Swift - how to move and resize UIImageView programmatically?

Question

iOS

In the View Controller Scene, I have created a UIView on which lies a UIImageView containing an image.
Depending on the screen size of the device, on startup, this ImageView should resize.
(to be precise, it should be square, with a side equal to the width of the screen)
I created a child class MyImageView in which I changed the constructor, adding code that should change the size and position of the object, but it does not change anything at all.

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
        
    var screenWidth = UIScreen.mainScreen().bounds.width
        
    self.bounds = CGRect(origin: CGPoint(x: 0, y: 0), size: CGSize(width: screenWidth, height: screenWidth))
    self.frame = CGRect(origin: CGPoint(x: 0, y: 0), size: CGSize(width: screenWidth, height: screenWidth))
}

I was told that I misunderstood the logic of UIKit. What I do in the code will overwrite what is set in the View Controller Scene. But how then to change the object programmatically?

Answer 1

And you instantiate MyImageView with what method?

Answer 2

In the View Controller Scene, I add an Image View and in the Identity Inspector, in the Custom Class section, I indicate that this is an object of the MyImageView class.