Working with several view controllers in Swift - ios

Question

I am developing a very simple Swift application programmatically (without storyboards). I have a HomeViewController
import UIKit
class HomeViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func createButton(){
let button = UIButton()
button.setTitle("Start", forState: .Normal)
button.setTitleColor(UIColor.blueColor(), forState: .Normal)
button.frame = CGRectMake(100,200,50,50)
button.addTarget(self, action: "timerPressed:", forControlEvents: .TouchUpInside)
self.view.addSubview(button)
}
}
And I have the following
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let home = HomeViewController()
home.createButton()
}
}
When I call home.createButton() i expect a button to display, but currently it does not. I know the method works because when I moved that createButton() method into the ViewController class it displays the button. Am I missing something with how to properly call the createButton method from within the HomeViewController. Is there a better convention to do what I am trying to do?

Answer 1

class func createButton(controller: UIViewcontroller){
let button = UIButton()
button.setTitle("Start", forState: .Normal)
button.setTitleColor(UIColor.blueColor(), forState: .Normal)
button.frame = CGRectMake(100,200,50,50)
button.addTarget(self, action: "timerPressed:", forControlEvents: .TouchUpInside)
controller.view.addSubview(button)
}
Now call this method to any ViewController
Like This :
HomeViewController.createButton(self).

Answer 2

You can write createButton code under loadview() method of your HomeViewController
class HomeViewController: UIViewController {
override func loadView() {
super.loadView()
let button = UIButton()
button.setTitle("Start", forState: .Normal)
button.setTitleColor(UIColor.blueColor(), forState: .Normal)
button.frame = CGRectMake(100,200,50,50)
button.addTarget(self, action: "timerPressed:", forControlEvents: .TouchUpInside)
self.view.addSubview(button)
}
}
so there is no need to call extra method of HomeViewController to add button as a subview of it.