Trouble creating an instance of ViewController - ios

Question

All,
I have a bar button item on my ViewController. I have set a computed property to will turn the BarButton off. I want to be able to set this from another class.
Here is my code in the view controller :
class ViewController: UIViewController {
var PayButton : Int {
didSet {
navigationItem.leftBarButtonItem = nil
}
}
required init(coder aDecoder: NSCoder)
{
self.PayButton = 0
super.init(coder: aDecoder)
}
When it try and create an instance on the view controller (so I can set the PayButton integer)
let test = ViewController()
I get an error saying
Missing Argument for parameter 'coder' in call
Any ideas ?

Answer 1

It is asking for the parameter 'coder', because you have it in the required init.
To use your code as it stands, you would need to initialise with:
let test = ViewController(coder: NSCoder)
There are several ways to get around this. The easiest would be to remove the required initialiser.
import UIKit
class ViewController: UIViewController {
var PayButton : Int = 0 {
didSet {
navigationItem.leftBarButtonItem = nil
}
}
}
and then implement with
let test = ViewController()
test.PayButton = 0

Answer 2

Because you have implemented the required initializer in ViewController class.
There are two solutions
Add a default initializer
init() {
super.init(nibName: nil, bundle:nil)
}
Remove the required initializer.
class ViewController: UIViewController {
var PayButton : Int {
didSet {
navigationItem.leftBarButtonItem = nil
}
}
init() {
self.PayButton = 0
super.init(nibName: nil, bundle:nil)
}
required init(coder aDecoder: NSCoder)
{
self.PayButton = 0
super.init(coder: aDecoder)
}

Answer 3

Try this:
This is the required initializer:
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
This is the super initializer:
override init(frame: CGRect) {
super.init(frame: frame)
}
This is your convenience initializer where you can pass the size the view you want to create
convenience init(view: UIView){
self.init(frame: view.frame)
}
This is your convenience initializer where the view is initialized with a value pre defined:
convenience init(){
self.init(frame: CGRectZero) //Put you predefined value here
}