Swift - Delegate Protocol Example

Swift Delegate Example.swift

import UIKit

protocol TodoDelegate {
    func sendCompleted(todo: Todo)
}

class Notifications : TodoDelegate {
    var message: String?
    var sent: Bool = false

    init() {
    }
    
    func sendCompleted(todo: Todo) {
        println("Completed: \(todo.task)")
    }

}

class Todo {
    var task: String
    var completed: Bool = false
    var delegate : TodoDelegate?
    init(task_name: String) {
        task = task_name
    }
    func complete() {
        if completed == false {
            completed = true
            delegate?.sendCompleted(self)
        }
    }
}

let del = Notifications()

let td = Todo(task_name: "Get Cheese")
td.delegate = del
td.complete()
let tr = Todo(task_name: "Dont' forget the honey")
tr.delegate = del
tr.complete()