.text = String(change.newValue!)
            }
        ]
    }
    
    override func loadView() {
        let view = UIView()
        view.backgroundColor = .white
        
//        let label2 = UILabel()
        label2.frame = CGRect(x: 150, y: 500, width: 200, height: 20)
        label2.text = String(controller.counterModule.count)
        label2.textColor = .black
        view.addSubview(label2)
        
//        let label = UILabel()
        label.frame = CGRect(x: 150, y: 200, width: 200, height: 20)
        label.text = "Hello World!" + controller.counterModule.name
        label.textColor = .black
        view.addSubview(label)
        
        
        let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
        button.backgroundColor = .green
        button.setTitle("Test Button", for: .normal)
        button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
        view.addSubview(button)
        
        observeModel()
        self.view = view
    }
    @objc func buttonAction(sender: UIButton!) {
        controller.counterModule.increment()
        print("Button tapped", controller.counterModule.count)
    }
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()