updating classes in swift - ios

Question

I am looking for a solution to my problem. I have a class that creates a UIButton for me:
class MenuButton: UIButton {
var x: CGFloat
var y: CGFloat
var width: CGFloat
var height: CGFloat
required init(parent: UIView = UIView(), x: CGFloat = 0, y: CGFloat = 0, width: CGFloat = 40, height: CGFloat = 40) {
self.x = x
self.y = y
self.width = width
self.height = height
super.init(frame: .zero)
frame = CGRect(x: x, y: y, width: width, height: height)
backgroundColor = global.labelColor
setTitleColor(#colorLiteral(red: 0, green: 0, blue: 0, alpha: 1), for: .normal)
layer.cornerRadius = self.frame.height / 2
if x < 0 {
frame = CGRect(x: superview?.frame.width ?? 0 - abs(x) - frame.width, y: frame.minY, width: frame.width, height: frame.height)
}
if y < 0 {
frame = CGRect(x: frame.minX, y: superview?.frame.height ?? 0 - abs(y) - frame.height, width: frame.width, height: frame.height)
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Then I add a constant that is assigned to this class:
let pauseButton = MenuButton()
This works fine and the button is shown on the scene with everything to default. Now I want to add those things in the viewDidLoad() (I added the subview to acces it in the class):
view.addSubview(pauseButton)
pauseButton.x = -20
pauseButton.y = 20
pauseButton.width = 40
pauseButton.height = 40
This does not update the stuff I specified in the init(). How do I call the init again (without doing pauseButton = MenuButton() again) or is there like an update() I can use?
Thank you for your help ;)

Answer 1

You can actually pass those values in the initializer as below,
let pauseButton = MenuButton(parent: view, x: -20, y: 20, width: 40, height: 40)
If you want to make your button update immediately as you change any of these properties then you can use didSet callback to set the frame as below,
class MenuButton: UIButton {
var x: CGFloat {
didSet {
self.updateFrame()
}
}
var y: CGFloat {
didSet {
self.updateFrame()
}
}
var width: CGFloat {
didSet {
self.updateFrame()
}
}
var height: CGFloat {
didSet {
self.updateFrame()
}
}
private func updateFrame() {
frame = CGRect(x: x, y: y, width: width, height: height)
}
required init(parent: UIView = UIView(), x: CGFloat = 0, y: CGFloat = 0, width: CGFloat = 40, height: CGFloat = 40) {
self.x = x
self.y = y
self.width = width
self.height = height
super.init(frame: .zero)
frame = CGRect(x: x, y: y, width: width, height: height)
backgroundColor = .green
setTitleColor(#colorLiteral(red: 0, green: 0, blue: 0, alpha: 1), for: .normal)
layer.cornerRadius = self.frame.height / 2
if x < 0 {
frame = CGRect(x: superview?.frame.width ?? 0 - abs(x) - frame.width, y: frame.minY, width: frame.width, height: frame.height)
}
if y < 0 {
frame = CGRect(x: frame.minX, y: superview?.frame.height ?? 0 - abs(y) - frame.height, width: frame.width, height: frame.height)
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}

Answer 2

each UIViewController have UIView accessed inside of it as view
you are adding the subview already here.
view.addSubview(pauseButton)
so just pass it into the init() you have and add it there.
your code could be something like this.
class MenuButton: UIButton {
var x: CGFloat
var y: CGFloat
var width: CGFloat
var height: CGFloat
required init(parent: UIView = UIView(), x: CGFloat = 0, y: CGFloat = 0, width: CGFloat = 40, height: CGFloat = 40) {
self.x = x
self.y = y
self.width = width
self.height = height
super.init(frame: .zero)
frame = CGRect(x: x, y: y, width: width, height: height)
backgroundColor = global.labelColor
setTitleColor(#colorLiteral(red: 0, green: 0, blue: 0, alpha: 1), for: .normal)
layer.cornerRadius = self.frame.height / 2
if x < 0 {
frame = CGRect(x: superview?.frame.width ?? 0 - abs(x) - frame.width, y: frame.minY, width: frame.width, height: frame.height)
}
if y < 0 {
frame = CGRect(x: frame.minX, y: superview?.frame.height ?? 0 - abs(y) - frame.height, width: frame.width, height: frame.height)
}
parent.addSubview(self)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
And use it in ViewDidLoad like this.
let _ = MenuButton(parent: view, x: -20, y: 20, width: 40, height: 40)

Answer 3

init() method is called only once when you instantiating your button. You should try to instantiate the button with the desired properties. Try something like this:
let pauseButton = MenuButton(parent: UIView(), x: -20, y: 20, width: 40, height:40)
Then in your viewDidLoad() method you can have just this line:
view.addSubview(pauseButton)
Another problem that I noticed is that you are referencing to the superview in your init() method, but superview is always nil in that case, since your button is not yet added as a subview.

Answer 4

have you tried ?
button.frame = CGRect(x:xPostion, y:yPostion, width:buttonWidth, height:buttonHeight)
or u can declare a funtion called updateFrame in ur Menu button class and pass new position as argument , like this :
func updateFrame(x:CGFloat, y: CGFloat, width: CGFloat, height: CGFloat){
self.frame = CGRect(x:xPostion, y:yPostion, width:buttonWidth, height:buttonHeight)
}
and in your VideDidLoad :
button.updateFrame(x:xPostion, y:yPostion, width:buttonWidth, height:buttonHeight)
what you are doing at the moment is just assigning some values to your Button's properties, how should your button knows to use them to reset its frame ??