Trigger updates via. property observer

Dispatcher_Sensor.swift

// embed in the target (note props are read only)
protocol MySensor {
    var name: String { get }
    var age: Int { get }
}

// an example target that holds sensor
protocol MyView {
    var sensor: MySensor { get set }
}

// dispatcher implements sensor
class Dispatcher: MySensor {
    var name: String = "John"
    var age: Int = 20
}

class ConcreteView: MyView {
    var sensor: MySensor {
        didSet {
            // this gets triggered when presenter updates
            render(name: sensor.name, age: sensor.age)
        }
    }
    
    init(sensor: MySensor) {
        self.sensor = sensor
    }
    
    func render(name: String, age: Int) {
        print("name: \(name), age: \(age)")
    }
}

class Presenter {
    var view: MyView
    // source holds dispatcher with read write acess
    var dispatcher: Dispatcher
    
    init() {
        self.dispatcher = Dispatcher()
        self.view = ConcreteView(sensor: dispatcher)
    }
    
    func updateState(name: String, age: Int) {
        // update state
        dispatcher.name = name
        dispatcher.age = age
        // trigger update by reseting the sensor
        view.sensor = dispatcher
    }
}

var presenter = Presenter()
// we update the state triggering the sensor in the view to render
presenter.updateState(name: "Bob", age: 30) // name: Bob, age: 30