模态视图未正确显示底视图

Question

I am currently presenting a modal with a view at the bottom. Unfortunately, when the modal is displayed, the view controller is pushed down some and cuts off the bottom view found on this controller. Is there a way to calculate how much the view is getting pushed down to move the bottom view a bit higher? Thank you in advance!

I am presenting my modal through a navigation controller:

self.navigationController?.present(vc, animated: true, completion: nil)

On the modal presented view controller, view is added as follows:

    if let b = Bundle.main.loadNibNamed(String.init(format: "%@", "MyView"), owner: self, options: nil) {
        if let addedView = b[0] as? MyViewButton {
            addedView.configureOnScreen(view: self.View)
        }
    }

I am presenting my bottom view inside a custom class that extends UIView:

func configureOnScreen(view: UIView) {
let width = view.frame.width - self.frame.width
let height = view.frame.height - self.frame.height
self.frame = CGRect.init(x: width, y: height, width: self.frame.width, height: self.frame.height)
view.addSubview(self)
}

Answer 1

If you have your constraints setup correctly in your XIB, so they give it a width and a height, you can use auto-layout to position the loaded view.

Based on your code, it looks like you want the view at the bottom-right?

So, forget about your configureOnScreen() func in your MyViewButton class, and instead try it like this:

class PresentMeVC: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        if let b = Bundle.main.loadNibNamed(String.init(format: "%@", "MyView"), owner: self, options: nil) {
            if let addedView = b[0] as? MyViewButton {
                addedView.translatesAutoresizingMaskIntoConstraints = false
                view.addSubview(addedView)

                // respect the safe-area
                let g = view.safeAreaLayoutGuide
                NSLayoutConstraint.activate([
                    addedView.trailingAnchor.constraint(equalTo: g.trailingAnchor),
                    addedView.bottomAnchor.constraint(equalTo: g.bottomAnchor),
                ])
            }
        }
        
    }
    
}