How to change view of my viewController programmatically?

Question

I can change the class of the view in an UIViewController using the Storyboard like so:

How can I achieve the same effect programmatically? I've tried this:

convenience init() {
    print("convenience init")
    self.init(nibName: nil, bundle: nil)
    self.view = MTKView()
}

But it doesn't work. Seems to change the view for the MTKView, but the frame doesn't resize like it does when doing this by the Storyboard.

Answer 1

You should implement the loadView function in your view controller and assign an instance of your custom view to the view controller's view property:

override func loadView() {
    self.view = MyCustomView(frame: ...)
}