Binding.swift

//: Playground - noun: a place where people can play


import UIKit
import PlaygroundSupport

struct User {
    var name: String

    init() {
        name = ""
    }
}

class UserProfile: UILabel {

    var user: User = User() {
        didSet {
            self.text = user.name
        }
    }

}


let container = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 100))
let userProfileView = UserProfile(frame: CGRect(x: 0, y: 0, width: 400, height: 50))
userProfileView.backgroundColor = UIColor.purple
userProfileView.textColor = UIColor.white
userProfileView.textAlignment = .center
container.addSubview(userProfileView)

var user = User()
userProfileView.user = User()
userProfileView.user.name = "Sirst Update"
userProfileView



userProfileView.user.name = "Second Update"
userProfileView
PlaygroundPage.current.liveView = container
PlaygroundPage.current.needsIndefiniteExecution = true