AlertControllerShowsWhenButtonTapped.swift

//
//  ViewController.swift
//  HelloWorld
//
//  Created by Kenny Batista on 1/15/16.
//  Copyright © 2016 Kenny Batista. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
   

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let button = UIButton(type: UIButtonType.System) as UIButton
        button.frame = CGRectMake(100, 100, 100, 100)
        button.backgroundColor = UIColor.redColor()
        button.setTitle("Touch for a hello greeting", forState: .Normal)
        button.addTarget(self, action: "showMessage", forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(button)
    }

    
    func showMessage(){
        //Here we store the UIAlertController object inside of the alertController constant.
        let alertController = UIAlertController(title: "Welcome to my first app", message: "Hello World", preferredStyle: UIAlertControllerStyle.Alert)
        //We add the OK button and it's action for when we tap it.
        alertController.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
        //We pop up the object where the user could see in the interface.
        self.presentViewController(alertController, animated: true, completion: nil)
    }

}